fix

compare_nodes.py

@@ -0,0 +1,163 @@
+#!/usr/bin/env python3
+"""Compare YAML node definitions with frontend node-configs."""
+
+import yaml
+import os
+import re
+import json
+
+# 1. Parse YAML files
+yaml_dir = 'src/langbot/templates/metadata/nodes'
+yaml_nodes = {}
+
+for filename in sorted(os.listdir(yaml_dir)):
+    if filename.endswith('.yaml'):
+        filepath = os.path.join(yaml_dir, filename)
+        with open(filepath, 'r') as f:
+            data = yaml.safe_load(f)
+            node_name = data.get('name', filename.replace('.yaml', ''))
+            yaml_nodes[node_name] = {
+                'category': data.get('category', ''),
+                'inputs': [i['name'] for i in data.get('inputs', [])],
+                'outputs': [o['name'] for o in data.get('outputs', [])],
+                'config': [c['name'] for c in data.get('config', [])]
+            }
+
+# 2. Parse frontend node-configs TypeScript files
+node_configs_dir = 'web/src/app/home/workflows/components/workflow-editor/node-configs'
+
+frontend_nodes = {}
+
+def parse_ts_file(filepath):
+    """Parse a TypeScript file to extract node configurations."""
+    with open(filepath, 'r') as f:
+        content = f.read()
+    
+    # Find all node type definitions
+    # Pattern: nodeType: 'xxx'
+    node_type_pattern = r"nodeType:\s*'([^']+)'"
+    node_types = re.findall(node_type_pattern, content)
+    
+    # For each node type, extract inputs, outputs, and config
+    for node_type in node_types:
+        # Find the config object for this node type
+        # Look for the section between this nodeType and the next one or end of object
+        pattern = rf"nodeType:\s*'({re.escape(node_type)})'.*?(?=nodeType:|export\s+(const|function)|$)"
+        match = re.search(pattern, content, re.DOTALL)
+        
+        if match:
+            section = match.group(0)
+            
+            # Extract inputs
+            inputs = re.findall(r"createInput\('([^']+)'", section)
+            
+            # Extract outputs  
+            outputs = re.findall(r"createOutput\('([^']+)'", section)
+            
+            # Extract config names
+            config_names = re.findall(r"name:\s*'([^']+)'", section)
+            # Remove duplicates while preserving order
+            seen = set()
+            unique_config = []
+            for c in config_names:
+                if c not in seen:
+                    seen.add(c)
+                    unique_config.append(c)
+            
+            frontend_nodes[node_type] = {
+                'inputs': inputs,
+                'outputs': outputs,
+                'config': unique_config
+            }
+
+# Parse all config files
+for filename in os.listdir(node_configs_dir):
+    if filename.endswith('.ts') and filename != 'types.ts' and filename != 'index.ts':
+        filepath = os.path.join(node_configs_dir, filename)
+        parse_ts_file(filepath)
+
+# 3. Compare and report differences
+print("=" * 80)
+print("WORKFLOW NODE COMPARISON REPORT: YAML vs Frontend")
+print("=" * 80)
+
+all_node_types = sorted(set(list(yaml_nodes.keys()) + list(frontend_nodes.keys())))
+
+discrepancies = []
+
+for node_type in all_node_types:
+    yaml_def = yaml_nodes.get(node_type)
+    frontend_def = frontend_nodes.get(node_type)
+    
+    node_discrepancies = []
+    
+    if not yaml_def:
+        print(f"\n⚠️  {node_type}: ONLY in frontend (not in YAML)")
+        continue
+    if not frontend_def:
+        print(f"\n⚠️  {node_type}: ONLY in YAML (not in frontend)")
+        continue
+    
+    # Compare inputs
+    yaml_inputs = set(yaml_def['inputs'])
+    frontend_inputs = set(frontend_def['inputs'])
+    if yaml_inputs != frontend_inputs:
+        only_yaml = yaml_inputs - frontend_inputs
+        only_frontend = frontend_inputs - yaml_inputs
+        node_discrepancies.append({
+            'type': 'inputs',
+            'only_yaml': list(only_yaml),
+            'only_frontend': list(only_frontend)
+        })
+    
+    # Compare outputs
+    yaml_outputs = set(yaml_def['outputs'])
+    frontend_outputs = set(frontend_def['outputs'])
+    if yaml_outputs != frontend_outputs:
+        only_yaml = yaml_outputs - frontend_outputs
+        only_frontend = frontend_outputs - yaml_outputs
+        node_discrepancies.append({
+            'type': 'outputs',
+            'only_yaml': list(only_yaml),
+            'only_frontend': list(only_frontend)
+        })
+    
+    # Compare config
+    yaml_config = set(yaml_def['config'])
+    frontend_config = set(frontend_def['config'])
+    if yaml_config != frontend_config:
+        only_yaml = yaml_config - frontend_config
+        only_frontend = frontend_config - yaml_config
+        node_discrepancies.append({
+            'type': 'config',
+            'only_yaml': list(only_yaml),
+            'only_frontend': list(only_frontend)
+        })
+    
+    if node_discrepancies:
+        print(f"\n❌ {node_type} ({yaml_def['category']}): HAS DISCREPANCIES")
+        for d in node_discrepancies:
+            print(f"   {d['type']}:")
+            if d['only_yaml']:
+                print(f"     Only in YAML: {d['only_yaml']}")
+            if d['only_frontend']:
+                print(f"     Only in Frontend: {d['only_frontend']}")
+        discrepancies.append((node_type, node_discrepancies))
+    else:
+        print(f"\n✅ {node_type} ({yaml_def['category']}): OK")
+
+print(f"\n{'=' * 80}")
+print(f"SUMMARY: {len(discrepancies)} nodes with discrepancies out of {len(all_node_types)} total")
+print(f"{'=' * 80}")
+
+# Output as JSON for further processing
+output = {
+    'yaml_nodes': {k: v for k, v in yaml_nodes.items()},
+    'frontend_nodes': {k: v for k, v in frontend_nodes.items()},
+    'discrepancies': {k: v for k, v in discrepancies}
+}
+
+with open('node_comparison.json', 'w') as f:
+    json.dump(output, f, indent=2)
+
+print(f"\nDetailed comparison saved to node_comparison.json")

docs/development/workflow-system.md

@@ -0,0 +1,713 @@
+# Workflow 系统开发者文档
+
+本文档面向 LangBot 开发者，详细介绍 Workflow 系统的技术架构、核心组件和扩展方法。
+
+## 目录
+
+- [系统架构概述](#系统架构概述)
+- [目录结构](#目录结构)
+- [核心组件](#核心组件)
+  - [后端模块](#后端模块)
+  - [前端组件](#前端组件)
+- [数据库表结构](#数据库表结构)
+- [API 接口文档](#api-接口文档)
+- [如何添加新节点类型](#如何添加新节点类型)
+- [调试功能实现](#调试功能实现)
+
+---
+
+## 系统架构概述
+
+Workflow 系统采用前后端分离架构，主要包含以下层次：
+
+```
+┌─────────────────────────────────────────────────────────────┐
+│                      前端层 (React)                          │
+│  ┌─────────────┬──────────────┬──────────────┬───────────┐  │
+│  │ 可视化编辑器 │   节点面板    │   属性面板   │  调试器   │  │
+│  │ ReactFlow   │  NodePalette │ PropertyPanel│ Debugger  │  │
+│  └─────────────┴──────────────┴──────────────┴───────────┘  │
+├─────────────────────────────────────────────────────────────┤
+│                      API 层 (Quart)                          │
+│  ┌─────────────┬──────────────┬──────────────────────────┐  │
+│  │ Workflow API│  Debug API   │     Node Types API       │  │
+│  └─────────────┴──────────────┴──────────────────────────┘  │
+├─────────────────────────────────────────────────────────────┤
+│                     核心引擎层 (Python)                       │
+│  ┌─────────────┬──────────────┬──────────────┬───────────┐  │
+│  │ Executor    │   Registry   │    Node      │ Entities  │  │
+│  │ 执行引擎     │  节点注册表   │   节点基类   │  数据结构  │  │
+│  └─────────────┴──────────────┴──────────────┴───────────┘  │
+├─────────────────────────────────────────────────────────────┤
+│                      存储层 (SQLAlchemy)                     │
+│  ┌─────────────┬──────────────┬──────────────────────────┐  │
+│  │  Workflow   │  Executions  │        Triggers          │  │
+│  └─────────────┴──────────────┴──────────────────────────┘  │
+└─────────────────────────────────────────────────────────────┘
+```
+
+---
+
+## 目录结构
+
+### 后端代码结构
+
+```
+LangBot/src/langbot/pkg/
+├── workflow/                      # Workflow 核心模块
+│   ├── __init__.py               # 模块初始化，导出公共接口
+│   ├── entities.py               # 数据实体定义
+│   ├── executor.py               # 执行引擎
+│   ├── node.py                   # 节点基类和装饰器
+│   ├── registry.py               # 节点类型注册表
+│   └── nodes/                    # 内置节点实现
+│       ├── __init__.py           # 注册所有内置节点
+│       ├── trigger.py            # 触发节点
+│       ├── process.py            # 处理节点
+│       ├── control.py            # 控制节点
+│       └── action.py             # 动作节点
+├── entity/persistence/
+│   └── workflow.py               # 数据库模型
+├── api/http/
+│   ├── controller/groups/workflows/
+│   │   └── workflows.py          # API 路由控制器
+│   └── service/
+│       └── workflow.py           # 业务逻辑服务
+└── persistence/migrations/
+    └── dbm026_workflow_tables.py # 数据库迁移
+```
+
+### 前端代码结构
+
+```
+LangBot/web/src/app/home/workflows/
+├── page.tsx                      # Workflow 列表页
+├── WorkflowDetailContent.tsx     # 详情页内容
+├── store/
+│   └── useWorkflowStore.ts       # Zustand 状态管理
+└── components/
+    ├── workflow-editor/          # 可视化编辑器
+    │   ├── index.ts              # 导出
+    │   ├── WorkflowEditorComponent.tsx  # 主编辑器组件
+    │   ├── WorkflowNodeComponent.tsx    # 自定义节点组件
+    │   ├── NodePalette.tsx       # 节点面板
+    │   ├── PropertyPanel.tsx     # 属性面板
+    │   └── node-configs/         # 节点配置元数据
+    │       ├── types.ts          # 配置类型定义
+    │       ├── trigger-configs.ts
+    │       ├── ai-configs.ts
+    │       ├── process-configs.ts
+    │       ├── control-configs.ts
+    │       ├── action-configs.ts
+    │       ├── integration-configs.ts
+    │       └── index.ts          # 配置汇总
+    ├── workflow-debugger/        # 调试器组件
+    │   ├── index.ts
+    │   └── WorkflowDebugger.tsx
+    ├── workflow-form/            # 表单组件
+    │   └── WorkflowFormComponent.tsx
+    └── workflow-executions/      # 执行历史组件
+        └── WorkflowExecutionsTab.tsx
+```
+
+---
+
+## 核心组件
+
+### 后端模块
+
+#### 1. 执行引擎 (WorkflowExecutor)
+
+位置：[`executor.py`](../../src/langbot/pkg/workflow/executor.py)
+
+执行引擎负责工作流的实际执行，包括：
+
+- **拓扑排序**：确定节点执行顺序
+- **节点执行**：调用各节点的 execute 方法
+- **控制流处理**：处理条件分支、循环、并行执行
+- **错误处理**：支持重试机制
+
+```python
+class WorkflowExecutor:
+    async def execute(
+        self, 
+        workflow: WorkflowDefinition, 
+        context: ExecutionContext,
+        start_node_id: Optional[str] = None
+    ) -> ExecutionContext:
+        """执行工作流"""
+        # 1. 构建执行图
+        # 2. 初始化节点状态
+        # 3. 找到起始节点
+        # 4. 按拓扑顺序执行
+```
+
+**调试执行器 (DebugWorkflowExecutor)**
+
+继承自 WorkflowExecutor，增加了调试支持：
+
+- 断点支持
+- 单步执行
+- 暂停/继续
+- 实时日志
+
+```python
+class DebugWorkflowExecutor(WorkflowExecutor):
+    async def execute_debug(
+        self,
+        workflow: WorkflowDefinition,
+        context: ExecutionContext,
+        debug_state: DebugExecutionState,
+    ) -> ExecutionContext:
+        """调试模式执行"""
+```
+
+#### 2. 节点注册表 (NodeTypeRegistry)
+
+位置：[`registry.py`](../../src/langbot/pkg/workflow/registry.py)
+
+单例模式管理所有节点类型：
+
+```python
+class NodeTypeRegistry:
+    _instance: Optional['NodeTypeRegistry'] = None
+    
+    def register(self, node_type: str, node_class: type[WorkflowNode]):
+        """注册节点类型"""
+        
+    def create_instance(self, node_type: str, node_id: str, config: dict) -> WorkflowNode:
+        """创建节点实例"""
+        
+    def list_all(self) -> list[dict]:
+        """获取所有节点类型的 Schema"""
+```
+
+#### 3. 节点基类 (WorkflowNode)
+
+位置：[`node.py`](../../src/langbot/pkg/workflow/node.py)
+
+所有节点必须继承此基类：
+
+```python
+class WorkflowNode(abc.ABC):
+    # 节点元数据
+    type_name: str = ""
+    name: str = ""
+    description: str = ""
+    category: str = "misc"
+    icon: str = ""
+    
+    # 端口定义
+    inputs: list[NodePort] = []
+    outputs: list[NodePort] = []
+    
+    # 配置 Schema
+    config_schema: list[NodeConfig] = []
+    
+    @abc.abstractmethod
+    async def execute(
+        self, 
+        inputs: dict[str, Any], 
+        context: ExecutionContext
+    ) -> dict[str, Any]:
+        """执行节点逻辑"""
+        pass
+```
+
+#### 4. 数据实体 (entities.py)
+
+主要数据结构：
+
+```python
+class WorkflowDefinition:
+    """工作流定义"""
+    uuid: str
+    name: str
+    nodes: list[NodeDefinition]
+    edges: list[EdgeDefinition]
+    settings: WorkflowSettings
+    
+class ExecutionContext:
+    """执行上下文"""
+    execution_id: str
+    workflow_id: str
+    status: ExecutionStatus
+    variables: dict
+    node_states: dict[str, NodeState]
+    history: list[ExecutionStep]
+```
+
+### 前端组件
+
+#### 1. WorkflowEditorComponent
+
+主编辑器组件，基于 React Flow 实现：
+
+- **画布交互**：拖拽、缩放、平移
+- **节点连接**：自动验证端口类型
+- **撤销/重做**：基于历史记录栈
+- **复制/粘贴**：支持多选复制
+
+关键功能：
+
+```tsx
+function WorkflowEditorInner() {
+  const { nodes, edges, onNodesChange, onEdgesChange, onConnect } = useWorkflowStore();
+  
+  // 拖放添加节点
+  const onDrop = useCallback((event: React.DragEvent) => {
+    const type = event.dataTransfer.getData('application/reactflow');
+    const position = screenToFlowPosition({ x: event.clientX, y: event.clientY });
+    addNode(type, position);
+  }, []);
+  
+  // 复制粘贴
+  const handleCopy = useCallback(() => { ... }, []);
+  const handlePaste = useCallback(() => { ... }, []);
+}
+```
+
+#### 2. NodePalette
+
+节点面板组件，展示可用节点类型：
+
+```tsx
+function NodePalette() {
+  // 按类别组织节点
+  const categories = [
+    { id: 'trigger', name: '触发节点', icon: Zap },
+    { id: 'ai', name: 'AI 节点', icon: Brain },
+    { id: 'process', name: '处理节点', icon: Cpu },
+    { id: 'control', name: '控制节点', icon: GitBranch },
+    { id: 'action', name: '动作节点', icon: Send },
+    { id: 'integration', name: '集成节点', icon: Plug },
+  ];
+  
+  // 拖拽开始
+  const onDragStart = (event: React.DragEvent, nodeType: string) => {
+    event.dataTransfer.setData('application/reactflow', nodeType);
+  };
+}
+```
+
+#### 3. PropertyPanel
+
+属性面板组件，动态渲染节点配置表单：
+
+```tsx
+function PropertyPanel() {
+  const { selectedNodeId, nodes, updateNodeData } = useWorkflowStore();
+  
+  // 根据节点类型获取配置元数据
+  const selectedNode = nodes.find(n => n.id === selectedNodeId);
+  const nodeConfig = getNodeConfig(selectedNode?.data?.nodeType);
+  
+  // 动态渲染配置字段
+  return (
+    <div>
+      {nodeConfig?.fields.map(field => (
+        <ConfigField key={field.name} field={field} />
+      ))}
+    </div>
+  );
+}
+```
+
+#### 4. WorkflowDebugger
+
+调试器组件，支持实时调试：
+
+```tsx
+function WorkflowDebugger({ workflowUuid, workflow }) {
+  const [debugState, setDebugState] = useState<DebugState>('idle');
+  const [executionId, setExecutionId] = useState<string>('');
+  const [logs, setLogs] = useState<ExecutionLog[]>([]);
+  
+  // 启动调试
+  const startDebug = async () => {
+    const result = await backendClient.post(
+      `/api/v1/workflows/${workflowUuid}/debug/start`,
+      { context, variables, breakpoints }
+    );
+    setExecutionId(result.execution_id);
+  };
+  
+  // 轮询状态
+  useEffect(() => {
+    if (debugState === 'running') {
+      const interval = setInterval(fetchState, 500);
+      return () => clearInterval(interval);
+    }
+  }, [debugState]);
+}
+```
+
+#### 5. useWorkflowStore
+
+Zustand 状态管理：
+
+```typescript
+interface WorkflowState {
+  nodes: WorkflowNode[];
+  edges: WorkflowEdge[];
+  selectedNodeId: string | null;
+  history: HistoryEntry[];
+  historyIndex: number;
+  isDirty: boolean;
+  
+  // Actions
+  addNode: (type: string, position: XYPosition) => void;
+  updateNodeData: (nodeId: string, data: Partial<NodeData>) => void;
+  deleteNode: (nodeId: string) => void;
+  undo: () => void;
+  redo: () => void;
+}
+
+export const useWorkflowStore = create<WorkflowState>((set, get) => ({
+  // ... state and actions
+}));
+```
+
+---
+
+## 数据库表结构
+
+### workflows 表
+
+```sql
+CREATE TABLE workflows (
+    uuid VARCHAR(255) PRIMARY KEY,
+    name VARCHAR(255) NOT NULL,
+    description TEXT,
+    emoji VARCHAR(10) DEFAULT '🔄',
+    version INTEGER DEFAULT 1,
+    is_enabled BOOLEAN DEFAULT TRUE,
+    definition JSON NOT NULL,        -- 节点和边定义
+    global_config JSON DEFAULT '{}', -- 全局配置
+    extensions_preferences JSON,     -- 插件和 MCP 配置
+    created_at TIMESTAMP,
+    updated_at TIMESTAMP
+);
+```
+
+### workflow_versions 表
+
+```sql
+CREATE TABLE workflow_versions (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    workflow_uuid VARCHAR(255) NOT NULL,
+    version INTEGER NOT NULL,
+    definition JSON NOT NULL,
+    global_config JSON DEFAULT '{}',
+    created_at TIMESTAMP,
+    created_by VARCHAR(255),
+    UNIQUE(workflow_uuid, version)
+);
+```
+
+### workflow_executions 表
+
+```sql
+CREATE TABLE workflow_executions (
+    uuid VARCHAR(255) PRIMARY KEY,
+    workflow_uuid VARCHAR(255) NOT NULL,
+    workflow_version INTEGER NOT NULL,
+    status VARCHAR(20) NOT NULL,  -- pending/running/completed/failed/cancelled
+    trigger_type VARCHAR(50),
+    trigger_data JSON,
+    variables JSON,
+    start_time TIMESTAMP,
+    end_time TIMESTAMP,
+    error TEXT,
+    created_at TIMESTAMP
+);
+```
+
+### workflow_node_executions 表
+
+```sql
+CREATE TABLE workflow_node_executions (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    execution_uuid VARCHAR(255) NOT NULL,
+    node_id VARCHAR(100) NOT NULL,
+    node_type VARCHAR(50) NOT NULL,
+    status VARCHAR(20) NOT NULL,
+    inputs JSON,
+    outputs JSON,
+    start_time TIMESTAMP,
+    end_time TIMESTAMP,
+    error TEXT,
+    retry_count INTEGER DEFAULT 0
+);
+```
+
+### workflow_triggers 表
+
+```sql
+CREATE TABLE workflow_triggers (
+    uuid VARCHAR(255) PRIMARY KEY,
+    workflow_uuid VARCHAR(255) NOT NULL,
+    type VARCHAR(50) NOT NULL,  -- message/cron/event/webhook
+    config JSON NOT NULL,
+    is_enabled BOOLEAN DEFAULT TRUE,
+    priority INTEGER DEFAULT 0,
+    created_at TIMESTAMP,
+    updated_at TIMESTAMP
+);
+```
+
+---
+
+## API 接口文档
+
+### Workflow CRUD
+
+| 方法 | 路径 | 描述 |
+|-----|------|------|
+| GET | `/api/v1/workflows` | 获取工作流列表 |
+| POST | `/api/v1/workflows` | 创建工作流 |
+| GET | `/api/v1/workflows/:uuid` | 获取单个工作流 |
+| PUT | `/api/v1/workflows/:uuid` | 更新工作流 |
+| DELETE | `/api/v1/workflows/:uuid` | 删除工作流 |
+| POST | `/api/v1/workflows/:uuid/copy` | 复制工作流 |
+
+### 执行相关
+
+| 方法 | 路径 | 描述 |
+|-----|------|------|
+| POST | `/api/v1/workflows/:uuid/execute` | 手动执行工作流 |
+| GET | `/api/v1/workflows/:uuid/executions` | 获取执行记录 |
+
+### 版本管理
+
+| 方法 | 路径 | 描述 |
+|-----|------|------|
+| GET | `/api/v1/workflows/:uuid/versions` | 获取版本列表 |
+| POST | `/api/v1/workflows/:uuid/rollback/:version` | 回滚到指定版本 |
+
+### 调试 API
+
+| 方法 | 路径 | 描述 |
+|-----|------|------|
+| POST | `/api/v1/workflows/:uuid/debug/start` | 启动调试 |
+| POST | `/api/v1/workflows/:uuid/debug/:exec_id/pause` | 暂停执行 |
+| POST | `/api/v1/workflows/:uuid/debug/:exec_id/resume` | 继续执行 |
+| POST | `/api/v1/workflows/:uuid/debug/:exec_id/stop` | 停止执行 |
+| POST | `/api/v1/workflows/:uuid/debug/:exec_id/step` | 单步执行 |
+| GET | `/api/v1/workflows/:uuid/debug/:exec_id/state` | 获取调试状态 |
+
+### 节点类型
+
+| 方法 | 路径 | 描述 |
+|-----|------|------|
+| GET | `/api/v1/workflows/_/node-types` | 获取所有节点类型 |
+| GET | `/api/v1/workflows/_/node-types/categories` | 按类别获取节点类型 |
+
+---
+
+## 如何添加新节点类型
+
+### 步骤 1：创建节点类
+
+在 `LangBot/src/langbot/pkg/workflow/nodes/` 下创建或修改文件：
+
+```python
+from ..node import WorkflowNode, NodePort, NodeConfig, workflow_node
+from ..entities import ExecutionContext
+
+@workflow_node('my_custom_node')
+class MyCustomNode(WorkflowNode):
+    """自定义节点"""
+    
+    # 元数据
+    type_name = 'my_custom_node'
+    name = '我的自定义节点'
+    description = '这是一个自定义节点'
+    category = 'process'  # trigger/process/control/action/integration
+    icon = '🔧'
+    
+    # 输入端口
+    inputs = [
+        NodePort(name='input', type='string', description='输入数据', required=True),
+    ]
+    
+    # 输出端口
+    outputs = [
+        NodePort(name='output', type='string', description='输出数据'),
+    ]
+    
+    # 配置字段
+    config_schema = [
+        NodeConfig(
+            name='option',
+            type='select',
+            required=True,
+            options=['选项A', '选项B'],
+            description='选择一个选项'
+        ),
+        NodeConfig(
+            name='value',
+            type='string',
+            required=False,
+            default='默认值',
+            description='配置值'
+        ),
+    ]
+    
+    async def execute(
+        self, 
+        inputs: dict[str, Any], 
+        context: ExecutionContext
+    ) -> dict[str, Any]:
+        """执行节点逻辑"""
+        input_data = inputs.get('input', '')
+        option = self.get_config('option')
+        value = self.get_config('value', '')
+        
+        # 处理逻辑
+        result = f"处理: {input_data} with {option} and {value}"
+        
+        return {'output': result}
+```
+
+### 步骤 2：注册节点
+
+在 `LangBot/src/langbot/pkg/workflow/nodes/__init__.py` 中导入：
+
+```python
+from .process import (
+    CodeExecutorNode,
+    HttpRequestNode,
+    DataTransformNode,
+    MyCustomNode,  # 添加新节点
+)
+```
+
+### 步骤 3：添加前端配置
+
+在 `LangBot/web/src/app/home/workflows/components/workflow-editor/node-configs/` 目录下添加配置：
+
+```typescript
+// process-configs.ts
+export const processNodeConfigs: NodeConfigMap = {
+  // ... 其他配置
+  
+  my_custom_node: {
+    type: 'my_custom_node',
+    label: 'workflows.nodes.myCustomNode',
+    description: 'workflows.nodes.myCustomNodeDesc',
+    icon: 'Wrench',
+    category: 'process',
+    fields: [
+      {
+        name: 'option',
+        type: 'select',
+        label: 'workflows.fields.option',
+        required: true,
+        options: [
+          { value: '选项A', label: '选项 A' },
+          { value: '选项B', label: '选项 B' },
+        ],
+      },
+      {
+        name: 'value',
+        type: 'string',
+        label: 'workflows.fields.value',
+        required: false,
+        defaultValue: '默认值',
+      },
+    ],
+  },
+};
+```
+
+### 步骤 4：添加国际化
+
+在 `LangBot/web/src/i18n/locales/` 中添加翻译：
+
+```typescript
+// zh-Hans.ts
+workflows: {
+  nodes: {
+    myCustomNode: '我的自定义节点',
+    myCustomNodeDesc: '这是一个自定义节点',
+  },
+  fields: {
+    option: '选项',
+    value: '值',
+  },
+}
+```
+
+---
+
+## 调试功能实现
+
+### 后端调试状态管理
+
+```python
+class DebugExecutionState:
+    """调试执行状态"""
+    
+    def __init__(self, execution_id: str, breakpoints: list[str] = None):
+        self.execution_id = execution_id
+        self.status: str = 'running'
+        self.is_paused: bool = False
+        self.is_stopped: bool = False
+        self.breakpoints: set[str] = set(breakpoints or [])
+        self.logs: list[ExecutionLog] = []
+        self._pause_event = asyncio.Event()
+    
+    def pause(self):
+        """暂停执行"""
+        self.is_paused = True
+        self._pause_event.clear()
+    
+    def resume(self):
+        """继续执行"""
+        self.is_paused = False
+        self._pause_event.set()
+    
+    async def wait_if_paused(self):
+        """如果暂停则等待"""
+        if self.is_paused:
+            await self._pause_event.wait()
+```
+
+### 前端调试流程
+
+1. **设置断点**：点击节点设置断点
+2. **启动调试**：调用 `/debug/start` 启动调试执行
+3. **轮询状态**：定期调用 `/debug/:id/state` 获取状态
+4. **控制执行**：调用 pause/resume/step/stop 控制执行
+5. **查看日志**：实时显示执行日志和节点状态
+
+```typescript
+// 调试状态轮询
+const fetchDebugState = async () => {
+  const state = await backendClient.get(
+    `/api/v1/workflows/${workflowUuid}/debug/${executionId}/state`
+  );
+  
+  // 更新节点状态
+  setNodeStates(state.node_states);
+  
+  // 追加新日志
+  if (state.new_logs.length > 0) {
+    setLogs(prev => [...prev, ...state.new_logs]);
+  }
+  
+  // 检查完成状态
+  if (state.status === 'completed' || state.status === 'error') {
+    setDebugState('idle');
+  }
+};
+```
+
+---
+
+## 扩展阅读
+
+- [Workflow 功能设计文档](../../../plans/langbot-workflow-design.md)
+- [用户使用指南](../user-guide/workflow-guide.md)
+- [API 认证文档](../API_KEY_AUTH.md)

docs/user-guide/workflow-guide.md

@@ -0,0 +1,425 @@
+# Workflow 用户指南
+
+本文档帮助您了解和使用 LangBot 的 Workflow（工作流）功能，通过可视化方式构建自动化的对话处理流程。
+
+## 目录
+
+- [功能介绍](#功能介绍)
+- [快速入门](#快速入门)
+- [节点类型说明](#节点类型说明)
+- [编辑器使用指南](#编辑器使用指南)
+- [调试功能](#调试功能)
+- [常见问题解答](#常见问题解答)
+
+---
+
+## 功能介绍
+
+### 什么是 Workflow？
+
+Workflow（工作流）是 LangBot 提供的可视化自动化编排系统。通过拖拽节点、连接边的方式，您可以：
+
+- 📝 **构建复杂的对话流程**：使用条件分支、循环等控制节点
+- 🤖 **调用 AI 能力**：集成 LLM、知识库检索、参数提取
+- 🔗 **连接外部服务**：集成 Dify、n8n、Coze 等平台
+- ⚡ **自动化任务执行**：消息触发、定时触发、Webhook 触发
+
+### Workflow vs Pipeline
+
+| 对比项 | Pipeline | Workflow |
+|-------|----------|----------|
+| 配置方式 | 表单配置 | 可视化拖拽 |
+| 流程控制 | 线性执行 | 支持分支、循环、并行 |
+| 适用场景 | 简单对话 | 复杂流程 |
+| 学习曲线 | 低 | 中等 |
+
+---
+
+## 快速入门
+
+### 第一步：创建 Workflow
+
+1. 在侧边栏点击 **Workflow** 进入工作流列表
+2. 点击右上角 **创建工作流** 按钮
+3. 填写基本信息：
+   - **名称**：给工作流起一个描述性的名字
+   - **描述**：可选，说明工作流的用途
+   - **图标**：选择一个 emoji 作为标识
+
+### 第二步：添加节点
+
+进入编辑器后，左侧是节点面板，中间是画布区域，右侧是属性面板。
+
+1. **添加触发节点**：从左侧面板拖拽一个"消息触发"节点到画布
+2. **添加 AI 节点**：拖拽一个"LLM 调用"节点
+3. **添加回复节点**：拖拽一个"回复消息"节点
+
+### 第三步：连接节点
+
+1. 将鼠标悬停在触发节点的输出端口（右侧小圆点）
+2. 按住鼠标拖拽到 LLM 节点的输入端口（左侧小圆点）
+3. 同样方式连接 LLM 节点和回复节点
+
+```
+[消息触发] ──▶ [LLM 调用] ──▶ [回复消息]
+```
+
+### 第四步：配置节点
+
+点击 LLM 调用节点，在右侧属性面板配置：
+
+- **运行方式**：选择"本地 Agent"
+- **系统提示词**：描述 AI 的角色和行为
+- **模型**：选择要使用的 LLM 模型
+
+点击回复消息节点配置：
+
+- **消息内容**：设置为 `{{nodes.llm_call.outputs.response}}`（引用 LLM 输出）
+
+### 第五步：保存并绑定
+
+1. 点击工具栏的 **保存** 按钮
+2. 返回 Bot 配置页面
+3. 在 Bot 的绑定设置中选择 **Workflow**，然后选择刚创建的工作流
+
+恭喜！您已经创建了第一个 Workflow。
+
+---
+
+## 节点类型说明
+
+### 触发节点 (Trigger)
+
+触发节点是工作流的入口，定义何时启动执行。
+
+| 节点 | 说明 | 输出 |
+|-----|------|------|
+| 消息触发 | 收到消息时触发 | message, sender_id, platform |
+| 定时触发 | 按 Cron 表达式定时触发 | timestamp |
+| Webhook 触发 | 收到 HTTP 请求时触发 | request_body, headers |
+| 事件触发 | 系统事件触发 | event_type, event_data |
+
+**消息触发配置示例**：
+
+```yaml
+触发条件:
+  - 关键词匹配: ["帮助", "help"]
+  - 平台: ["wechat", "qq"]
+```
+
+### AI 节点
+
+AI 节点用于调用各种 AI 能力。
+
+| 节点 | 说明 | 典型用途 |
+|-----|------|---------|
+| LLM 调用 | 调用大语言模型 | 生成回复、理解意图 |
+| 问题分类器 | 对用户问题分类 | 路由到不同处理分支 |
+| 参数提取器 | 从文本提取结构化数据 | 提取订单号、日期等 |
+| 知识库检索 | 查询知识库 | RAG 增强回复 |
+
+**LLM 调用配置示例**：
+
+```yaml
+运行方式: 本地 Agent
+模型: gpt-4
+系统提示词: |
+  你是一个友好的客服助手。
+  请根据用户的问题提供帮助。
+温度: 0.7
+最大 Token 数: 2000
+```
+
+### 处理节点 (Process)
+
+处理节点用于数据处理和外部调用。
+
+| 节点 | 说明 | 典型用途 |
+|-----|------|---------|
+| 代码执行 | 执行 Python/JavaScript 代码 | 数据处理、格式转换 |
+| HTTP 请求 | 发送 HTTP 请求 | 调用外部 API |
+| 数据转换 | JSON/模板转换 | 数据格式化 |
+
+**HTTP 请求配置示例**：
+
+```yaml
+URL: https://api.example.com/data
+方法: POST
+请求头:
+  Content-Type: application/json
+  Authorization: Bearer {{variables.api_key}}
+请求体: |
+  {"query": "{{message.content}}"}
+```
+
+### 控制节点 (Control)
+
+控制节点用于流程控制。
+
+| 节点 | 说明 | 用途 |
+|-----|------|------|
+| 条件分支 | 二选一分支 | if-else 逻辑 |
+| 多路分支 | 多选一分支 | switch-case 逻辑 |
+| 循环 | 遍历数组 | 批量处理 |
+| 并行 | 同时执行多分支 | 并发处理 |
+| 等待 | 暂停执行 | 延时处理 |
+| 合并 | 合并多个分支 | 汇总结果 |
+
+**条件分支配置示例**：
+
+```yaml
+条件表达式: "{{nodes.classifier.outputs.category}}" == "complaint"
+真分支: 投诉处理
+假分支: 普通咨询
+```
+
+### 动作节点 (Action)
+
+动作节点执行具体操作。
+
+| 节点 | 说明 | 用途 |
+|-----|------|------|
+| 发送消息 | 主动发送消息 | 通知、推送 |
+| 回复消息 | 回复当前消息 | 对话回复 |
+| 存储数据 | 保存数据到存储 | 持久化 |
+| 调用 Pipeline | 调用现有 Pipeline | 复用现有流程 |
+
+**回复消息配置示例**：
+
+```yaml
+消息内容: |
+  感谢您的咨询！
+  
+  {{nodes.llm_call.outputs.response}}
+  
+  如有其他问题，随时联系我。
+```
+
+### 集成节点 (Integration)
+
+集成节点连接外部平台。
+
+| 节点 | 说明 | 平台 |
+|-----|------|------|
+| Dify 工作流 | 调用 Dify 应用 | Dify |
+| Dify 知识库 | 查询 Dify 知识库 | Dify |
+| n8n 工作流 | 调用 n8n 流程 | n8n |
+| Langflow | 调用 Langflow 流程 | Langflow |
+| Coze Bot | 调用扣子 Bot | Coze |
+
+**Dify 工作流配置示例**：
+
+```yaml
+API 地址: https://api.dify.ai/v1
+API Key: sk-xxxxx
+应用类型: workflow
+同步对话历史: true
+```
+
+---
+
+## 编辑器使用指南
+
+### 画布操作
+
+| 操作 | 方式 |
+|-----|------|
+| 平移画布 | 按住鼠标中键/空格+左键 拖拽 |
+| 缩放画布 | 鼠标滚轮 / 工具栏按钮 |
+| 框选多个节点 | 按住 Shift + 拖拽框选 |
+| 适应视图 | 点击工具栏"适应"按钮 |
+
+### 节点操作
+
+| 操作 | 方式 |
+|-----|------|
+| 添加节点 | 从左侧面板拖拽到画布 |
+| 移动节点 | 点击节点拖拽 |
+| 删除节点 | 选中后按 Delete / 点击工具栏删除 |
+| 复制节点 | 选中后 Ctrl+C / 工具栏复制 |
+| 粘贴节点 | Ctrl+V / 工具栏粘贴 |
+
+### 连接操作
+
+| 操作 | 方式 |
+|-----|------|
+| 创建连接 | 从输出端口拖拽到输入端口 |
+| 删除连接 | 点击连接线后按 Delete |
+| 选中连接 | 点击连接线 |
+
+### 快捷键
+
+| 快捷键 | 功能 |
+|-------|------|
+| Ctrl + Z | 撤销 |
+| Ctrl + Shift + Z | 重做 |
+| Ctrl + C | 复制 |
+| Ctrl + V | 粘贴 |
+| Delete | 删除选中 |
+| Ctrl + S | 保存 |
+
+### 工具栏功能
+
+```
+[撤销] [重做] | [放大] [缩小] [适应] | [复制] [粘贴] [删除] | [保存] [调试]
+```
+
+---
+
+## 调试功能
+
+### 启动调试
+
+1. 点击工具栏的 **调试** 按钮
+2. 在调试面板中配置初始数据：
+   - **输入消息**：模拟用户发送的消息
+   - **会话 ID**：可选，用于测试会话变量
+   - **变量**：设置初始变量值
+
+3. 点击 **开始调试** 按钮
+
+### 调试控制
+
+| 按钮 | 功能 |
+|-----|------|
+| ▶️ 开始/继续 | 开始或继续执行 |
+| ⏸️ 暂停 | 暂停执行 |
+| ⏹️ 停止 | 停止执行 |
+| ⏭️ 单步 | 执行下一个节点 |
+
+### 断点
+
+- **设置断点**：点击节点上的断点图标
+- **断点触发**：执行到断点时自动暂停
+- **查看状态**：在暂停时查看节点的输入输出
+
+### 执行日志
+
+调试面板下方显示实时日志：
+
+```
+[INFO] 2024-01-15 10:30:00 - Starting debug execution
+[INFO] 2024-01-15 10:30:00 - Executing node: message_trigger
+[DEBUG] 2024-01-15 10:30:00 - Node inputs: {"message": "你好"}
+[INFO] 2024-01-15 10:30:01 - Node completed in 50ms
+[INFO] 2024-01-15 10:30:01 - Executing node: llm_call
+...
+```
+
+### 节点状态颜色
+
+| 颜色 | 状态 |
+|-----|------|
+| 灰色 | 待执行 |
+| 蓝色 | 执行中 |
+| 绿色 | 已完成 |
+| 红色 | 失败 |
+| 黄色 | 已跳过 |
+
+---
+
+## 常见问题解答
+
+### Q1：如何在节点间传递数据？
+
+使用表达式语法引用其他节点的输出：
+
+```
+{{nodes.节点ID.outputs.输出名称}}
+```
+
+例如：
+- `{{nodes.llm_call.outputs.response}}` - 引用 LLM 节点的响应
+- `{{nodes.http_request.outputs.body}}` - 引用 HTTP 请求的响应体
+
+### Q2：如何使用变量？
+
+Workflow 支持三种变量类型：
+
+1. **工作流变量**：`{{variables.变量名}}`
+2. **会话变量**：`{{conversation_variables.变量名}}`
+3. **消息上下文**：`{{message.content}}`、`{{message.sender_id}}`
+
+### Q3：条件分支如何写条件表达式？
+
+支持以下运算符：
+
+- 比较：`==`, `!=`, `>`, `<`, `>=`, `<=`
+- 逻辑：`and`, `or`, `not`
+- 包含：`in`
+
+示例：
+```python
+# 字符串比较
+"{{nodes.classifier.outputs.intent}}" == "purchase"
+
+# 数值比较
+{{nodes.extractor.outputs.amount}} > 1000
+
+# 包含检查
+"退款" in "{{message.content}}"
+```
+
+### Q4：如何处理错误？
+
+1. **节点级重试**：在节点配置中设置重试次数
+2. **全局错误处理**：在 Workflow 设置中配置错误处理策略
+3. **条件分支**：使用条件节点检查上一节点的状态
+
+### Q5：如何查看执行历史？
+
+1. 进入 Workflow 详情页
+2. 点击 **执行历史** 标签
+3. 查看每次执行的状态、耗时、输入输出
+
+### Q6：Workflow 可以被多个 Bot 使用吗？
+
+是的。一个 Workflow 可以被多个 Bot 绑定使用，但每个 Bot 只能绑定一个处理单元（Pipeline 或 Workflow）。
+
+### Q7：如何复制现有的 Workflow？
+
+在 Workflow 列表页，点击工作流卡片右上角的菜单，选择"复制"即可创建副本。
+
+### Q8：支持版本回滚吗？
+
+支持。每次保存都会创建新版本。在 Workflow 详情页可以查看版本历史并回滚到指定版本。
+
+---
+
+## 最佳实践
+
+### 1. 合理命名
+
+- 为节点和 Workflow 使用描述性名称
+- 使用统一的命名规范
+
+### 2. 模块化设计
+
+- 将复杂流程拆分为多个小 Workflow
+- 使用"调用 Pipeline"节点复用现有流程
+
+### 3. 错误处理
+
+- 为关键节点设置重试机制
+- 使用条件分支处理异常情况
+- 添加日志记录便于排查问题
+
+### 4. 测试先行
+
+- 使用调试功能充分测试
+- 准备多种测试场景
+- 检查边界情况
+
+### 5. 性能优化
+
+- 避免不必要的节点
+- 使用并行节点提高效率
+- 合理设置超时时间
+
+---
+
+## 更多资源
+
+- [开发者文档](../development/workflow-system.md)
+- [设计文档](../../../plans/langbot-workflow-design.md)
+- [API 文档](../service-api-openapi.json)

pyproject.toml

@@ -70,7 +70,7 @@ dependencies = [
     "chromadb>=1.0.0,<2.0.0",
     "qdrant-client (>=1.15.1,<2.0.0)",
     "pyseekdb==1.1.0.post3",
-    "langbot-plugin==0.3.11",
+    "langbot-plugin @ file:///home/typer/Desktop/langbot-plugin-sdk",
     "asyncpg>=0.30.0",
     "line-bot-sdk>=3.19.0",
     "matrix-nio>=0.25.2",

src/langbot/pkg/api/http/controller/groups/workflows/__init__.py

@@ -0,0 +1,5 @@
+# Workflow router group
+from .workflows import WorkflowsRouterGroup, ExecutionsRouterGroup
+from .websocket_chat import WorkflowWebSocketChatRouterGroup
+
+__all__ = ['WorkflowsRouterGroup', 'ExecutionsRouterGroup', 'WorkflowWebSocketChatRouterGroup']

src/langbot/pkg/api/http/controller/groups/workflows/websocket_chat.py

@@ -0,0 +1,260 @@
+"""Workflow WebSocket聊天路由 - 支持工作流调试的双向实时通信"""
+
+import asyncio
+import datetime
+import json
+import logging
+
+import quart
+
+from ... import group
+from ......platform.sources.websocket_manager import ws_connection_manager
+
+logger = logging.getLogger(__name__)
+
+
+@group.group_class('workflow_websocket_chat', '/api/v1/workflows/<workflow_uuid>/ws')
+class WorkflowWebSocketChatRouterGroup(group.RouterGroup):
+    async def initialize(self) -> None:
+        @self.quart_app.websocket(self.path + '/connect')
+        async def workflow_websocket_connect(workflow_uuid: str):
+            """
+            建立工作流WebSocket连接
+
+            URL参数:
+                - workflow_uuid: 工作流UUID
+                - session_type: 会话类型 (person/group)
+            """
+            try:
+                session_type = quart.websocket.args.get('session_type', 'person')
+                logger.info(
+                    'Workflow WebSocket connect request received',
+                    extra={
+                        'workflow_uuid': workflow_uuid,
+                        'session_type': session_type,
+                        'path': quart.websocket.path,
+                        'query_string': quart.websocket.query_string.decode('utf-8', errors='ignore'),
+                        'remote_addr': getattr(quart.websocket, 'remote_addr', None),
+                        'user_agent': quart.websocket.headers.get('User-Agent', ''),
+                        'host': quart.websocket.headers.get('Host', ''),
+                        'origin': quart.websocket.headers.get('Origin', ''),
+                    },
+                )
+
+                if session_type not in ['person', 'group']:
+                    await quart.websocket.send(
+                        json.dumps({'type': 'error', 'message': 'session_type must be person or group'})
+                    )
+                    return
+
+                websocket_adapter = self.ap.platform_mgr.websocket_proxy_bot.adapter
+
+                if not websocket_adapter:
+                    logger.warning(
+                        'Workflow WebSocket adapter missing',
+                        extra={
+                            'workflow_uuid': workflow_uuid,
+                            'session_type': session_type,
+                        },
+                    )
+                    await quart.websocket.send(json.dumps({'type': 'error', 'message': 'WebSocket adapter not found'}))
+                    return
+
+                connection = await ws_connection_manager.add_connection(
+                    websocket=quart.websocket._get_current_object(),
+                    pipeline_uuid=workflow_uuid,
+                    session_type=session_type,
+                    metadata={'user_agent': quart.websocket.headers.get('User-Agent', ''), 'is_workflow': True},
+                )
+
+                await quart.websocket.send(
+                    json.dumps(
+                        {
+                            'type': 'connected',
+                            'connection_id': connection.connection_id,
+                            'workflow_uuid': workflow_uuid,
+                            'session_type': session_type,
+                            'timestamp': connection.created_at.isoformat(),
+                        }
+                    )
+                )
+
+                logger.debug(
+                    f'Workflow WebSocket connection established: {connection.connection_id} '
+                    f'(workflow={workflow_uuid}, session_type={session_type})'
+                )
+
+                receive_task = asyncio.create_task(self._handle_receive(connection, websocket_adapter))
+                send_task = asyncio.create_task(self._handle_send(connection))
+
+                try:
+                    await asyncio.gather(receive_task, send_task)
+                except Exception as e:
+                    logger.error(f'Workflow WebSocket task execution error: {e}')
+                finally:
+                    await ws_connection_manager.remove_connection(connection.connection_id)
+                    logger.debug(f'Workflow WebSocket connection cleaned: {connection.connection_id}')
+
+            except Exception as e:
+                logger.error(
+                    'Workflow WebSocket connection error',
+                    exc_info=True,
+                    extra={
+                        'workflow_uuid': workflow_uuid,
+                        'session_type': quart.websocket.args.get('session_type', 'person'),
+                        'path': quart.websocket.path,
+                        'query_string': quart.websocket.query_string.decode('utf-8', errors='ignore'),
+                        'remote_addr': getattr(quart.websocket, 'remote_addr', None),
+                    },
+                )
+                try:
+                    await quart.websocket.send(json.dumps({'type': 'error', 'message': str(e)}))
+                except Exception as send_error:
+                    logger.debug(
+                        'Failed to send error message to workflow websocket client',
+                        exc_info=True,
+                        extra={
+                            'workflow_uuid': workflow_uuid,
+                            'send_error': str(send_error),
+                        },
+                    )
+
+        @self.route('/messages/<session_type>', methods=['GET'])
+        async def get_messages(workflow_uuid: str, session_type: str) -> str:
+            """获取工作流消息历史"""
+            try:
+                if session_type not in ['person', 'group']:
+                    return self.http_status(400, -1, 'session_type must be person or group')
+
+                websocket_adapter = self.ap.platform_mgr.websocket_proxy_bot.adapter
+
+                if not websocket_adapter:
+                    return self.http_status(404, -1, 'WebSocket adapter not found')
+
+                messages = websocket_adapter.get_websocket_messages(workflow_uuid, session_type)
+
+                return self.success(data={'messages': messages})
+
+            except Exception as e:
+                return self.http_status(500, -1, f'Internal server error: {str(e)}')
+
+        @self.route('/reset/<session_type>', methods=['POST'])
+        async def reset_session(workflow_uuid: str, session_type: str) -> str:
+            """重置工作流会话"""
+            try:
+                if session_type not in ['person', 'group']:
+                    return self.http_status(400, -1, 'session_type must be person or group')
+
+                websocket_adapter = self.ap.platform_mgr.websocket_proxy_bot.adapter
+
+                if not websocket_adapter:
+                    return self.http_status(404, -1, 'WebSocket adapter not found')
+
+                websocket_adapter.reset_session(workflow_uuid, session_type)
+
+                return self.success(data={'message': 'Session reset successfully'})
+
+            except Exception as e:
+                return self.http_status(500, -1, f'Internal server error: {str(e)}')
+
+        @self.route('/connections', methods=['GET'])
+        async def get_connections(workflow_uuid: str) -> str:
+            """获取当前工作流连接统计"""
+            try:
+                stats = ws_connection_manager.get_stats()
+                connections = await ws_connection_manager.get_connections_by_pipeline(workflow_uuid)
+
+                return self.success(
+                    data={
+                        'stats': stats,
+                        'connections': [
+                            {
+                                'connection_id': conn.connection_id,
+                                'session_type': conn.session_type,
+                                'created_at': conn.created_at.isoformat(),
+                                'last_active': conn.last_active.isoformat(),
+                                'is_active': conn.is_active,
+                            }
+                            for conn in connections
+                        ],
+                    }
+                )
+
+            except Exception as e:
+                return self.http_status(500, -1, f'Internal server error: {str(e)}')
+
+        @self.route('/broadcast', methods=['POST'])
+        async def broadcast_message(workflow_uuid: str) -> str:
+            """向所有工作流连接广播消息"""
+            try:
+                data = await quart.request.get_json()
+                message = data.get('message')
+
+                if not message:
+                    return self.http_status(400, -1, 'message is required')
+
+                broadcast_data = {
+                    'type': 'broadcast',
+                    'message': message,
+                    'timestamp': datetime.datetime.now().isoformat(),
+                }
+
+                await ws_connection_manager.broadcast_to_pipeline(workflow_uuid, broadcast_data)
+
+                return self.success(data={'message': 'Broadcast sent successfully'})
+
+            except Exception as e:
+                return self.http_status(500, -1, f'Internal server error: {str(e)}')
+
+    async def _handle_receive(self, connection, websocket_adapter):
+        """处理接收消息的任务"""
+        try:
+            while connection.is_active:
+                message = await quart.websocket.receive()
+
+                await ws_connection_manager.update_activity(connection.connection_id)
+
+                try:
+                    data = json.loads(message)
+                    message_type = data.get('type', 'message')
+
+                    if message_type == 'ping':
+                        await connection.send_queue.put(
+                            {'type': 'pong', 'timestamp': datetime.datetime.now().isoformat()}
+                        )
+
+                    elif message_type == 'message':
+                        logger.debug(f'收到工作流消息: {data} from {connection.connection_id}')
+                        await websocket_adapter.handle_websocket_message(connection, data)
+
+                    elif message_type == 'disconnect':
+                        logger.debug(f'Client disconnected: {connection.connection_id}')
+                        break
+
+                    else:
+                        logger.warning(f'Unknown message type: {message_type}')
+
+                except json.JSONDecodeError:
+                    logger.error(f'Invalid JSON message: {message}')
+                    await connection.send_queue.put({'type': 'error', 'message': 'Invalid JSON format'})
+
+        except Exception as e:
+            logger.error(f'Receive message error: {e}', exc_info=True)
+        finally:
+            connection.is_active = False
+
+    async def _handle_send(self, connection):
+        """处理发送消息的任务"""
+        try:
+            while connection.is_active:
+                try:
+                    message = await asyncio.wait_for(connection.send_queue.get(), timeout=1.0)
+                    await quart.websocket.send(json.dumps(message))
+
+                except asyncio.TimeoutError:
+                    continue
+
+        except Exception as e:
+            logger.error(f'Send message error: {e}', exc_info=True)
+        finally:
+            connection.is_active = False

src/langbot/pkg/api/http/controller/groups/workflows/workflows.py

@@ -0,0 +1,482 @@
+from __future__ import annotations
+
+import quart
+
+from ... import group
+from ....service.workflow import WorkflowExecutionFailedError
+
+
+@group.group_class('workflows', '/api/v1/workflows')
+class WorkflowsRouterGroup(group.RouterGroup):
+    """Workflow API router group"""
+
+    async def initialize(self) -> None:
+        # Workflow CRUD
+        @self.route('', methods=['GET', 'POST'], auth_type=group.AuthType.USER_TOKEN_OR_API_KEY)
+        async def _() -> str:
+            if quart.request.method == 'GET':
+                sort_by = quart.request.args.get('sort_by', 'created_at')
+                sort_order = quart.request.args.get('sort_order', 'DESC')
+                enabled_only = quart.request.args.get('enabled_only', 'false').lower() == 'true'
+                return self.success(
+                    data={'workflows': await self.ap.workflow_service.get_workflows(sort_by, sort_order, enabled_only)}
+                )
+            elif quart.request.method == 'POST':
+                json_data = await quart.request.json
+                workflow_uuid = await self.ap.workflow_service.create_workflow(json_data)
+                return self.success(data={'uuid': workflow_uuid})
+
+        # Get node types (available nodes for the editor)
+        @self.route('/_/node-types', methods=['GET'], auth_type=group.AuthType.USER_TOKEN_OR_API_KEY)
+        async def _() -> str:
+            return self.success(
+                data={
+                    'node_types': await self.ap.workflow_service.get_node_types(),
+                    'categories': await self.ap.workflow_service.get_node_types_by_category_meta(),
+                }
+            )
+
+        # Get node types by category
+        @self.route('/_/node-types/categories', methods=['GET'], auth_type=group.AuthType.USER_TOKEN_OR_API_KEY)
+        async def _() -> str:
+            return self.success(data={'categories': await self.ap.workflow_service.get_node_types_by_category()})
+
+        # Single workflow operations
+        @self.route(
+            '/<workflow_uuid>', methods=['GET', 'PUT', 'DELETE'], auth_type=group.AuthType.USER_TOKEN_OR_API_KEY
+        )
+        async def _(workflow_uuid: str) -> str:
+            if quart.request.method == 'GET':
+                workflow = await self.ap.workflow_service.get_workflow(workflow_uuid)
+                if workflow is None:
+                    return self.http_status(404, -1, 'workflow not found')
+                return self.success(data={'workflow': workflow})
+            elif quart.request.method == 'PUT':
+                json_data = await quart.request.json
+                try:
+                    await self.ap.workflow_service.update_workflow(workflow_uuid, json_data)
+                    return self.success()
+                except ValueError as e:
+                    return self.http_status(404, -1, str(e))
+            elif quart.request.method == 'DELETE':
+                await self.ap.workflow_service.delete_workflow(workflow_uuid)
+                return self.success()
+
+        # Publish workflow (enable)
+        @self.route('/<workflow_uuid>/publish', methods=['POST'], auth_type=group.AuthType.USER_TOKEN_OR_API_KEY)
+        async def _(workflow_uuid: str) -> str:
+            try:
+                await self.ap.workflow_service.publish_workflow(workflow_uuid)
+                return self.success()
+            except ValueError as e:
+                return self.http_status(404, -1, str(e))
+
+        # Unpublish workflow (disable)
+        @self.route('/<workflow_uuid>/unpublish', methods=['POST'], auth_type=group.AuthType.USER_TOKEN_OR_API_KEY)
+        async def _(workflow_uuid: str) -> str:
+            try:
+                await self.ap.workflow_service.unpublish_workflow(workflow_uuid)
+                return self.success()
+            except ValueError as e:
+                return self.http_status(404, -1, str(e))
+
+        # Copy workflow
+        @self.route('/<workflow_uuid>/copy', methods=['POST'], auth_type=group.AuthType.USER_TOKEN_OR_API_KEY)
+        async def _(workflow_uuid: str) -> str:
+            try:
+                new_uuid = await self.ap.workflow_service.copy_workflow(workflow_uuid)
+                return self.success(data={'uuid': new_uuid})
+            except ValueError as e:
+                return self.http_status(404, -1, str(e))
+
+        # Execute workflow manually
+        @self.route('/<workflow_uuid>/execute', methods=['POST'], auth_type=group.AuthType.USER_TOKEN_OR_API_KEY)
+        async def _(workflow_uuid: str) -> str:
+            json_data = await quart.request.json or {}
+            trigger_data = json_data.get('trigger_data', {})
+            session_id = json_data.get('session_id')
+            user_id = json_data.get('user_id')
+            bot_id = json_data.get('bot_id')
+
+            try:
+                execution_id = await self.ap.workflow_service.execute_workflow(
+                    workflow_uuid,
+                    trigger_type='manual',
+                    trigger_data=trigger_data,
+                    session_id=session_id,
+                    user_id=user_id,
+                    bot_id=bot_id,
+                )
+                return self.success(data={'execution_id': execution_id})
+            except ValueError as e:
+                return self.http_status(404, -1, str(e))
+            except WorkflowExecutionFailedError as e:
+                return self.http_status(500, -1, e.message)
+
+        # Get workflow executions
+        @self.route('/<workflow_uuid>/executions', methods=['GET'], auth_type=group.AuthType.USER_TOKEN_OR_API_KEY)
+        async def _(workflow_uuid: str) -> str:
+            limit = int(quart.request.args.get('limit', 50))
+            offset = int(quart.request.args.get('offset', 0))
+            executions = await self.ap.workflow_service.get_executions(
+                workflow_uuid=workflow_uuid, limit=limit, offset=offset
+            )
+            return self.success(data=executions)
+
+        @self.route(
+            '/<workflow_uuid>/executions/<execution_uuid>',
+            methods=['GET'],
+            auth_type=group.AuthType.USER_TOKEN_OR_API_KEY,
+        )
+        async def _(workflow_uuid: str, execution_uuid: str) -> str:
+            execution = await self.ap.workflow_service.get_execution(execution_uuid)
+            if execution is None:
+                return self.http_status(404, -1, 'execution not found')
+            if execution.get('workflow_uuid') != workflow_uuid:
+                return self.http_status(404, -1, 'execution not found in workflow')
+            return self.success(data={'execution': execution})
+
+        # Get workflow versions
+        @self.route('/<workflow_uuid>/versions', methods=['GET'], auth_type=group.AuthType.USER_TOKEN_OR_API_KEY)
+        async def _(workflow_uuid: str) -> str:
+            versions = await self.ap.workflow_service.get_versions(workflow_uuid)
+            return self.success(data={'versions': versions})
+
+        # Rollback to a specific version
+        @self.route(
+            '/<workflow_uuid>/rollback/<int:version>', methods=['POST'], auth_type=group.AuthType.USER_TOKEN_OR_API_KEY
+        )
+        async def _(workflow_uuid: str, version: int) -> str:
+            try:
+                await self.ap.workflow_service.rollback_to_version(workflow_uuid, version)
+                return self.success()
+            except ValueError as e:
+                return self.http_status(404, -1, str(e))
+
+        # Workflow extensions (plugins and MCP servers)
+        @self.route(
+            '/<workflow_uuid>/extensions', methods=['GET', 'PUT'], auth_type=group.AuthType.USER_TOKEN_OR_API_KEY
+        )
+        async def _(workflow_uuid: str) -> str:
+            if quart.request.method == 'GET':
+                workflow = await self.ap.workflow_service.get_workflow(workflow_uuid)
+                if workflow is None:
+                    return self.http_status(404, -1, 'workflow not found')
+
+                # Get available plugins and MCP servers
+                pipeline_component_kinds = ['Command', 'EventListener', 'Tool']
+                plugins = await self.ap.plugin_connector.list_plugins(component_kinds=pipeline_component_kinds)
+                mcp_servers = await self.ap.mcp_service.get_mcp_servers(contain_runtime_info=True)
+
+                extensions_prefs = workflow.get('extensions_preferences', {})
+                return self.success(
+                    data={
+                        'enable_all_plugins': extensions_prefs.get('enable_all_plugins', True),
+                        'enable_all_mcp_servers': extensions_prefs.get('enable_all_mcp_servers', True),
+                        'bound_plugins': extensions_prefs.get('plugins', []),
+                        'available_plugins': plugins,
+                        'bound_mcp_servers': extensions_prefs.get('mcp_servers', []),
+                        'available_mcp_servers': mcp_servers,
+                    }
+                )
+            elif quart.request.method == 'PUT':
+                json_data = await quart.request.json
+                enable_all_plugins = json_data.get('enable_all_plugins', True)
+                enable_all_mcp_servers = json_data.get('enable_all_mcp_servers', True)
+                bound_plugins = json_data.get('bound_plugins', [])
+                bound_mcp_servers = json_data.get('bound_mcp_servers', [])
+
+                try:
+                    await self.ap.workflow_service.update_workflow_extensions(
+                        workflow_uuid, bound_plugins, bound_mcp_servers, enable_all_plugins, enable_all_mcp_servers
+                    )
+                    return self.success()
+                except ValueError as e:
+                    return self.http_status(404, -1, str(e))
+
+        # Debug API - Start debug execution
+        @self.route('/<workflow_uuid>/debug/start', methods=['POST'], auth_type=group.AuthType.USER_TOKEN_OR_API_KEY)
+        async def _(workflow_uuid: str) -> str:
+            json_data = await quart.request.json or {}
+            context = json_data.get('context', {})
+            variables = json_data.get('variables', {})
+            breakpoints = json_data.get('breakpoints', [])
+
+            try:
+                execution_id = await self.ap.workflow_service.start_debug_execution(
+                    workflow_uuid, context=context, variables=variables, breakpoints=breakpoints
+                )
+                return self.success(data={'execution_id': execution_id})
+            except ValueError as e:
+                return self.http_status(404, -1, str(e))
+
+        # Debug API - Pause execution
+        @self.route(
+            '/<workflow_uuid>/debug/<execution_uuid>/pause',
+            methods=['POST'],
+            auth_type=group.AuthType.USER_TOKEN_OR_API_KEY,
+        )
+        async def _(workflow_uuid: str, execution_uuid: str) -> str:
+            try:
+                await self.ap.workflow_service.pause_debug_execution(workflow_uuid, execution_uuid)
+                return self.success()
+            except ValueError as e:
+                return self.http_status(404, -1, str(e))
+
+        # Debug API - Resume execution
+        @self.route(
+            '/<workflow_uuid>/debug/<execution_uuid>/resume',
+            methods=['POST'],
+            auth_type=group.AuthType.USER_TOKEN_OR_API_KEY,
+        )
+        async def _(workflow_uuid: str, execution_uuid: str) -> str:
+            try:
+                await self.ap.workflow_service.resume_debug_execution(workflow_uuid, execution_uuid)
+                return self.success()
+            except ValueError as e:
+                return self.http_status(404, -1, str(e))
+
+        # Debug API - Step execution
+        @self.route(
+            '/<workflow_uuid>/debug/<execution_uuid>/step',
+            methods=['POST'],
+            auth_type=group.AuthType.USER_TOKEN_OR_API_KEY,
+        )
+        async def _(workflow_uuid: str, execution_uuid: str) -> str:
+            try:
+                result = await self.ap.workflow_service.step_debug_execution(workflow_uuid, execution_uuid)
+                return self.success(data=result)
+            except ValueError as e:
+                return self.http_status(404, -1, str(e))
+
+        # Debug API - Stop execution
+        @self.route(
+            '/<workflow_uuid>/debug/<execution_uuid>/stop',
+            methods=['POST'],
+            auth_type=group.AuthType.USER_TOKEN_OR_API_KEY,
+        )
+        async def _(workflow_uuid: str, execution_uuid: str) -> str:
+            try:
+                await self.ap.workflow_service.stop_debug_execution(workflow_uuid, execution_uuid)
+                return self.success()
+            except ValueError as e:
+                return self.http_status(404, -1, str(e))
+
+        # Debug API - Get debug state
+        @self.route(
+            '/<workflow_uuid>/debug/<execution_uuid>/state',
+            methods=['GET'],
+            auth_type=group.AuthType.USER_TOKEN_OR_API_KEY,
+        )
+        async def _(workflow_uuid: str, execution_uuid: str) -> str:
+            try:
+                state = await self.ap.workflow_service.get_debug_state(workflow_uuid, execution_uuid)
+                return self.success(data=state)
+            except ValueError as e:
+                return self.http_status(404, -1, str(e))
+
+        # Get execution logs
+        @self.route(
+            '/<workflow_uuid>/executions/<execution_uuid>/logs',
+            methods=['GET'],
+            auth_type=group.AuthType.USER_TOKEN_OR_API_KEY,
+        )
+        async def _(workflow_uuid: str, execution_uuid: str) -> str:
+            limit = int(quart.request.args.get('limit', 100))
+            offset = int(quart.request.args.get('offset', 0))
+            try:
+                result = await self.ap.workflow_service.get_execution_logs(workflow_uuid, execution_uuid, limit, offset)
+                return self.success(data=result)
+            except ValueError as e:
+                return self.http_status(404, -1, str(e))
+
+        # Rerun execution
+        @self.route(
+            '/<workflow_uuid>/executions/<execution_uuid>/rerun',
+            methods=['POST'],
+            auth_type=group.AuthType.USER_TOKEN_OR_API_KEY,
+        )
+        async def _(workflow_uuid: str, execution_uuid: str) -> str:
+            try:
+                new_execution_id = await self.ap.workflow_service.rerun_execution(workflow_uuid, execution_uuid)
+                return self.success(data={'execution_uuid': new_execution_id})
+            except ValueError as e:
+                return self.http_status(404, -1, str(e))
+
+        # Get workflow statistics
+        @self.route('/<workflow_uuid>/stats', methods=['GET'], auth_type=group.AuthType.USER_TOKEN_OR_API_KEY)
+        async def _(workflow_uuid: str) -> str:
+            try:
+                stats = await self.ap.workflow_service.get_workflow_stats(workflow_uuid)
+                return self.success(data=stats)
+            except ValueError as e:
+                return self.http_status(404, -1, str(e))
+
+        # LLM Node Performance Test Endpoint
+        # Tests each step of LLM node execution with detailed timing
+        @self.route('/_/test/llm-node', methods=['POST'], auth_type=group.AuthType.USER_TOKEN_OR_API_KEY)
+        async def _() -> str:
+            """Test LLM node performance with detailed step-by-step timing.
+            
+            Request body:
+            {
+                "model_uuid": "uuid-of-model",
+                "system_prompt": "optional system prompt",
+                "user_prompt": "test message",
+                "temperature": 0.7,
+                "max_tokens": 100
+            }
+            
+            Response includes timing for each step:
+            - model_fetch: Time to get model from model_mgr
+            - prompt_build: Time to build messages
+            - llm_call: Time for actual LLM invocation
+            - total: Total time
+            - usage: Token usage information
+            """
+            import time
+            
+            json_data = await quart.request.json
+            if not json_data:
+                return self.http_status(400, -1, 'Request body is required')
+            
+            model_uuid = json_data.get('model_uuid', '')
+            if not model_uuid:
+                return self.http_status(400, -1, 'model_uuid is required')
+            
+            user_prompt = json_data.get('user_prompt', 'test')
+            system_prompt = json_data.get('system_prompt', '')
+            temperature = json_data.get('temperature')
+            max_tokens = json_data.get('max_tokens', 0)
+            
+            timings = {}
+            errors = []
+            
+            # Step 1: Model fetch
+            t_start = time.perf_counter()
+            try:
+                runtime_model = await self.ap.model_mgr.get_model_by_uuid(model_uuid)
+                timings['model_fetch_ms'] = round((time.perf_counter() - t_start) * 1000, 2)
+                timings['model_found'] = True
+                timings['model_name'] = runtime_model.model_entity.name if runtime_model else None
+            except Exception as e:
+                timings['model_fetch_ms'] = round((time.perf_counter() - t_start) * 1000, 2)
+                timings['model_found'] = False
+                errors.append(f'Model fetch failed: {str(e)}')
+                return self.http_status(400, -1, {
+                    'error': errors[0],
+                    'timings': timings,
+                })
+            
+            # Step 2: Build messages
+            t_start = time.perf_counter()
+            import langbot_plugin.api.entities.builtin.provider.message as provider_message
+            messages = []
+            if system_prompt:
+                messages.append(provider_message.Message(role='system', content=system_prompt))
+            messages.append(provider_message.Message(role='user', content=user_prompt))
+            timings['prompt_build_ms'] = round((time.perf_counter() - t_start) * 1000, 2)
+            
+            # Step 3: Build extra args
+            extra_args = {}
+            if temperature is not None:
+                extra_args['temperature'] = float(temperature)
+            if max_tokens and int(max_tokens) > 0:
+                extra_args['max_tokens'] = int(max_tokens)
+            
+            # Step 4: LLM call
+            t_start = time.perf_counter()
+            try:
+                result_message = await runtime_model.provider.invoke_llm(
+                    query=None,
+                    model=runtime_model,
+                    messages=messages,
+                    funcs=None,
+                    extra_args=extra_args,
+                )
+                timings['llm_call_ms'] = round((time.perf_counter() - t_start) * 1000, 2)
+                timings['llm_call_success'] = True
+                
+                # Extract response text
+                response_text = ''
+                if isinstance(result_message.content, str):
+                    response_text = result_message.content
+                elif isinstance(result_message.content, list):
+                    for elem in result_message.content:
+                        if hasattr(elem, 'text') and elem.text:
+                            response_text += elem.text
+                        elif isinstance(elem, str):
+                            response_text += elem
+                
+                timings['response_length'] = len(response_text)
+                timings['response_preview'] = response_text[:200]
+                
+                # Extract usage
+                usage = {'prompt_tokens': 0, 'completion_tokens': 0, 'total_tokens': 0}
+                if hasattr(result_message, 'usage') and result_message.usage:
+                    u = result_message.usage
+                    usage = {
+                        'prompt_tokens': getattr(u, 'prompt_tokens', 0) or 0,
+                        'completion_tokens': getattr(u, 'completion_tokens', 0) or 0,
+                        'total_tokens': getattr(u, 'total_tokens', 0) or 0,
+                    }
+                timings['usage'] = usage
+                
+            except Exception as e:
+                timings['llm_call_ms'] = round((time.perf_counter() - t_start) * 1000, 2)
+                timings['llm_call_success'] = False
+                errors.append(f'LLM call failed: {str(e)}')
+            
+            # Calculate total
+            timings['total_ms'] = round(sum([
+                timings.get('model_fetch_ms', 0),
+                timings.get('prompt_build_ms', 0),
+                timings.get('llm_call_ms', 0),
+            ]), 2)
+            
+            # Add breakdown percentage
+            if timings['total_ms'] > 0:
+                timings['breakdown'] = {
+                    'model_fetch_pct': round(timings.get('model_fetch_ms', 0) / timings['total_ms'] * 100, 1),
+                    'prompt_build_pct': round(timings.get('prompt_build_ms', 0) / timings['total_ms'] * 100, 1),
+                    'llm_call_pct': round(timings.get('llm_call_ms', 0) / timings['total_ms'] * 100, 1),
+                }
+            
+            if errors:
+                timings['errors'] = errors
+            
+            return self.success(data={'test_result': timings})
+
+
+@group.group_class('executions', '/api/v1/executions')
+class ExecutionsRouterGroup(group.RouterGroup):
+    """Workflow execution API router group"""
+
+    async def initialize(self) -> None:
+        # Get all executions (across all workflows)
+        @self.route('', methods=['GET'], auth_type=group.AuthType.USER_TOKEN_OR_API_KEY)
+        async def _() -> str:
+            limit = int(quart.request.args.get('limit', 50))
+            offset = int(quart.request.args.get('offset', 0))
+            status = quart.request.args.get('status')
+            executions = await self.ap.workflow_service.get_executions(limit=limit, offset=offset, status=status)
+            return self.success(data=executions)
+
+        # Get single execution
+        @self.route('/<execution_uuid>', methods=['GET'], auth_type=group.AuthType.USER_TOKEN_OR_API_KEY)
+        async def _(execution_uuid: str) -> str:
+            execution = await self.ap.workflow_service.get_execution(execution_uuid)
+            if execution is None:
+                return self.http_status(404, -1, 'execution not found')
+            return self.success(data={'execution': execution})
+
+        # Cancel execution
+        @self.route('/<execution_uuid>/cancel', methods=['POST'], auth_type=group.AuthType.USER_TOKEN_OR_API_KEY)
+        async def _(execution_uuid: str) -> str:
+            try:
+                await self.ap.workflow_service.cancel_execution(execution_uuid)
+                return self.success()
+            except ValueError as e:
+                return self.http_status(404, -1, str(e))
+            except RuntimeError as e:
+                return self.http_status(400, -1, str(e))

src/langbot/pkg/api/http/controller/main.py

@@ -17,6 +17,7 @@ from .groups import platform as groups_platform
 from .groups import pipelines as groups_pipelines
 from .groups import knowledge as groups_knowledge
 from .groups import resources as groups_resources
+from .groups import workflows as groups_workflows
 
 importutil.import_modules_in_pkg(groups)
 importutil.import_modules_in_pkg(groups_provider)
@@ -24,6 +25,7 @@ importutil.import_modules_in_pkg(groups_platform)
 importutil.import_modules_in_pkg(groups_pipelines)
 importutil.import_modules_in_pkg(groups_knowledge)
 importutil.import_modules_in_pkg(groups_resources)
+importutil.import_modules_in_pkg(groups_workflows)
 
 
 class HTTPController:

src/langbot/pkg/api/http/service/bot.py

@@ -99,16 +99,23 @@ class BotService:
         # TODO: 检查配置信息格式
         bot_data['uuid'] = str(uuid.uuid4())
 
-        # bind the most recently updated pipeline if any exist
+        # Set default binding_type if not provided
+        if 'binding_type' not in bot_data:
+            bot_data['binding_type'] = 'pipeline'
+
+        # checkout the default pipeline (for backward compatibility)
         result = await self.ap.persistence_mgr.execute_async(
-            sqlalchemy.select(persistence_pipeline.LegacyPipeline)
-            .order_by(persistence_pipeline.LegacyPipeline.updated_at.desc())
-            .limit(1)
+            sqlalchemy.select(persistence_pipeline.LegacyPipeline).where(
+                persistence_pipeline.LegacyPipeline.is_default == True
+            )
         )
         pipeline = result.first()
         if pipeline is not None:
             bot_data['use_pipeline_uuid'] = pipeline.uuid
             bot_data['use_pipeline_name'] = pipeline.name
+            # Also set binding_uuid for new unified binding model
+            if 'binding_uuid' not in bot_data:
+                bot_data['binding_uuid'] = pipeline.uuid
 
         await self.ap.persistence_mgr.execute_async(sqlalchemy.insert(persistence_bot.Bot).values(bot_data))
 
@@ -120,26 +127,38 @@ class BotService:
 
     async def update_bot(self, bot_uuid: str, bot_data: dict) -> None:
         """Update bot"""
-        update_data = bot_data.copy()
+        if 'uuid' in bot_data:
+            del bot_data['uuid']
 
-        if 'uuid' in update_data:
-            del update_data['uuid']
+        # Handle binding_type and binding_uuid for the new unified binding model
+        # If binding_type is explicitly set to 'workflow', skip pipeline validation
+        binding_type = bot_data.get('binding_type')
 
-        # set use_pipeline_name
-        if 'use_pipeline_uuid' in update_data:
+        # set use_pipeline_name (for backward compatibility with 'pipeline' binding_type)
+        if 'use_pipeline_uuid' in bot_data:
             result = await self.ap.persistence_mgr.execute_async(
                 sqlalchemy.select(persistence_pipeline.LegacyPipeline).where(
-                    persistence_pipeline.LegacyPipeline.uuid == update_data['use_pipeline_uuid']
+                    persistence_pipeline.LegacyPipeline.uuid == bot_data['use_pipeline_uuid']
                 )
             )
             pipeline = result.first()
             if pipeline is not None:
-                update_data['use_pipeline_name'] = pipeline.name
+                bot_data['use_pipeline_name'] = pipeline.name
+                # Also sync to binding_uuid if binding_type is 'pipeline' or not set
+                if binding_type is None or binding_type == 'pipeline':
+                    bot_data['binding_uuid'] = bot_data['use_pipeline_uuid']
+                    bot_data['binding_type'] = 'pipeline'
             else:
                 raise Exception('Pipeline not found')
 
+        # If binding_uuid is set directly (for workflow), sync use_pipeline_uuid for backward compatibility
+        if 'binding_uuid' in bot_data and binding_type == 'workflow':
+            # For workflow binding, we don't sync to use_pipeline_uuid
+            # but we ensure binding_type is correctly set
+            bot_data['binding_type'] = 'workflow'
+
         await self.ap.persistence_mgr.execute_async(
-            sqlalchemy.update(persistence_bot.Bot).values(update_data).where(persistence_bot.Bot.uuid == bot_uuid)
+            sqlalchemy.update(persistence_bot.Bot).values(bot_data).where(persistence_bot.Bot.uuid == bot_uuid)
         )
         await self.ap.platform_mgr.remove_bot(bot_uuid)
 

src/langbot/pkg/api/http/service/pipeline.py

@@ -73,6 +73,20 @@ class PipelineService:
 
         return self.ap.persistence_mgr.serialize_model(persistence_pipeline.LegacyPipeline, pipeline)
 
+    async def get_pipeline_by_name(self, pipeline_name: str) -> dict | None:
+        result = await self.ap.persistence_mgr.execute_async(
+            sqlalchemy.select(persistence_pipeline.LegacyPipeline).where(
+                persistence_pipeline.LegacyPipeline.name == pipeline_name
+            )
+        )
+
+        pipeline = result.first()
+
+        if pipeline is None:
+            return None
+
+        return self.ap.persistence_mgr.serialize_model(persistence_pipeline.LegacyPipeline, pipeline)
+
     async def create_pipeline(self, pipeline_data: dict, default: bool = False) -> str:
         from ....utils import paths as path_utils
 

src/langbot/pkg/core/app.py

@@ -31,6 +31,7 @@ from ..api.http.service import mcp as mcp_service
 from ..api.http.service import apikey as apikey_service
 from ..api.http.service import webhook as webhook_service
 from ..api.http.service import monitoring as monitoring_service
+from ..api.http.service import workflow as workflow_service
 from ..api.http.service import maintenance as maintenance_service
 
 from ..discover import engine as discover_engine
@@ -150,6 +151,8 @@ class Application:
 
     webhook_service: webhook_service.WebhookService = None
 
+    workflow_service: workflow_service.WorkflowService = None
+
     telemetry: telemetry_module.TelemetryManager = None
 
     survey: survey_module.SurveyManager = None
@@ -237,6 +240,22 @@ class Application:
                     scopes=[core_entities.LifecycleControlScope.APPLICATION],
                 )
 
+            async def workflow_execution_cleanup_loop():
+                check_interval_seconds = 60
+                while True:
+                    try:
+                        cancelled = await self.workflow_service.cleanup_stale_executions()
+                        if cancelled > 0:
+                            self.logger.info(f'Workflow execution auto-cleanup: cancelled {cancelled} stale executions')
+                    except Exception as e:
+                        self.logger.warning(f'Workflow execution auto-cleanup error: {e}')
+                    await asyncio.sleep(check_interval_seconds)
+
+            self.task_mgr.create_task(
+                workflow_execution_cleanup_loop(),
+                name='workflow-execution-cleanup',
+                scopes=[core_entities.LifecycleControlScope.APPLICATION],
+            )
             # Start storage/log maintenance task if enabled
             storage_cleanup_cfg = self.instance_config.data.get('storage', {}).get('cleanup', {})
             if storage_cleanup_cfg.get('enabled', True) and self.maintenance_service is not None:

src/langbot/pkg/core/stages/build_app.py

@@ -28,6 +28,7 @@ from ...api.http.service import mcp as mcp_service
 from ...api.http.service import apikey as apikey_service
 from ...api.http.service import webhook as webhook_service
 from ...api.http.service import monitoring as monitoring_service
+from ...api.http.service import workflow as workflow_service
 from ...api.http.service import maintenance as maintenance_service
 from ...discover import engine as discover_engine
 from ...storage import mgr as storagemgr
@@ -86,6 +87,9 @@ class BuildAppStage(stage.BootingStage):
         webhook_service_inst = webhook_service.WebhookService(ap)
         ap.webhook_service = webhook_service_inst
 
+        workflow_service_inst = workflow_service.WorkflowService(ap)
+        ap.workflow_service = workflow_service_inst
+
         proxy_mgr = proxy.ProxyManager(ap)
         await proxy_mgr.initialize()
         ap.proxy_mgr = proxy_mgr

src/langbot/pkg/core/stages/load_config.py

@@ -221,3 +221,34 @@ class LoadConfigStage(stage.BootingStage):
         ap.pipeline_config_meta_safety = await load_resource_yaml_template_data('metadata/pipeline/safety.yaml')
         ap.pipeline_config_meta_ai = await load_resource_yaml_template_data('metadata/pipeline/ai.yaml')
         ap.pipeline_config_meta_output = await load_resource_yaml_template_data('metadata/pipeline/output.yaml')
+
+        # Load workflow node metadata from YAML files. YAML is the source of
+        # truth for workflow editor metadata; Python classes provide execution
+        # logic and are bound through the registry.
+        from langbot.pkg.workflow.metadata import NodeMetadataLoader
+        from langbot.pkg.workflow.registry import NodeTypeRegistry
+
+        workflow_metadata_loader = NodeMetadataLoader()
+        workflow_node_count = await workflow_metadata_loader.load_core_metadata()
+        ap.workflow_node_configs = workflow_metadata_loader.get_all_metadata()
+        ap.workflow_node_metadata_loader = workflow_metadata_loader
+
+        workflow_registry = NodeTypeRegistry.instance()
+        for node_config in ap.workflow_node_configs.values():
+            workflow_registry.register_metadata(node_config, source=node_config.get('_source', 'core'))
+
+        # Auto-discover and register workflow nodes using discovery engine
+        if hasattr(ap, 'discover') and ap.discover is not None:
+            workflow_registry.discover_nodes(ap.discover)
+
+        workflow_load_errors = workflow_metadata_loader.get_load_errors()
+        if workflow_load_errors:
+            print(f'Workflow node metadata load errors: {len(workflow_load_errors)}')
+            for error in workflow_load_errors:
+                print(f"  - {error.get('file')}: {error.get('error')}")
+
+        print(
+            f'Loaded {workflow_node_count} workflow node metadata files; '
+            f'registered {workflow_registry.metadata_count()} metadata definitions, '
+            f'{workflow_registry.count()} node types'
+        )

src/langbot/pkg/discover/engine.py

@@ -304,3 +304,65 @@ class ComponentDiscoveryEngine:
             if component.kind == kind:
                 result.append(component)
         return result
+
+    def discover_workflow_nodes(self, nodes_dir: str) -> typing.List[typing.Type]:
+        """Discover workflow node classes from a directory of Python modules.
+        
+        Scans all .py files in the given directory, imports them, and collects
+        classes that are subclasses of WorkflowNode.
+        
+        Args:
+            nodes_dir: Directory path like 'pkg/workflow/nodes/'
+            
+        Returns:
+            List of WorkflowNode subclasses found
+        """
+        from langbot.pkg.workflow.node import WorkflowNode
+        
+        node_classes: typing.List[typing.Type[WorkflowNode]] = []
+        
+        # Normalize path
+        if nodes_dir.endswith('/'):
+            nodes_dir = nodes_dir[:-1]
+        
+        # Import the nodes package to trigger all module imports
+        module_path = nodes_dir.replace('/', '.').replace('\\', '.')
+        package_path = module_path
+        
+        try:
+            # Import the package __init__ to trigger submodule imports
+            importlib.import_module(f'langbot.{package_path}')
+        except ImportError:
+            self.ap.logger.warning(f'Failed to import workflow nodes package: langbot.{package_path}')
+        
+        # Since workflow/__init__.py is empty, explicitly import all .py files in the nodes directory
+        import os
+        # engine.py is in langbot/pkg/discover/, nodes are in langbot/pkg/workflow/nodes/
+        nodes_abs_path = os.path.abspath(os.path.join(os.path.dirname(__file__), '..', 'workflow', 'nodes'))
+        if os.path.isdir(nodes_abs_path):
+            for filename in os.listdir(nodes_abs_path):
+                if filename.endswith('.py') and not filename.startswith('_'):
+                    module_name = filename[:-3]
+                    try:
+                        importlib.import_module(f'langbot.{package_path}.{module_name}')
+                    except ImportError as e:
+                        self.ap.logger.warning(f'Failed to import workflow node module: {module_name}: {e}')
+        
+        # Now collect all WorkflowNode subclasses from sys.modules
+        import sys
+        prefix = f'langbot.{package_path}.'
+        for mod_name, mod in sys.modules.items():
+            if mod_name.startswith(prefix) and mod is not None:
+                for attr_name in dir(mod):
+                    attr = getattr(mod, attr_name)
+                    if (
+                        isinstance(attr, type)
+                        and issubclass(attr, WorkflowNode)
+                        and attr is not WorkflowNode
+                        and hasattr(attr, 'type_name')
+                        and attr.type_name
+                    ):
+                        if attr not in node_classes:
+                            node_classes.append(attr)
+        
+        return node_classes

src/langbot/pkg/entity/persistence/bot.py

@@ -17,6 +17,13 @@ class Bot(Base):
     use_pipeline_name = sqlalchemy.Column(sqlalchemy.String(255), nullable=True)
     use_pipeline_uuid = sqlalchemy.Column(sqlalchemy.String(255), nullable=True)
     pipeline_routing_rules = sqlalchemy.Column(sqlalchemy.JSON, nullable=False, server_default='[]')
+
+    # New unified binding fields
+    # binding_type: 'pipeline' or 'workflow'
+    binding_type = sqlalchemy.Column(sqlalchemy.String(32), nullable=False, server_default='pipeline')
+    # binding_uuid: UUID of the bound Pipeline or Workflow
+    binding_uuid = sqlalchemy.Column(sqlalchemy.String(64), nullable=True)
+
     created_at = sqlalchemy.Column(sqlalchemy.DateTime, nullable=False, server_default=sqlalchemy.func.now())
     updated_at = sqlalchemy.Column(
         sqlalchemy.DateTime,

src/langbot/pkg/entity/persistence/workflow.py

@@ -0,0 +1,126 @@
+"""Workflow persistence entities"""
+
+import sqlalchemy
+
+from .base import Base
+
+
+class Workflow(Base):
+    """Workflow definition"""
+
+    __tablename__ = 'workflows'
+
+    uuid = sqlalchemy.Column(sqlalchemy.String(255), primary_key=True, unique=True)
+    name = sqlalchemy.Column(sqlalchemy.String(255), nullable=False)
+    description = sqlalchemy.Column(sqlalchemy.Text, nullable=True)
+    emoji = sqlalchemy.Column(sqlalchemy.String(10), nullable=True, default='🔄')
+    version = sqlalchemy.Column(sqlalchemy.Integer, nullable=False, default=1)
+    is_enabled = sqlalchemy.Column(sqlalchemy.Boolean, nullable=False, default=True)
+
+    # Workflow definition stored as JSON
+    # Contains: nodes, edges, variables, settings
+    definition = sqlalchemy.Column(sqlalchemy.JSON, nullable=False, default={})
+
+    # Global config (inherited from Pipeline capabilities)
+    # Contains: safety, output configs
+    global_config = sqlalchemy.Column(sqlalchemy.JSON, nullable=False, default={})
+
+    # Extensions preferences (same as Pipeline)
+    extensions_preferences = sqlalchemy.Column(
+        sqlalchemy.JSON,
+        nullable=False,
+        default={'enable_all_plugins': True, 'enable_all_mcp_servers': True, 'plugins': [], 'mcp_servers': []},
+    )
+
+    created_at = sqlalchemy.Column(sqlalchemy.DateTime, nullable=False, server_default=sqlalchemy.func.now())
+    updated_at = sqlalchemy.Column(
+        sqlalchemy.DateTime,
+        nullable=False,
+        server_default=sqlalchemy.func.now(),
+        onupdate=sqlalchemy.func.now(),
+    )
+
+
+class WorkflowVersion(Base):
+    """Workflow version history"""
+
+    __tablename__ = 'workflow_versions'
+
+    id = sqlalchemy.Column(sqlalchemy.Integer, primary_key=True, autoincrement=True)
+    workflow_uuid = sqlalchemy.Column(sqlalchemy.String(255), nullable=False, index=True)
+    version = sqlalchemy.Column(sqlalchemy.Integer, nullable=False)
+    definition = sqlalchemy.Column(sqlalchemy.JSON, nullable=False)
+    global_config = sqlalchemy.Column(sqlalchemy.JSON, nullable=False, default={})
+    created_at = sqlalchemy.Column(sqlalchemy.DateTime, nullable=False, server_default=sqlalchemy.func.now())
+    created_by = sqlalchemy.Column(sqlalchemy.String(255), nullable=True)
+
+    __table_args__ = (sqlalchemy.UniqueConstraint('workflow_uuid', 'version', name='uq_workflow_version'),)
+
+
+class WorkflowTrigger(Base):
+    """Workflow trigger configuration"""
+
+    __tablename__ = 'workflow_triggers'
+
+    uuid = sqlalchemy.Column(sqlalchemy.String(255), primary_key=True, unique=True)
+    workflow_uuid = sqlalchemy.Column(sqlalchemy.String(255), nullable=False, index=True)
+    type = sqlalchemy.Column(sqlalchemy.String(50), nullable=False)  # message, cron, event, webhook
+    config = sqlalchemy.Column(sqlalchemy.JSON, nullable=False, default={})
+    is_enabled = sqlalchemy.Column(sqlalchemy.Boolean, nullable=False, default=True)
+    priority = sqlalchemy.Column(sqlalchemy.Integer, nullable=False, default=0)
+    created_at = sqlalchemy.Column(sqlalchemy.DateTime, nullable=False, server_default=sqlalchemy.func.now())
+    updated_at = sqlalchemy.Column(
+        sqlalchemy.DateTime,
+        nullable=False,
+        server_default=sqlalchemy.func.now(),
+        onupdate=sqlalchemy.func.now(),
+    )
+
+
+class WorkflowExecution(Base):
+    """Workflow execution record"""
+
+    __tablename__ = 'workflow_executions'
+
+    uuid = sqlalchemy.Column(sqlalchemy.String(255), primary_key=True, unique=True)
+    workflow_uuid = sqlalchemy.Column(sqlalchemy.String(255), nullable=False, index=True)
+    workflow_version = sqlalchemy.Column(sqlalchemy.Integer, nullable=False)
+    status = sqlalchemy.Column(sqlalchemy.String(20), nullable=False)  # pending, running, completed, failed, cancelled
+    trigger_type = sqlalchemy.Column(sqlalchemy.String(50), nullable=True)
+    trigger_data = sqlalchemy.Column(sqlalchemy.JSON, nullable=True)
+    variables = sqlalchemy.Column(sqlalchemy.JSON, nullable=True)
+    start_time = sqlalchemy.Column(sqlalchemy.DateTime, nullable=True)
+    end_time = sqlalchemy.Column(sqlalchemy.DateTime, nullable=True)
+    error = sqlalchemy.Column(sqlalchemy.Text, nullable=True)
+    created_at = sqlalchemy.Column(sqlalchemy.DateTime, nullable=False, server_default=sqlalchemy.func.now())
+
+
+class WorkflowNodeExecution(Base):
+    """Workflow node execution record"""
+
+    __tablename__ = 'workflow_node_executions'
+
+    id = sqlalchemy.Column(sqlalchemy.Integer, primary_key=True, autoincrement=True)
+    execution_uuid = sqlalchemy.Column(sqlalchemy.String(255), nullable=False, index=True)
+    node_id = sqlalchemy.Column(sqlalchemy.String(100), nullable=False)
+    node_type = sqlalchemy.Column(sqlalchemy.String(50), nullable=False)
+    status = sqlalchemy.Column(sqlalchemy.String(20), nullable=False)  # pending, running, completed, failed, skipped
+    inputs = sqlalchemy.Column(sqlalchemy.JSON, nullable=True)
+    outputs = sqlalchemy.Column(sqlalchemy.JSON, nullable=True)
+    start_time = sqlalchemy.Column(sqlalchemy.DateTime, nullable=True)
+    end_time = sqlalchemy.Column(sqlalchemy.DateTime, nullable=True)
+    error = sqlalchemy.Column(sqlalchemy.Text, nullable=True)
+    retry_count = sqlalchemy.Column(sqlalchemy.Integer, nullable=False, default=0)
+
+
+class ScheduledJob(Base):
+    """Scheduled job for cron triggers"""
+
+    __tablename__ = 'workflow_scheduled_jobs'
+
+    uuid = sqlalchemy.Column(sqlalchemy.String(255), primary_key=True, unique=True)
+    trigger_uuid = sqlalchemy.Column(sqlalchemy.String(255), nullable=False, index=True)
+    cron_expression = sqlalchemy.Column(sqlalchemy.String(100), nullable=True)
+    next_run_time = sqlalchemy.Column(sqlalchemy.DateTime, nullable=True)
+    last_run_time = sqlalchemy.Column(sqlalchemy.DateTime, nullable=True)
+    is_enabled = sqlalchemy.Column(sqlalchemy.Boolean, nullable=False, default=True)

src/langbot/pkg/persistence/migrations/dbm026_workflow_tables.py

@@ -0,0 +1,158 @@
+"""Add workflow tables and update bot binding fields"""
+
+import sqlalchemy
+from .. import migration
+
+
+@migration.migration_class(26)
+class DBMigrateWorkflowTables(migration.DBMigration):
+    """Add workflow tables and update bot binding fields"""
+
+    async def upgrade(self):
+        # Create workflows table
+        await self.ap.persistence_mgr.execute_async(
+            sqlalchemy.text("""
+            CREATE TABLE IF NOT EXISTS workflows (
+                uuid VARCHAR(255) PRIMARY KEY,
+                name VARCHAR(255) NOT NULL,
+                description TEXT,
+                emoji VARCHAR(10) DEFAULT '🔄',
+                version INTEGER NOT NULL DEFAULT 1,
+                is_enabled BOOLEAN NOT NULL DEFAULT 1,
+                definition JSON NOT NULL DEFAULT '{}',
+                global_config JSON NOT NULL DEFAULT '{}',
+                extensions_preferences JSON NOT NULL DEFAULT '{"enable_all_plugins": true, "enable_all_mcp_servers": true, "plugins": [], "mcp_servers": []}',
+                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+                updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+            )
+        """)
+        )
+
+        # Create workflow_versions table
+        await self.ap.persistence_mgr.execute_async(
+            sqlalchemy.text("""
+            CREATE TABLE IF NOT EXISTS workflow_versions (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                workflow_uuid VARCHAR(255) NOT NULL,
+                version INTEGER NOT NULL,
+                definition JSON NOT NULL,
+                global_config JSON NOT NULL DEFAULT '{}',
+                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+                created_by VARCHAR(255),
+                UNIQUE(workflow_uuid, version)
+            )
+        """)
+        )
+
+        # Create workflow_triggers table
+        await self.ap.persistence_mgr.execute_async(
+            sqlalchemy.text("""
+            CREATE TABLE IF NOT EXISTS workflow_triggers (
+                uuid VARCHAR(255) PRIMARY KEY,
+                workflow_uuid VARCHAR(255) NOT NULL,
+                type VARCHAR(50) NOT NULL,
+                config JSON NOT NULL DEFAULT '{}',
+                is_enabled BOOLEAN NOT NULL DEFAULT 1,
+                priority INTEGER NOT NULL DEFAULT 0,
+                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+                updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+            )
+        """)
+        )
+
+        # Create workflow_executions table
+        await self.ap.persistence_mgr.execute_async(
+            sqlalchemy.text("""
+            CREATE TABLE IF NOT EXISTS workflow_executions (
+                uuid VARCHAR(255) PRIMARY KEY,
+                workflow_uuid VARCHAR(255) NOT NULL,
+                workflow_version INTEGER NOT NULL,
+                status VARCHAR(20) NOT NULL,
+                trigger_type VARCHAR(50),
+                trigger_data JSON,
+                variables JSON,
+                start_time TIMESTAMP,
+                end_time TIMESTAMP,
+                error TEXT,
+                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+            )
+        """)
+        )
+
+        # Create workflow_node_executions table
+        await self.ap.persistence_mgr.execute_async(
+            sqlalchemy.text("""
+            CREATE TABLE IF NOT EXISTS workflow_node_executions (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                execution_uuid VARCHAR(255) NOT NULL,
+                node_id VARCHAR(100) NOT NULL,
+                node_type VARCHAR(50) NOT NULL,
+                status VARCHAR(20) NOT NULL,
+                inputs JSON,
+                outputs JSON,
+                start_time TIMESTAMP,
+                end_time TIMESTAMP,
+                error TEXT,
+                retry_count INTEGER NOT NULL DEFAULT 0
+            )
+        """)
+        )
+
+        # Create workflow_scheduled_jobs table
+        await self.ap.persistence_mgr.execute_async(
+            sqlalchemy.text("""
+            CREATE TABLE IF NOT EXISTS workflow_scheduled_jobs (
+                uuid VARCHAR(255) PRIMARY KEY,
+                trigger_uuid VARCHAR(255) NOT NULL,
+                cron_expression VARCHAR(100),
+                next_run_time TIMESTAMP,
+                last_run_time TIMESTAMP,
+                is_enabled BOOLEAN NOT NULL DEFAULT 1
+            )
+        """)
+        )
+
+        # Create indexes
+        await self.ap.persistence_mgr.execute_async(
+            sqlalchemy.text('CREATE INDEX IF NOT EXISTS idx_workflow_versions_uuid ON workflow_versions(workflow_uuid)')
+        )
+        await self.ap.persistence_mgr.execute_async(
+            sqlalchemy.text('CREATE INDEX IF NOT EXISTS idx_workflow_triggers_uuid ON workflow_triggers(workflow_uuid)')
+        )
+        await self.ap.persistence_mgr.execute_async(
+            sqlalchemy.text(
+                'CREATE INDEX IF NOT EXISTS idx_workflow_executions_uuid ON workflow_executions(workflow_uuid)'
+            )
+        )
+        await self.ap.persistence_mgr.execute_async(
+            sqlalchemy.text(
+                'CREATE INDEX IF NOT EXISTS idx_workflow_node_executions_uuid ON workflow_node_executions(execution_uuid)'
+            )
+        )
+        await self.ap.persistence_mgr.execute_async(
+            sqlalchemy.text(
+                'CREATE INDEX IF NOT EXISTS idx_workflow_scheduled_jobs_trigger ON workflow_scheduled_jobs(trigger_uuid)'
+            )
+        )
+
+        # Update bots table: add binding_type column (default to 'pipeline' for backward compatibility)
+        # Check if column exists first (SQLite doesn't support IF NOT EXISTS for columns)
+        try:
+            await self.ap.persistence_mgr.execute_async(sqlalchemy.text('SELECT binding_type FROM bots LIMIT 1'))
+        except Exception:
+            # Column doesn't exist, add it
+            await self.ap.persistence_mgr.execute_async(
+                sqlalchemy.text("ALTER TABLE bots ADD COLUMN binding_type VARCHAR(20) NOT NULL DEFAULT 'pipeline'")
+            )
+
+    async def downgrade(self):
+        # Drop tables in reverse order
+        await self.ap.persistence_mgr.execute_async(sqlalchemy.text('DROP TABLE IF EXISTS workflow_scheduled_jobs'))
+        await self.ap.persistence_mgr.execute_async(sqlalchemy.text('DROP TABLE IF EXISTS workflow_node_executions'))
+        await self.ap.persistence_mgr.execute_async(sqlalchemy.text('DROP TABLE IF EXISTS workflow_executions'))
+        await self.ap.persistence_mgr.execute_async(sqlalchemy.text('DROP TABLE IF EXISTS workflow_triggers'))
+        await self.ap.persistence_mgr.execute_async(sqlalchemy.text('DROP TABLE IF EXISTS workflow_versions'))
+        await self.ap.persistence_mgr.execute_async(sqlalchemy.text('DROP TABLE IF EXISTS workflows'))
+
+        # Remove binding_type column from bots (SQLite doesn't support DROP COLUMN directly)
+        # This would need a table recreation in SQLite, so we'll skip it in downgrade

src/langbot/pkg/persistence/migrations/dbm027_bot_binding_fields.py

@@ -0,0 +1,49 @@
+"""Add binding_uuid field to bots table and migrate data"""
+
+import sqlalchemy
+from .. import migration
+
+
+@migration.migration_class(27)
+class DBMigrateBotBindingFields(migration.DBMigration):
+    """Add binding_uuid field to bots table and migrate existing data"""
+
+    async def upgrade(self):
+        # Add binding_uuid column to bots table
+        # Check if column exists first (SQLite doesn't support IF NOT EXISTS for columns)
+        try:
+            await self.ap.persistence_mgr.execute_async(sqlalchemy.text('SELECT binding_uuid FROM bots LIMIT 1'))
+        except Exception:
+            # Column doesn't exist, add it
+            await self.ap.persistence_mgr.execute_async(
+                sqlalchemy.text('ALTER TABLE bots ADD COLUMN binding_uuid VARCHAR(64)')
+            )
+
+        # Migrate existing data: copy use_pipeline_uuid to binding_uuid for records
+        # that have a pipeline bound and binding_uuid is not set yet
+        await self.ap.persistence_mgr.execute_async(
+            sqlalchemy.text("""
+            UPDATE bots
+            SET binding_uuid = use_pipeline_uuid
+            WHERE use_pipeline_uuid IS NOT NULL
+              AND use_pipeline_uuid != ''
+              AND (binding_uuid IS NULL OR binding_uuid = '')
+        """)
+        )
+
+        # Ensure binding_type is 'pipeline' for records that were migrated
+        await self.ap.persistence_mgr.execute_async(
+            sqlalchemy.text("""
+            UPDATE bots
+            SET binding_type = 'pipeline'
+            WHERE binding_uuid IS NOT NULL
+              AND binding_uuid != ''
+              AND (binding_type IS NULL OR binding_type = '')
+        """)
+        )
+
+    async def downgrade(self):
+        # SQLite doesn't support DROP COLUMN directly
+        # This would need a table recreation in SQLite, so we'll skip it in downgrade
+        # The column will remain but won't be used
+        pass

src/langbot/pkg/pipeline/pipelinemgr.py

@@ -13,7 +13,7 @@ import langbot_plugin.api.entities.builtin.platform.message as platform_message
 import langbot_plugin.api.entities.builtin.platform.events as platform_events
 import langbot_plugin.api.entities.events as events
 from ..utils import importutil
-from .config_coercion import coerce_pipeline_config
+from .config import coerce_pipeline_config
 
 import langbot_plugin.api.entities.builtin.provider.session as provider_session
 import langbot_plugin.api.entities.builtin.pipeline.query as pipeline_query
@@ -284,9 +284,9 @@ class RuntimePipeline:
         # Record query start and store message_id
         message_id = ''
         try:
-            from . import monitoring_helper
+            from . import monitor
 
-            message_id = await monitoring_helper.MonitoringHelper.record_query_start(
+            message_id = await monitor.MonitoringHelper.record_query_start(
                 ap=self.ap,
                 query=query,
                 bot_id=query.bot_uuid or 'unknown',
@@ -338,7 +338,7 @@ class RuntimePipeline:
             # Record query success only if no error occurred during processing
             if not query.variables.get('_monitoring_has_error', False):
                 try:
-                    await monitoring_helper.MonitoringHelper.record_query_success(
+                    await monitor.MonitoringHelper.record_query_success(
                         ap=self.ap,
                         message_id=message_id,
                         query=query,
@@ -348,7 +348,7 @@ class RuntimePipeline:
 
                 # Record bot response message
                 try:
-                    await monitoring_helper.MonitoringHelper.record_query_response(
+                    await monitor.MonitoringHelper.record_query_response(
                         ap=self.ap,
                         query=query,
                         bot_id=query.bot_uuid or 'unknown',
@@ -367,9 +367,9 @@ class RuntimePipeline:
 
             # Record query error
             try:
-                from . import monitoring_helper
+                from . import monitor
 
-                await monitoring_helper.MonitoringHelper.record_query_error(
+                await monitor.MonitoringHelper.record_query_error(
                     ap=self.ap,
                     query=query,
                     bot_id=query.bot_uuid or 'unknown',
@@ -384,7 +384,8 @@ class RuntimePipeline:
 
         finally:
             self.ap.logger.debug(f'Query {query.query_id} processed')
-            del self.ap.query_pool.cached_queries[query.query_id]
+            # Use pop with default to avoid KeyError if query was never cached
+            self.ap.query_pool.cached_queries.pop(query.query_id, None)
 
 
 class PipelineManager:

src/langbot/pkg/platform/botmgr.py

@@ -2,7 +2,6 @@ from __future__ import annotations
 
 import asyncio
 import json
-import re
 import traceback
 import sqlalchemy
 
@@ -54,29 +53,24 @@ class RuntimeBot:
         self.task_context = taskmgr.TaskContext()
         self.logger = logger
 
-    @staticmethod
-    def _match_operator(actual: str, operator: str, expected: str) -> bool:
-        """Evaluate a single operator condition."""
-        if operator == 'eq':
-            return actual == expected
-        elif operator == 'neq':
-            return actual != expected
-        elif operator == 'contains':
-            return expected in actual
-        elif operator == 'not_contains':
-            return expected not in actual
-        elif operator == 'starts_with':
-            return actual.startswith(expected)
-        elif operator == 'regex':
-            try:
-                return bool(re.search(expected, actual))
-            except re.error:
-                return False
-        return False
-
     PIPELINE_DISCARD = '__discard__'
     PIPELINE_DISCARD_DISPLAY_NAME = 'Discarded'
 
+    def get_binding_info(self) -> tuple[str, str | None]:
+        """Get the binding type and UUID for this bot.
+
+        Returns:
+            tuple: (binding_type, binding_uuid) where binding_type is 'pipeline' or 'workflow'
+        """
+        binding_type = getattr(self.bot_entity, 'binding_type', 'pipeline') or 'pipeline'
+        binding_uuid = getattr(self.bot_entity, 'binding_uuid', None)
+
+        # Fallback to use_pipeline_uuid for backward compatibility
+        if not binding_uuid and binding_type == 'pipeline':
+            binding_uuid = self.bot_entity.use_pipeline_uuid
+
+        return binding_type, binding_uuid
+
     def resolve_pipeline_uuid(
         self,
         launcher_type: str,
@@ -84,56 +78,26 @@ class RuntimeBot:
         message_text: str,
         message_element_types: list[str] | None = None,
     ) -> tuple[str | None, bool]:
-        """Resolve pipeline UUID based on routing rules.
+        """Resolve pipeline UUID for message processing.
 
-        Rules are evaluated in order; first match wins.
-        Falls back to use_pipeline_uuid if no rule matches.
-
-        Rule types:
-          - launcher_type: session type ("person" / "group")
-          - launcher_id: session / group id
-          - message_content: message text content
-          - message_has_element: message contains element of given type
-            (Image, Voice, File, Forward, Face, At, AtAll, Quote)
-            Operators: eq (has), neq (doesn't have)
-
-        Operators: eq, neq, contains, not_contains, starts_with, regex
-
-        When pipeline_uuid is ``__discard__``, the message should be
-        silently dropped by the caller.
+        NOTE: Routing rules have been removed. Bot now directly binds to a
+        Pipeline or Workflow. This method is kept for backward compatibility
+        but only returns the direct binding.
 
         Returns:
-            tuple: (pipeline_uuid, routed_by_rule) - routed_by_rule is True
-            when a routing rule matched, False when falling back to default.
+            tuple: (pipeline_uuid, routed_by_rule) - routed_by_rule is always False
+            as routing rules are no longer used.
         """
-        rules = self.bot_entity.pipeline_routing_rules or []
-        element_type_set = set(message_element_types or [])
+        binding_type, binding_uuid = self.get_binding_info()
 
-        for rule in rules:
-            rule_type = rule.get('type')
-            operator = rule.get('operator', 'eq')
-            rule_value = rule.get('value', '')
-            target_uuid = rule.get('pipeline_uuid')
-            if not rule_type or not target_uuid:
-                continue
+        # If bound to workflow, return None for pipeline_uuid
+        # The caller should check binding_type and handle accordingly
+        if binding_type == 'workflow':
+            # For workflow binding, we still need to return something
+            # The actual workflow handling should be done by the caller
+            return None, False
 
-            if rule_type == 'launcher_type':
-                if self._match_operator(launcher_type, operator, rule_value):
-                    return target_uuid, True
-            elif rule_type == 'launcher_id':
-                if self._match_operator(str(launcher_id), operator, str(rule_value)):
-                    return target_uuid, True
-            elif rule_type == 'message_content':
-                if self._match_operator(message_text, operator, rule_value):
-                    return target_uuid, True
-            elif rule_type == 'message_has_element':
-                has_element = rule_value in element_type_set
-                if operator == 'eq' and has_element:
-                    return target_uuid, True
-                elif operator == 'neq' and not has_element:
-                    return target_uuid, True
-
-        return self.bot_entity.use_pipeline_uuid, False
+        return binding_uuid, False
 
     async def _record_discarded_message(
         self,

src/langbot/pkg/platform/sources/websocket_adapter.py

@@ -373,6 +373,7 @@ class WebSocketAdapter(abstract_platform_adapter.AbstractMessagePlatformAdapter)
         """
         pipeline_uuid = connection.pipeline_uuid
         session_type = connection.session_type
+        is_workflow = bool(connection.metadata.get('is_workflow'))
 
         # 获取stream参数，默认为True
         self.stream_enabled = message_data.get('stream', True)
@@ -414,6 +415,60 @@ class WebSocketAdapter(abstract_platform_adapter.AbstractMessagePlatformAdapter)
             session_type=session_type,
         )
 
+        if is_workflow:
+            # 设置 pipeline_uuid，以便工作流节点发送消息时能正确广播
+            self.ap.platform_mgr.websocket_proxy_bot.bot_entity.use_pipeline_uuid = pipeline_uuid
+
+            message_content = str(message_chain)
+            message_context = {
+                'message_id': str(message_id),
+                'message_content': message_content,
+                'sender_id': f'websocket_{connection.connection_id}',
+                'sender_name': 'User',
+                'platform': 'websocket',
+                'conversation_id': connection.connection_id,
+                'is_group': session_type == 'group',
+                'group_id': 'websocketgroup' if session_type == 'group' else None,
+                'mentions': [],
+                'reply_to': None,
+                'raw_message': {
+                    'message': message_chain_obj,
+                    'connection_id': connection.connection_id,
+                    'session_type': session_type,
+                },
+            }
+
+            trigger_data = {
+                'message': message_content,
+                'message_chain': message_chain_obj,
+                'session_type': session_type,
+                'connection_id': connection.connection_id,
+                'message_context': message_context,
+            }
+
+            try:
+                from ...api.http.service.workflow import WorkflowExecutionFailedError
+
+                # Log workflow execution start (matching pipeline logging)
+                session_id = f'{session_type}_{connection.connection_id}'
+                logger.info(f'Processing request from {session_id} (0): {message_content}')
+
+                execution_id = await self.ap.workflow_service.execute_workflow(
+                    pipeline_uuid,
+                    trigger_type='message',
+                    trigger_data=trigger_data,
+                    session_id=session_id,
+                    user_id=message_context['sender_id'],
+                    bot_id=self.ap.platform_mgr.websocket_proxy_bot.bot_entity.uuid,
+                )
+                # Removed success broadcast - only show error on failure
+            except WorkflowExecutionFailedError as e:
+                await connection.send_queue.put({'type': 'error', 'message': e.message})
+            except Exception as e:
+                logger.error(f'Workflow websocket execution error: {e}', exc_info=True)
+                await connection.send_queue.put({'type': 'error', 'message': str(e)})
+            return
+
         # 添加消息源
         message_chain.insert(0, platform_message.Source(id=message_id, time=datetime.now().timestamp()))
 

src/langbot/pkg/provider/modelmgr/requester.py

@@ -84,7 +84,7 @@ class RuntimeProvider:
 
                 # Import monitoring helper
                 try:
-                    from ...pipeline import monitoring_helper
+                    from ...pipeline import monitor
 
                     # Get monitoring metadata from query variables
                     if query.variables:
@@ -96,7 +96,7 @@ class RuntimeProvider:
                         pipeline_name = 'Unknown'
                         message_id = None
 
-                    await monitoring_helper.MonitoringHelper.record_llm_call(
+                    await monitor.MonitoringHelper.record_llm_call(
                         ap=self.requester.ap,
                         query=query,
                         bot_id=query.bot_uuid or 'unknown',
@@ -154,7 +154,7 @@ class RuntimeProvider:
 
                 # Import monitoring helper
                 try:
-                    from ...pipeline import monitoring_helper
+                    from ...pipeline import monitor
 
                     # Get monitoring metadata from query variables
                     if query.variables:
@@ -166,7 +166,7 @@ class RuntimeProvider:
                         pipeline_name = 'Unknown'
                         message_id = None
 
-                    await monitoring_helper.MonitoringHelper.record_llm_call(
+                    await monitor.MonitoringHelper.record_llm_call(
                         ap=self.requester.ap,
                         query=query,
                         bot_id=query.bot_uuid or 'unknown',

src/langbot/pkg/workflow/adapters.py

@@ -0,0 +1,204 @@
+"""Workflow-Pipeline通信适配器
+
+这个模块提供了Workflow和Pipeline之间的通信适配，使用SDK标准的MessageEnvelope格式。
+"""
+
+from __future__ import annotations
+
+import logging
+from typing import Any, Optional
+
+logger = logging.getLogger(__name__)
+
+
+class _WorkflowPipelineCaptureAdapter:
+    """Workflow-Pipeline通信适配器
+    
+    用于在Workflow节点和Pipeline之间进行标准化的消息传递。
+    支持MessageEnvelope格式的双向转换。
+    """
+    
+    def __init__(self, context: Any):
+        """初始化适配器
+        
+        Args:
+            context: ExecutionContext - Workflow执行上下文
+        """
+        self.context = context
+        self.responses: list[dict[str, Any]] = []
+        self.bot_account_id: Optional[str] = None
+        self._logger = logging.getLogger(__name__)
+    
+    async def call_pipeline_with_envelope(
+        self,
+        envelope: Any,
+        pipeline_executor: Any
+    ) -> Any:
+        """使用MessageEnvelope调用Pipeline
+        
+        Args:
+            envelope: MessageEnvelope - 标准消息信封
+            pipeline_executor: Pipeline执行器实例
+            
+        Returns:
+            MessageEnvelope - 执行结果信封
+        """
+        try:
+            # 动态导入以避免循环依赖
+            from langbot_plugin_sdk.workflow import envelope_to_query, query_to_envelope
+            
+            # 1. 转换为Query
+            query = envelope_to_query(envelope)
+            
+            # 2. 调用Pipeline
+            result_query = await pipeline_executor.execute(query)
+            
+            # 3. 转换回Envelope
+            result_envelope = query_to_envelope(result_query, envelope)
+            
+            self._logger.debug(
+                f'Pipeline execution completed for workflow {envelope.workflow_id}',
+                extra={
+                    'workflow_id': envelope.workflow_id,
+                    'execution_id': envelope.execution_id,
+                    'node_id': envelope.node_id,
+                }
+            )
+            
+            return result_envelope
+            
+        except Exception as e:
+            self._logger.error(
+                f'Pipeline execution failed: {e}',
+                exc_info=True,
+                extra={
+                    'workflow_id': envelope.workflow_id,
+                    'execution_id': envelope.execution_id,
+                    'node_id': envelope.node_id,
+                }
+            )
+            raise
+    
+    def validate_envelope(self, envelope: Any) -> bool:
+        """验证MessageEnvelope的有效性
+        
+        Args:
+            envelope: MessageEnvelope - 要验证的消息信封
+            
+        Returns:
+            bool - 验证是否通过
+        """
+        required_fields = [
+            'message_id',
+            'workflow_id',
+            'node_id',
+            'execution_id',
+            'payload',
+            'launcher_type',
+        ]
+        
+        for field in required_fields:
+            if not hasattr(envelope, field):
+                self._logger.warning(
+                    f'MessageEnvelope missing required field: {field}'
+                )
+                return False
+        
+        return True
+    
+    def get_responses(self) -> list[dict[str, Any]]:
+        """获取所有响应
+        
+        Returns:
+            list - 响应列表
+        """
+        return self.responses.copy()
+    
+    def add_response(self, response: dict[str, Any]) -> None:
+        """添加响应
+        
+        Args:
+            response: dict - 响应数据
+        """
+        self.responses.append(response)
+    
+    def get_last_text_response(self) -> str:
+        """获取最后一个文本响应
+        
+        Returns:
+            str - 最后一个响应的文本内容
+        """
+        if not self.responses:
+            return ''
+        
+        last_response = self.responses[-1]
+        return str(last_response.get('content', '') or '')
+    
+    def clear_responses(self) -> None:
+        """清空所有响应"""
+        self.responses.clear()
+
+
+class WorkflowPipelineCompatibilityLayer:
+    """Workflow-Pipeline兼容性层
+    
+    提供向后兼容性，支持旧的Pipeline Query格式和新的MessageEnvelope格式。
+    """
+    
+    def __init__(self):
+        """初始化兼容性层"""
+        self._logger = logging.getLogger(__name__)
+    
+    def is_workflow_context(self, query: Any) -> bool:
+        """检查Query是否包含Workflow上下文
+        
+        Args:
+            query: Query - Pipeline Query对象
+            
+        Returns:
+            bool - 是否来自Workflow
+        """
+        if hasattr(query, 'is_from_workflow'):
+            return query.is_from_workflow()
+        
+        if hasattr(query, 'get_workflow_context'):
+            context = query.get_workflow_context()
+            return bool(context and context.get('workflow_id'))
+        
+        return False
+    
+    def get_workflow_id(self, query: Any) -> Optional[str]:
+        """从Query获取Workflow ID
+        
+        Args:
+            query: Query - Pipeline Query对象
+            
+        Returns:
+            str - Workflow ID，如果不存在则返回None
+        """
+        if hasattr(query, 'get_workflow_id'):
+            return query.get_workflow_id()
+        
+        if hasattr(query, 'get_workflow_context'):
+            context = query.get_workflow_context()
+            return context.get('workflow_id') if context else None
+        
+        return None
+    
+    def get_execution_id(self, query: Any) -> Optional[str]:
+        """从Query获取执行ID
+        
+        Args:
+            query: Query - Pipeline Query对象
+            
+        Returns:
+            str - 执行ID，如果不存在则返回None
+        """
+        if hasattr(query, 'get_execution_id'):
+            return query.get_execution_id()
+        
+        if hasattr(query, 'get_workflow_context'):
+            context = query.get_workflow_context()
+            return context.get('execution_id') if context else None
+        
+        return None

src/langbot/pkg/workflow/debug.py

@@ -0,0 +1,509 @@
+"""Workflow debug execution support.
+
+This module provides debugging capabilities for workflow execution, including:
+- ExecutionLog: Structured log entries for execution tracking
+- DebugExecutionState: State management for debug sessions (pause, resume, breakpoints)
+- DebugWorkflowExecutor: Extended executor with step-by-step debugging support
+"""
+
+from __future__ import annotations
+
+import asyncio
+import logging
+import traceback
+import uuid
+from datetime import datetime
+from typing import Any, Optional, TYPE_CHECKING
+
+from .entities import (
+    WorkflowDefinition,
+    NodeDefinition,
+    EdgeDefinition,
+    ExecutionContext,
+    ExecutionStatus,
+    NodeState,
+    NodeStatus,
+)
+from .executor import WorkflowExecutor
+
+if TYPE_CHECKING:
+    from ..core import app
+
+logger = logging.getLogger(__name__)
+
+
+class ExecutionLog:
+    """Execution log entry"""
+
+    def __init__(self, level: str, message: str, node_id: Optional[str] = None, data: Optional[dict] = None):
+        self.id = str(uuid.uuid4())
+        self.timestamp = datetime.now().isoformat()
+        self.level = level
+        self.message = message
+        self.node_id = node_id
+        self.data = data or {}
+
+    def to_dict(self) -> dict:
+        return {
+            'id': self.id,
+            'timestamp': self.timestamp,
+            'level': self.level,
+            'message': self.message,
+            'node_id': self.node_id,
+            'data': self.data,
+        }
+
+
+class DebugExecutionState:
+    """State for a debug execution"""
+
+    def __init__(self, execution_id: str, breakpoints: list[str] = None):
+        self.execution_id = execution_id
+        self.status: str = 'running'
+        self.is_paused: bool = False
+        self.is_stopped: bool = False
+        self.current_node_id: Optional[str] = None
+        self.breakpoints: set[str] = set(breakpoints or [])
+        self.logs: list[ExecutionLog] = []
+        self.pending_logs: list[ExecutionLog] = []
+        self._pause_event = asyncio.Event()
+        self._pause_event.set()  # Initially not paused
+        self._stop_event = asyncio.Event()
+
+    def add_log(self, level: str, message: str, node_id: str = None, data: dict = None):
+        """Add a log entry"""
+        log = ExecutionLog(level, message, node_id, data)
+        self.logs.append(log)
+        self.pending_logs.append(log)
+        logger.log(
+            getattr(logging, level.upper(), logging.INFO),
+            f'[Workflow Debug] {message}',
+            extra={'node_id': node_id, 'data': data},
+        )
+
+    def get_pending_logs(self) -> list[dict]:
+        """Get and clear pending logs"""
+        logs = [log.to_dict() for log in self.pending_logs]
+        self.pending_logs = []
+        return logs
+
+    def pause(self):
+        """Pause execution"""
+        self.is_paused = True
+        self._pause_event.clear()
+        self.add_log('info', 'Execution paused')
+
+    def resume(self):
+        """Resume execution"""
+        self.is_paused = False
+        self._pause_event.set()
+        self.add_log('info', 'Execution resumed')
+
+    def stop(self):
+        """Stop execution"""
+        self.is_stopped = True
+        self.status = 'cancelled'
+        self._stop_event.set()
+        self._pause_event.set()  # Release any pause
+        self.add_log('info', 'Execution stopped')
+
+    async def wait_if_paused(self):
+        """Wait if execution is paused"""
+        if self.is_paused:
+            self.add_log('info', 'Waiting for resume...')
+            await self._pause_event.wait()
+
+    def check_breakpoint(self, node_id: str) -> bool:
+        """Check if there's a breakpoint at the given node"""
+        return node_id in self.breakpoints
+
+
+class DebugWorkflowExecutor(WorkflowExecutor):
+    """
+    Debug-enabled workflow executor with step-by-step execution support.
+    Extends WorkflowExecutor with debugging capabilities.
+    """
+
+    # Class-level storage for active debug sessions
+    _debug_states: dict[str, DebugExecutionState] = {}
+
+    def __init__(self, ap: Optional['app.Application'] = None):
+        super().__init__(ap)
+
+    @classmethod
+    def get_debug_state(cls, execution_id: str) -> Optional[DebugExecutionState]:
+        """Get debug state for an execution"""
+        return cls._debug_states.get(execution_id)
+
+    @classmethod
+    def create_debug_state(cls, execution_id: str, breakpoints: list[str] = None) -> DebugExecutionState:
+        """Create a new debug state"""
+        state = DebugExecutionState(execution_id, breakpoints)
+        cls._debug_states[execution_id] = state
+        return state
+
+    @classmethod
+    def remove_debug_state(cls, execution_id: str):
+        """Remove debug state for an execution"""
+        cls._debug_states.pop(execution_id, None)
+
+    async def execute_debug(
+        self,
+        workflow: WorkflowDefinition,
+        context: ExecutionContext,
+        debug_state: DebugExecutionState,
+    ) -> ExecutionContext:
+        """
+        Execute a workflow in debug mode.
+
+        Args:
+            workflow: Workflow definition
+            context: Execution context
+            debug_state: Debug execution state
+
+        Returns:
+            Updated execution context
+        """
+        context.status = ExecutionStatus.RUNNING
+        context.start_time = datetime.now()
+        debug_state.add_log('info', f'Starting debug execution for workflow: {workflow.name}')
+
+        try:
+            # Build execution graph
+            node_map = {node.id: node for node in workflow.nodes}
+            edge_map = self._build_edge_map(workflow.edges)
+            self._edges = workflow.edges
+
+            # Initialize node states
+            for node in workflow.nodes:
+                if node.id not in context.node_states:
+                    context.node_states[node.id] = NodeState(node_id=node.id)
+
+            # Find start node(s)
+            start_nodes = self._find_start_nodes(workflow.nodes, workflow.edges)
+
+            if not start_nodes:
+                raise ValueError('No start nodes found in workflow')
+
+            debug_state.add_log('info', f'Found {len(start_nodes)} start node(s)')
+
+            # Execute from start nodes
+            for start_node in start_nodes:
+                if debug_state.is_stopped:
+                    break
+
+                await self._execute_debug_from_node(
+                    start_node, node_map, edge_map, context, debug_state, workflow.settings.max_retries
+                )
+
+            # Set final status
+            if debug_state.is_stopped:
+                context.status = ExecutionStatus.CANCELLED
+                debug_state.status = 'cancelled'
+            else:
+                all_completed = all(
+                    state.status in (NodeStatus.COMPLETED, NodeStatus.SKIPPED) for state in context.node_states.values()
+                )
+
+                if all_completed:
+                    context.status = ExecutionStatus.COMPLETED
+                    debug_state.status = 'completed'
+                    debug_state.add_log('info', 'Workflow execution completed successfully')
+                else:
+                    has_failed = any(state.status == NodeStatus.FAILED for state in context.node_states.values())
+                    if has_failed:
+                        context.status = ExecutionStatus.FAILED
+                        debug_state.status = 'error'
+
+        except Exception as e:
+            context.status = ExecutionStatus.FAILED
+            context.error = str(e)
+            debug_state.status = 'error'
+            debug_state.add_log('error', f'Workflow execution failed: {e}', data={'traceback': traceback.format_exc()})
+            logger.error(f'Debug workflow execution failed: {e}\n{traceback.format_exc()}')
+
+        finally:
+            context.end_time = datetime.now()
+
+        return context
+
+    async def _execute_debug_from_node(
+        self,
+        node: NodeDefinition,
+        node_map: dict[str, NodeDefinition],
+        edge_map: dict[str, list[EdgeDefinition]],
+        context: ExecutionContext,
+        debug_state: DebugExecutionState,
+        max_retries: int = 3,
+    ):
+        """Execute workflow from a node with debug support"""
+
+        # Check if stopped
+        if debug_state.is_stopped:
+            return
+
+        # Wait if paused
+        await debug_state.wait_if_paused()
+
+        # Check if should skip
+        if await self._should_skip_node(node, context):
+            if context.node_states[node.id].status == NodeStatus.SKIPPED:
+                debug_state.add_log('info', f'Skipping node: {node.id}', node_id=node.id)
+            return
+
+        # Check breakpoint
+        if debug_state.check_breakpoint(node.id):
+            debug_state.add_log('info', f'Hit breakpoint at node: {node.id}', node_id=node.id)
+            debug_state.pause()
+            await debug_state.wait_if_paused()
+
+        # Update current node
+        debug_state.current_node_id = node.id
+        debug_state.add_log('info', f'Executing node: {node.id} ({node.type})', node_id=node.id)
+
+        # Execute node
+        await self._execute_debug_node(node, context, debug_state, max_retries)
+
+        # Check if stopped or failed
+        if debug_state.is_stopped:
+            return
+        if context.node_states[node.id].status == NodeStatus.FAILED:
+            return
+
+        # Get outgoing edges
+        outgoing_edges = edge_map.get(node.id, [])
+
+        # Execute next nodes
+        for edge in outgoing_edges:
+            if debug_state.is_stopped:
+                break
+
+            target_node = node_map.get(edge.target_node)
+            if not target_node:
+                continue
+
+            # Check edge condition
+            if edge.condition:
+                condition_met = await self._evaluate_condition(edge.condition, context)
+                if not condition_met:
+                    debug_state.add_log('debug', f'Edge condition not met: {edge.condition}', node_id=node.id)
+                    continue
+
+            # Check if all inputs are ready
+            if await self._inputs_ready(target_node, edge_map, context):
+                await self._execute_debug_from_node(target_node, node_map, edge_map, context, debug_state, max_retries)
+
+    async def _execute_debug_node(
+        self, node: NodeDefinition, context: ExecutionContext, debug_state: DebugExecutionState, max_retries: int = 3
+    ):
+        """Execute a single node with debug logging"""
+
+        node_state = context.node_states[node.id]
+        node_state.status = NodeStatus.RUNNING
+        node_state.start_time = datetime.now()
+
+        # Get node instance (pass ap for access to services)
+        node_instance = self.registry.create_instance(node.type, node.id, node.config, ap=self.ap)
+
+        if not node_instance:
+            node_state.status = NodeStatus.FAILED
+            node_state.error = f'Unknown node type: {node.type}'
+            node_state.end_time = datetime.now()
+            debug_state.add_log('error', f'Unknown node type: {node.type}', node_id=node.id)
+            self._record_execution_step(node, node_state, context)
+            await self._persist_node_execution(node, node_state, context)
+            return
+
+        # Resolve inputs
+        inputs = await self._resolve_inputs(node, context)
+        node_state.inputs = inputs
+        debug_state.add_log(
+            'debug', 'Node inputs resolved', node_id=node.id, data={'inputs': self._safe_serialize(inputs)}
+        )
+
+        # Validate inputs
+        validation_errors = await node_instance.validate_inputs(inputs)
+        if validation_errors:
+            node_state.status = NodeStatus.FAILED
+            node_state.error = '; '.join(validation_errors)
+            node_state.end_time = datetime.now()
+            debug_state.add_log('error', f'Input validation failed: {node_state.error}', node_id=node.id)
+            self._record_execution_step(node, node_state, context)
+            await self._persist_node_execution(node, node_state, context)
+            return
+
+        # Execute with retries
+        for attempt in range(max_retries + 1):
+            if debug_state.is_stopped:
+                node_state.status = NodeStatus.FAILED
+                node_state.error = 'Execution stopped'
+                node_state.end_time = datetime.now()
+                break
+
+            try:
+                outputs = await node_instance.execute(inputs, context)
+                node_state.outputs = outputs
+                node_state.status = NodeStatus.COMPLETED
+                node_state.end_time = datetime.now()
+
+                duration_ms = int((node_state.end_time - node_state.start_time).total_seconds() * 1000)
+                debug_state.add_log(
+                    'info',
+                    f'Node completed in {duration_ms}ms',
+                    node_id=node.id,
+                    data={'outputs': self._safe_serialize(outputs), 'duration_ms': duration_ms},
+                )
+                break
+
+            except Exception as e:
+                node_state.retry_count = attempt + 1
+                debug_state.add_log(
+                    'warning', f'Node execution failed (attempt {attempt + 1}/{max_retries + 1}): {e}', node_id=node.id
+                )
+
+                if attempt < max_retries:
+                    await asyncio.sleep(1)
+                else:
+                    node_state.status = NodeStatus.FAILED
+                    node_state.error = str(e)
+                    node_state.end_time = datetime.now()
+                    debug_state.add_log(
+                        'error',
+                        f'Node failed after {max_retries + 1} attempts: {e}',
+                        node_id=node.id,
+                        data={'error': str(e), 'traceback': traceback.format_exc()},
+                    )
+
+        self._record_execution_step(node, node_state, context)
+        await self._persist_node_execution(node, node_state, context)
+
+    async def step_execute(
+        self,
+        workflow: WorkflowDefinition,
+        context: ExecutionContext,
+        debug_state: DebugExecutionState,
+    ) -> dict:
+        """
+        Execute one step (one node) in debug mode.
+
+        Returns:
+            Dict with node_id, node_state, and completed status
+        """
+        # Find next node to execute
+        next_node = self._find_next_executable_node(workflow, context)
+
+        if not next_node:
+            debug_state.status = 'completed'
+            return {'completed': True}
+
+        # Execute single node
+        debug_state.current_node_id = next_node.id
+        await self._execute_debug_node(next_node, context, debug_state, workflow.settings.max_retries)
+
+        node_state = context.node_states.get(next_node.id)
+
+        # Check if workflow is complete
+        all_done = all(
+            state.status in (NodeStatus.COMPLETED, NodeStatus.SKIPPED, NodeStatus.FAILED)
+            for state in context.node_states.values()
+        )
+
+        if all_done:
+            debug_state.status = 'completed'
+            context.status = ExecutionStatus.COMPLETED
+
+        return {
+            'node_id': next_node.id,
+            'node_state': {
+                'status': node_state.status.value if node_state else 'unknown',
+                'inputs': self._safe_serialize(node_state.inputs) if node_state else {},
+                'outputs': self._safe_serialize(node_state.outputs) if node_state else {},
+                'error': node_state.error if node_state else None,
+            },
+            'completed': all_done,
+        }
+
+    def _find_next_executable_node(
+        self, workflow: WorkflowDefinition, context: ExecutionContext
+    ) -> Optional[NodeDefinition]:
+        """Find the next node that can be executed"""
+        edge_map = self._build_edge_map(workflow.edges)
+
+        for node in workflow.nodes:
+            state = context.node_states.get(node.id)
+
+            # Skip completed, running, or failed nodes
+            if state and state.status in (
+                NodeStatus.COMPLETED,
+                NodeStatus.RUNNING,
+                NodeStatus.FAILED,
+                NodeStatus.SKIPPED,
+            ):
+                continue
+
+            # Check if this node's inputs are ready
+            incoming_nodes = set()
+            for source_id, edges in edge_map.items():
+                for edge in edges:
+                    if edge.target_node == node.id:
+                        incoming_nodes.add(source_id)
+
+            # If no incoming nodes, it's a start node
+            if not incoming_nodes:
+                return node
+
+            # Check if all incoming nodes are done
+            all_incoming_done = True
+            for source_id in incoming_nodes:
+                source_state = context.node_states.get(source_id)
+                if not source_state or source_state.status not in (NodeStatus.COMPLETED, NodeStatus.SKIPPED):
+                    all_incoming_done = False
+                    break
+
+            if all_incoming_done:
+                return node
+
+        return None
+
+    def _safe_serialize(self, data: Any) -> Any:
+        """Safely serialize data for logging"""
+        if data is None:
+            return None
+        if isinstance(data, (str, int, float, bool)):
+            return data
+        if isinstance(data, (list, tuple)):
+            return [self._safe_serialize(item) for item in data[:100]]  # Limit list size
+        if isinstance(data, dict):
+            result = {}
+            for key, value in list(data.items())[:50]:  # Limit dict size
+                result[str(key)] = self._safe_serialize(value)
+            return result
+        # For complex objects, try to convert to string
+        try:
+            return str(data)[:1000]  # Limit string length
+        except Exception:
+            return '<non-serializable>'
+
+    def get_execution_state(self, context: ExecutionContext, debug_state: DebugExecutionState) -> dict:
+        """Get current execution state for API response"""
+        node_states = {}
+        for node_id, state in context.node_states.items():
+            node_states[node_id] = {
+                'status': state.status.value,
+                'inputs': self._safe_serialize(state.inputs),
+                'outputs': self._safe_serialize(state.outputs),
+                'error': state.error,
+                'startTime': state.start_time.isoformat() if state.start_time else None,
+                'endTime': state.end_time.isoformat() if state.end_time else None,
+                'duration': int((state.end_time - state.start_time).total_seconds() * 1000)
+                if state.start_time and state.end_time
+                else None,
+            }
+
+        return {
+            'status': debug_state.status,
+            'current_node_id': debug_state.current_node_id,
+            'node_states': node_states,
+            'new_logs': debug_state.get_pending_logs(),
+            'error': context.error,
+        }

src/langbot/pkg/workflow/entities.py

@@ -0,0 +1,155 @@
+"""Workflow entities and data models
+
+This module defines workflow entities using SDK standard entities where available,
+and local-specific entities for LangBot_copy-specific functionality.
+"""
+
+from __future__ import annotations
+
+from datetime import datetime
+from typing import Any, Optional
+import pydantic
+
+# Import SDK entities for standard workflow protocol types
+from langbot_plugin.api.entities.builtin.workflow.entities import (
+    ExecutionContext,
+    ExecutionStep,
+    MessageContext,
+    NodeDefinition,
+    NodeState,
+    PortDefinition,
+)
+from langbot_plugin.api.entities.builtin.workflow.enums import (
+    ExecutionStatus,
+    NodeStatus,
+)
+
+
+class Position(pydantic.BaseModel):
+    """Node position on canvas"""
+
+    x: float = 0
+    y: float = 0
+
+
+class EdgeDefinition(pydantic.BaseModel):
+    """Workflow edge definition (connection between nodes)"""
+
+    id: str
+    source_node: str
+    source_port: str = 'output'
+    target_node: str
+    target_port: str = 'input'
+    condition: Optional[str] = None  # Optional condition expression
+
+
+class TriggerDefinition(pydantic.BaseModel):
+    """Workflow trigger definition"""
+
+    id: str
+    type: str  # message, cron, event, webhook
+    config: dict[str, Any] = {}
+    enabled: bool = True
+
+
+class WorkflowSettings(pydantic.BaseModel):
+    """Workflow settings"""
+
+    # Execution settings
+    max_execution_time: int = 300  # seconds
+    max_retries: int = 3
+    retry_delay: int = 5  # seconds
+
+    # Error handling
+    error_handling: str = 'stop'  # stop, continue, retry
+
+    # Logging
+    log_level: str = 'info'
+    save_execution_history: bool = True
+
+    # Concurrency
+    max_concurrent_executions: int = 10
+
+
+class SafetyConfig(pydantic.BaseModel):
+    """Safety configuration (inherited from Pipeline)"""
+
+    content_filter: dict[str, Any] = {'enable': False, 'sensitive_words': [], 'replace_with': '***'}
+    rate_limit: dict[str, Any] = {'enable': False, 'requests_per_minute': 60, 'burst_limit': 10}
+
+
+class OutputConfig(pydantic.BaseModel):
+    """Output configuration (inherited from Pipeline)"""
+
+    long_text_processing: dict[str, Any] = {
+        'strategy': 'split',  # split, truncate, file
+        'max_length': 4000,
+        'split_separator': '\n\n',
+    }
+    force_delay: dict[str, Any] = {'enable': False, 'min_delay_ms': 0, 'max_delay_ms': 0}
+    misc: dict[str, Any] = {}
+
+
+class WorkflowGlobalConfig(pydantic.BaseModel):
+    """Workflow global configuration (inherited from Pipeline capabilities)"""
+
+    safety: SafetyConfig = SafetyConfig()
+    output: OutputConfig = OutputConfig()
+
+
+class ExtensionsPreferences(pydantic.BaseModel):
+    """Extensions preferences (same as Pipeline)"""
+
+    enable_all_plugins: bool = True
+    enable_all_mcp_servers: bool = True
+    plugins: list[str] = []
+    mcp_servers: list[str] = []
+
+
+class ConversationVariable(pydantic.BaseModel):
+    """Conversation-level variable definition"""
+
+    name: str
+    type: str = 'string'  # string, number, boolean, object, array
+    description: str = ''
+    default_value: Any = None
+    max_length: Optional[int] = None  # For strings
+
+
+class WorkflowDefinition(pydantic.BaseModel):
+    """Complete workflow definition"""
+
+    uuid: str
+    name: str
+    description: str = ''
+    emoji: str = '💼'
+    version: int = 1
+
+    # Workflow graph
+    nodes: list[NodeDefinition] = []
+    edges: list[EdgeDefinition] = []
+
+    # Variables
+    variables: dict[str, Any] = {}  # Global variables
+    conversation_variables: list[ConversationVariable] = []  # Session-level variables
+
+    # Settings
+    settings: WorkflowSettings = WorkflowSettings()
+
+    # Triggers (for automation)
+    triggers: list[TriggerDefinition] = []
+
+    # Global configuration (inherited from Pipeline)
+    global_config: WorkflowGlobalConfig = WorkflowGlobalConfig()
+
+    # Extensions
+    extensions_preferences: ExtensionsPreferences = ExtensionsPreferences()
+
+    # Metadata
+    is_enabled: bool = True
+    created_at: Optional[datetime] = None
+    updated_at: Optional[datetime] = None
+
+    # Source tracking (for imported workflows)
+    source: Optional[str] = None  # dify, n8n, langflow, etc.
+    source_id: Optional[str] = None

src/langbot/pkg/workflow/executor.py

@@ -0,0 +1,837 @@
+"""Workflow execution engine.
+
+This module contains the core workflow execution logic:
+- WorkflowExecutor: Main execution engine with control flow handling
+- ParallelExecutor: Parallel branch execution
+- LoopExecutor: Loop/iterator execution
+
+Debug execution support has been moved to the ``debug`` module.
+"""
+
+from __future__ import annotations
+
+import ast
+import asyncio
+import logging
+import operator
+import uuid
+from datetime import datetime
+from typing import Any, Optional, TYPE_CHECKING
+
+import sqlalchemy
+
+from .entities import (
+    WorkflowDefinition,
+    NodeDefinition,
+    EdgeDefinition,
+    ExecutionContext,
+    ExecutionStatus,
+    NodeState,
+    NodeStatus,
+    ExecutionStep,
+)
+from ..entity.persistence import workflow as persistence_workflow
+from .registry import NodeTypeRegistry
+from . import monitor
+
+if TYPE_CHECKING:
+    from ..core import app
+
+logger = logging.getLogger(__name__)
+
+
+# ─── Safe expression evaluator (replaces eval()) ─────────────────────
+# Uses Python's ast module to whitelist only comparison / boolean / arithmetic
+# operations.  No function calls, attribute access, or subscript injection.
+
+_SAFE_OPS = {
+    ast.Add: operator.add,
+    ast.Sub: operator.sub,
+    ast.Mult: operator.mul,
+    ast.Div: operator.truediv,
+    ast.FloorDiv: operator.floordiv,
+    ast.Mod: operator.mod,
+    ast.Pow: operator.pow,
+    ast.USub: operator.neg,
+    ast.UAdd: operator.pos,
+    ast.Not: operator.not_,
+    ast.Eq: operator.eq,
+    ast.NotEq: operator.ne,
+    ast.Lt: operator.lt,
+    ast.LtE: operator.le,
+    ast.Gt: operator.gt,
+    ast.GtE: operator.ge,
+    ast.Is: operator.is_,
+    ast.IsNot: operator.is_not,
+    ast.In: lambda a, b: a in b,
+    ast.NotIn: lambda a, b: a not in b,
+}
+
+
+def _safe_eval(expr: str) -> Any:
+    """Evaluate a simple expression safely via AST whitelist.
+
+    Supports: literals, comparisons (==, !=, <, >, <=, >=, in, not in, is, is not),
+    boolean logic (and, or, not), arithmetic (+, -, *, /, //, %, **), and
+    string operations (contains via ``in``).
+
+    Raises ``ValueError`` on any disallowed construct (function calls,
+    attribute access, imports, etc.).
+    """
+    tree = ast.parse(expr.strip(), mode='eval')
+    return _eval_node(tree.body)
+
+
+def _eval_node(node: ast.AST) -> Any:
+    # Literals: numbers, strings, True/False/None
+    if isinstance(node, ast.Constant):
+        return node.value
+
+    # Unary operators: -x, +x, not x
+    if isinstance(node, ast.UnaryOp):
+        op_fn = _SAFE_OPS.get(type(node.op))
+        if op_fn is None:
+            raise ValueError(f'Unsupported unary op: {type(node.op).__name__}')
+        return op_fn(_eval_node(node.operand))
+
+    # Binary operators: x + y, x * y, etc.
+    if isinstance(node, ast.BinOp):
+        op_fn = _SAFE_OPS.get(type(node.op))
+        if op_fn is None:
+            raise ValueError(f'Unsupported binary op: {type(node.op).__name__}')
+        return op_fn(_eval_node(node.left), _eval_node(node.right))
+
+    # Comparisons: x == y, x > y, x in y, etc.  (chained)
+    if isinstance(node, ast.Compare):
+        left = _eval_node(node.left)
+        for op, comparator in zip(node.ops, node.comparators):
+            op_fn = _SAFE_OPS.get(type(op))
+            if op_fn is None:
+                raise ValueError(f'Unsupported comparison: {type(op).__name__}')
+            right = _eval_node(comparator)
+            if not op_fn(left, right):
+                return False
+            left = right
+        return True
+
+    # Boolean operators: x and y, x or y
+    if isinstance(node, ast.BoolOp):
+        if isinstance(node.op, ast.And):
+            return all(_eval_node(v) for v in node.values)
+        if isinstance(node.op, ast.Or):
+            return any(_eval_node(v) for v in node.values)
+
+    # Ternary: x if cond else y
+    if isinstance(node, ast.IfExp):
+        return _eval_node(node.body) if _eval_node(node.test) else _eval_node(node.orelse)
+
+    # Tuples / Lists (used in "x in [1,2,3]")
+    if isinstance(node, (ast.Tuple, ast.List)):
+        return [_eval_node(e) for e in node.elts]
+
+    # Name lookup – only allow None, True, False
+    if isinstance(node, ast.Name):
+        if node.id == 'None':
+            return None
+        if node.id == 'True':
+            return True
+        if node.id == 'False':
+            return False
+        raise ValueError(f'Unsupported variable reference: {node.id}')
+
+    raise ValueError(f'Unsupported expression node: {type(node).__name__}')
+
+
+class WorkflowExecutor:
+    """
+    Workflow execution engine.
+    Handles the execution of workflow definitions with proper control flow.
+    """
+
+    def __init__(self, ap: Optional['app.Application'] = None):
+        self.ap = ap
+        self.registry = NodeTypeRegistry.instance()
+        self._edges: list[EdgeDefinition] = []
+
+    async def execute(
+        self, workflow: WorkflowDefinition, context: ExecutionContext, start_node_id: Optional[str] = None
+    ) -> ExecutionContext:
+        """
+        Execute a workflow.
+
+        Args:
+            workflow: Workflow definition
+            context: Execution context
+            start_node_id: Optional starting node (for resumption)
+
+        Returns:
+            Updated execution context
+        """
+        context.status = ExecutionStatus.RUNNING
+        context.start_time = datetime.now()
+
+        # Note: Frontend panel logging has been removed.
+        # A new solution will be implemented separately.
+        monitoring_message_id = ''
+
+        try:
+            # Build execution graph
+            node_map = {node.id: node for node in workflow.nodes}
+            edge_map = self._build_edge_map(workflow.edges)
+            self._edges = workflow.edges
+
+            # Initialize node states
+            for node in workflow.nodes:
+                if node.id not in context.node_states:
+                    context.node_states[node.id] = NodeState(node_id=node.id, node_type=node.type, status=NodeStatus.PENDING)
+
+            # Find start node(s)
+            if start_node_id:
+                start_nodes = [node_map[start_node_id]]
+            else:
+                start_nodes = self._find_start_nodes(workflow.nodes, workflow.edges)
+
+            if not start_nodes:
+                raise ValueError('No start nodes found in workflow')
+
+            # Execute from start nodes
+            for start_node in start_nodes:
+                await self._execute_from_node(
+                    start_node, node_map, edge_map, context, workflow.settings.max_retries, path=set()
+                )
+
+            # Check final status
+            all_completed = all(
+                state.status in (NodeStatus.COMPLETED, NodeStatus.SKIPPED) for state in context.node_states.values()
+            )
+
+            if all_completed:
+                context.status = ExecutionStatus.COMPLETED
+            else:
+                # Some nodes might still be waiting
+                has_failed = any(state.status == NodeStatus.FAILED for state in context.node_states.values())
+                if has_failed:
+                    context.status = ExecutionStatus.FAILED
+
+        except Exception as e:
+            context.status = ExecutionStatus.FAILED
+            context.error = str(e)
+            logger.error(
+                'Workflow execution failed',
+                exc_info=True,
+                extra={
+                    'workflow_id': workflow.uuid,
+                    'execution_id': context.execution_id,
+                    'node_states': {
+                        node_id: {
+                            'status': state.status.value if state.status else None,
+                            'error': state.error,
+                        }
+                        for node_id, state in context.node_states.items()
+                    },
+                },
+            )
+
+            # Note: Frontend panel logging has been removed.
+            # A new solution will be implemented separately.
+
+        finally:
+            context.end_time = datetime.now()
+
+            # Note: Frontend panel logging has been removed.
+            # A new solution will be implemented separately.
+
+        return context
+
+    async def _execute_from_node(
+        self,
+        node: NodeDefinition,
+        node_map: dict[str, NodeDefinition],
+        edge_map: dict[str, list[EdgeDefinition]],
+        context: ExecutionContext,
+        max_retries: int = 3,
+        path: set[str] | None = None,
+    ):
+        """Execute workflow starting from a specific node"""
+
+        # Initialize path set for cycle detection (path-based, not global visited)
+        if path is None:
+            path = set()
+
+        # Check for circular dependency on the *current path* only
+        # This correctly allows diamond shapes (A→B, A→C, B→D, C→D)
+        if node.id in path:
+            logger.warning(f'Circular dependency detected at node: {node.id}')
+            context.node_states[node.id].status = NodeStatus.SKIPPED
+            context.node_states[node.id].error = 'Circular dependency detected'
+            context.node_states[node.id].end_time = datetime.now()
+            await self._persist_node_execution(node, context.node_states[node.id], context)
+            return
+
+        # Add node to current path
+        path.add(node.id)
+
+        # Check if node should be skipped
+        if await self._should_skip_node(node, context):
+            existing_state = context.node_states[node.id]
+            if existing_state.status == NodeStatus.SKIPPED:
+                existing_state.end_time = existing_state.end_time or datetime.now()
+                await self._persist_node_execution(node, existing_state, context)
+            path.discard(node.id)
+            return
+
+        # Execute current node
+        await self._execute_node(node, context, max_retries)
+
+        # If node failed and we should stop on error, return
+        if context.node_states[node.id].status == NodeStatus.FAILED:
+            path.discard(node.id)
+            return
+
+        node_state = context.node_states[node.id]
+        node_type_name = node.type.split('.')[-1] if '.' in node.type else node.type
+
+        # ── Control flow integration ────────────────────────────────
+        # For loop / iterator nodes: run the LoopExecutor over
+        # downstream body nodes for each item, then continue to the
+        # "completed" output edge.
+        if node_type_name in ('loop', 'iterator'):
+            items = node_state.outputs.get('_items') or []
+            if not items:
+                # iterator: items come from inputs
+                items = node_state.inputs.get('items', node_state.inputs.get('array', []))
+                if not isinstance(items, list):
+                    items = [items] if items else []
+            max_iter = int(node.config.get('max_iterations', 100))
+            items = items[:max_iter]
+
+            # Collect downstream "body" nodes (connected via edges)
+            outgoing_edges = edge_map.get(node.id, [])
+            body_nodes = []
+            for edge in outgoing_edges:
+                target = node_map.get(edge.target_node)
+                if target:
+                    body_nodes.append(target)
+
+            if body_nodes and items:
+                loop_exec = LoopExecutor(self)
+                results = await loop_exec.execute_loop(items, body_nodes, context, max_iter)
+                node_state.outputs['results'] = results
+                node_state.outputs['completed'] = True
+            else:
+                node_state.outputs['results'] = []
+                node_state.outputs['completed'] = True
+
+            path.discard(node.id)
+            return  # body nodes already executed by LoopExecutor
+
+        # For parallel nodes: run downstream branches concurrently
+        if node_type_name == 'parallel':
+            outgoing_edges = edge_map.get(node.id, [])
+            branch_nodes = []
+            for edge in outgoing_edges:
+                target = node_map.get(edge.target_node)
+                if target:
+                    branch_nodes.append([target])
+
+            if branch_nodes:
+                par_exec = ParallelExecutor(self)
+                results = await par_exec.execute_parallel(branch_nodes, context)
+                node_state.outputs['results'] = results
+
+            path.discard(node.id)
+            return  # branch nodes already executed by ParallelExecutor
+
+        # ── Standard edge-based continuation ────────────────────────
+        # Get outgoing edges
+        outgoing_edges = edge_map.get(node.id, [])
+
+        # Execute next nodes based on edge conditions
+        for edge in outgoing_edges:
+            target_node = node_map.get(edge.target_node)
+            if not target_node:
+                continue
+
+            # Check edge condition
+            if edge.condition:
+                condition_met = await self._evaluate_condition(edge.condition, context)
+                if not condition_met:
+                    continue
+
+            # Check if all inputs are ready
+            if await self._inputs_ready(target_node, edge_map, context):
+                await self._execute_from_node(target_node, node_map, edge_map, context, max_retries, path)
+
+        # Remove node from path when backtracking (allows diamond revisit)
+        path.discard(node.id)
+
+    async def _execute_node(self, node: NodeDefinition, context: ExecutionContext, max_retries: int = 3):
+        """Execute a single node with retry logic"""
+
+        node_state = context.node_states[node.id]
+        node_state.status = NodeStatus.RUNNING
+        node_state.start_time = datetime.now()
+
+        # Get node instance (pass ap for access to services)
+        node_instance = self.registry.create_instance(node.type, node.id, node.config, ap=self.ap)
+
+        if not node_instance:
+            node_state.status = NodeStatus.FAILED
+            node_state.error = f'Unknown node type: {node.type}'
+            node_state.end_time = datetime.now()
+            self._record_execution_step(node, node_state, context)
+            await self._persist_node_execution(node, node_state, context)
+            return
+
+        # Resolve inputs
+        inputs = await self._resolve_inputs(node, context)
+        node_state.inputs = inputs
+
+        # Validate inputs
+        validation_errors = await node_instance.validate_inputs(inputs)
+        if validation_errors:
+            node_state.status = NodeStatus.FAILED
+            node_state.error = '; '.join(validation_errors)
+            node_state.end_time = datetime.now()
+            self._record_execution_step(node, node_state, context)
+            await self._persist_node_execution(node, node_state, context)
+            return
+
+        # Check if node supports streaming (has execute_stream method and stream config is enabled)
+        use_streaming = hasattr(node_instance, 'execute_stream') and node.config.get('stream', False)
+
+        # Execute with retries
+        for attempt in range(max_retries + 1):
+            try:
+                if use_streaming:
+                    # Streaming execution with aggregation and timeout
+                    aggregated_response = ''
+                    try:
+                        async with asyncio.timeout(300):  # 5 minute timeout for streaming
+                            async for chunk in node_instance.execute_stream(inputs, context):
+                                if chunk:
+                                    aggregated_response += chunk
+                    except asyncio.TimeoutError:
+                        logger.warning(f'Node {node.id} ({node.type}) streaming timed out, falling back to non-streaming')
+                        use_streaming = False
+                        outputs = await node_instance.execute(inputs, context)
+                    else:
+                        # Get response from context if set by execute_stream, otherwise use aggregated
+                        final_response = context.variables.pop('_last_llm_response', aggregated_response)
+                        outputs = {'response': final_response, 'usage': {'prompt_tokens': 0, 'completion_tokens': 0, 'total_tokens': 0}}
+                        logger.info(f'Node {node.id} ({node.type}) streaming completed, response length: {len(final_response)}')
+                else:
+                    outputs = await node_instance.execute(inputs, context)
+                node_state.outputs = outputs
+                node_state.status = NodeStatus.COMPLETED
+                node_state.end_time = datetime.now()
+                break
+            except Exception as e:
+                node_state.retry_count = attempt + 1
+                logger.error(
+                    f'Node {node.id} ({node.type}) execution failed (attempt {attempt + 1}/{max_retries + 1}): {e}',
+                    exc_info=True,
+                    extra={
+                        'node_id': node.id,
+                        'node_type': node.type,
+                        'attempt': attempt + 1,
+                        'max_retries': max_retries,
+                        'execution_id': context.execution_id,
+                    },
+                )
+
+                if attempt < max_retries:
+                    await asyncio.sleep(1)  # Brief delay before retry
+                else:
+                    node_state.status = NodeStatus.FAILED
+                    node_state.error = str(e)
+                    node_state.end_time = datetime.now()
+                    logger.error(
+                        f'Node {node.id} ({node.type}) permanently failed after {max_retries + 1} attempts',
+                        extra={
+                            'node_id': node.id,
+                            'node_type': node.type,
+                            'error': str(e),
+                            'execution_id': context.execution_id,
+                        },
+                    )
+
+        self._record_execution_step(node, node_state, context)
+        await self._persist_node_execution(node, node_state, context)
+
+    async def _resolve_inputs(self, node: NodeDefinition, context: ExecutionContext) -> dict[str, Any]:
+        """Resolve input values for a node from connected nodes and context"""
+        inputs = {}
+
+        # Get inputs from context variables
+        if 'message' in context.variables:
+            inputs['message'] = context.variables['message']
+
+        # Get inputs from message context
+        if context.message_context:
+            inputs['message'] = context.message_context.message_content
+            inputs['message_content'] = context.message_context.message_content
+            inputs['sender_id'] = context.message_context.sender_id
+            inputs['platform'] = context.message_context.platform
+        else:
+            logger.warning(
+                f'[_resolve_inputs] node={node.id} ({node.type}): message_context is None!',
+                extra={
+                    'node_id': node.id,
+                    'node_type': node.type,
+                    'execution_id': context.execution_id,
+                    'variables_keys': list(context.variables.keys()) if context.variables else [],
+                },
+            )
+
+        # Log current inputs state after message_context processing
+        logger.debug(
+            f'[_resolve_inputs] node={node.id} after message_context: {list(inputs.keys())}',
+        )
+
+        # Get inputs from node config that reference other nodes
+        for key, value in node.config.items():
+            if isinstance(value, str) and value.startswith('{{') and value.endswith('}}'):
+                resolved = await self._resolve_expression(value[2:-2], context)
+                inputs[key] = resolved
+            else:
+                inputs[key] = value
+
+        # Get inputs from connected upstream nodes via edges
+        # Build a reverse map: for each incoming edge to this node, find the
+        # source node and the specific source/target port.
+        for edge in self._edges:
+            if edge.target_node != node.id:
+                continue
+            source_state = context.node_states.get(edge.source_node)
+            if not source_state or source_state.status != NodeStatus.COMPLETED:
+                continue
+            target_port = edge.target_port or 'input'
+            source_port = edge.source_port or 'output'
+            # Map the source node's output port value to this node's input port
+            if source_port in source_state.outputs:
+                inputs[target_port] = source_state.outputs[source_port]
+            elif 'output' in source_state.outputs:
+                # Fallback: if exact port not found, try generic 'output'
+                inputs[target_port] = source_state.outputs['output']
+            elif source_state.outputs:
+                # Last resort: use the first available output
+                inputs[target_port] = next(iter(source_state.outputs.values()))
+
+        # Smart input mapping: if a node needs 'message' but received a different
+        # port name (e.g., 'content' from llm_call), copy the value to 'message'.
+        # This handles edge connection mismatches where the sender uses a different
+        # port name than what the receiver expects.
+        if 'message' not in inputs or inputs.get('message') is None:
+            for fallback_key in ('content', 'response', 'input', 'output', 'result', 'text'):
+                if fallback_key in inputs and inputs[fallback_key] is not None:
+                    inputs['message'] = inputs[fallback_key]
+                    logger.debug(
+                        f'[_resolve_inputs] node={node.id}: mapped {fallback_key} -> message',
+                    )
+                    break
+
+        logger.debug(
+            f'[_resolve_inputs] node={node.id} final inputs keys: {list(inputs.keys())}, message={repr(inputs.get("message", "<missing>")[:100] if isinstance(inputs.get("message"), str) else inputs.get("message"))}',
+        )
+        return inputs
+
+    async def _resolve_expression(self, expression: str, context: ExecutionContext) -> Any:
+        """Resolve a variable expression like 'nodes.node1.outputs.text'"""
+        parts = expression.strip().split('.')
+
+        if not parts:
+            return None
+
+        if parts[0] == 'nodes' and len(parts) >= 4:
+            # nodes.node_id.outputs.output_name
+            node_id = parts[1]
+            if parts[2] == 'outputs' and node_id in context.node_states:
+                output_name = '.'.join(parts[3:])
+                return context.node_states[node_id].outputs.get(output_name)
+
+        elif parts[0] == 'variables':
+            # variables.var_name
+            var_name = '.'.join(parts[1:])
+            return context.variables.get(var_name)
+
+        elif parts[0] == 'conversation_variables':
+            # conversation_variables.var_name
+            var_name = '.'.join(parts[1:])
+            return context.conversation_variables.get(var_name)
+
+        elif parts[0] == 'message':
+            # message.content, message.sender_id, etc.
+            if context.message_context:
+                attr = parts[1] if len(parts) > 1 else None
+                if attr == 'content':
+                    return context.message_context.message_content
+                elif attr == 'sender_id':
+                    return context.message_context.sender_id
+                elif attr == 'platform':
+                    return context.message_context.platform
+                elif attr == 'conversation_id':
+                    return context.message_context.conversation_id
+
+        return None
+
+    async def _evaluate_condition(self, condition: str, context: ExecutionContext) -> bool:
+        """Evaluate a condition expression safely using AST whitelist"""
+        try:
+            # Resolve variable references in condition
+            if '{{' in condition:
+                import re
+
+                pattern = r'\{\{([^}]+)\}\}'
+
+                # First pass: replace all variable references with placeholders
+                placeholders = {}
+                placeholder_idx = 0
+
+                def replace_with_placeholder(match):
+                    nonlocal placeholder_idx
+                    var_expr = match.group(1)
+                    placeholder = f'__PH{placeholder_idx}__'
+                    placeholders[placeholder] = var_expr
+                    placeholder_idx += 1
+                    return placeholder
+
+                condition_with_placeholders = re.sub(pattern, replace_with_placeholder, condition)
+
+                # Second pass: resolve each placeholder asynchronously
+                for placeholder, var_expr in placeholders.items():
+                    value = await self._resolve_expression(var_expr, context)
+                    if isinstance(value, str):
+                        condition_with_placeholders = condition_with_placeholders.replace(placeholder, f'"{value}"')
+                    elif value is None:
+                        condition_with_placeholders = condition_with_placeholders.replace(placeholder, 'None')
+                    else:
+                        condition_with_placeholders = condition_with_placeholders.replace(placeholder, str(value))
+
+                condition = condition_with_placeholders
+
+            # Safe expression evaluation using AST whitelist
+            result = _safe_eval(condition)
+            return bool(result)
+
+        except Exception as e:
+            logger.warning(f'Condition evaluation failed: {condition} - {e}')
+            return False
+
+    async def _should_skip_node(self, node: NodeDefinition, context: ExecutionContext) -> bool:
+        """Check if a node should be skipped"""
+        state = context.node_states.get(node.id)
+        if state and state.status in (NodeStatus.COMPLETED, NodeStatus.RUNNING, NodeStatus.SKIPPED):
+            return True
+        return False
+
+    async def _inputs_ready(
+        self, node: NodeDefinition, edge_map: dict[str, list[EdgeDefinition]], context: ExecutionContext
+    ) -> bool:
+        """Check if all inputs for a node are ready"""
+        # Find all edges that connect to this node
+        incoming_nodes = set()
+        for source_id, edges in edge_map.items():
+            for edge in edges:
+                if edge.target_node == node.id:
+                    incoming_nodes.add(source_id)
+
+        # Check if all incoming nodes have completed
+        for source_id in incoming_nodes:
+            state = context.node_states.get(source_id)
+            if not state or state.status not in (NodeStatus.COMPLETED, NodeStatus.SKIPPED):
+                return False
+
+        return True
+
+    def _find_start_nodes(self, nodes: list[NodeDefinition], edges: list[EdgeDefinition]) -> list[NodeDefinition]:
+        """Find nodes that have no incoming edges (start nodes)"""
+        target_nodes = {edge.target_node for edge in edges}
+        start_nodes = [node for node in nodes if node.id not in target_nodes]
+
+        # Also check for trigger nodes
+        trigger_types = {'message_trigger', 'cron_trigger', 'webhook_trigger', 'event_trigger'}
+        for node in nodes:
+            if node.type in trigger_types and node not in start_nodes:
+                start_nodes.insert(0, node)
+
+        return start_nodes
+
+    def _build_edge_map(self, edges: list[EdgeDefinition]) -> dict[str, list[EdgeDefinition]]:
+        """Build a map of source node ID to outgoing edges"""
+        edge_map: dict[str, list[EdgeDefinition]] = {}
+        for edge in edges:
+            if edge.source_node not in edge_map:
+                edge_map[edge.source_node] = []
+            edge_map[edge.source_node].append(edge)
+        return edge_map
+
+    def _record_execution_step(self, node: NodeDefinition, node_state: NodeState, context: ExecutionContext):
+        """Record an execution step in the history"""
+        duration_ms = 0
+        if node_state.start_time and node_state.end_time:
+            duration_ms = int((node_state.end_time - node_state.start_time).total_seconds() * 1000)
+
+        step = ExecutionStep(
+            step_id=f"step_{uuid.uuid4().hex[:8]}",
+            timestamp=datetime.now(),
+            node_id=node.id,
+            node_type=node.type,
+            status=node_state.status,
+            duration_ms=duration_ms,
+            error=node_state.error,
+            inputs=node_state.inputs,
+            outputs=node_state.outputs,
+        )
+        context.history.append(step)
+
+    async def _persist_node_execution(
+        self,
+        node: NodeDefinition,
+        node_state: NodeState,
+        context: ExecutionContext,
+    ):
+        """Persist node execution state for execution detail and logs."""
+        if not self.ap:
+            return
+
+        values = {
+            'execution_uuid': context.execution_id,
+            'node_id': node.id,
+            'node_type': node.type,
+            'status': node_state.status.value,
+            'inputs': node_state.inputs,
+            'outputs': node_state.outputs,
+            'start_time': node_state.start_time,
+            'end_time': node_state.end_time,
+            'error': node_state.error,
+            'retry_count': node_state.retry_count,
+        }
+
+        existing_query = sqlalchemy.select(persistence_workflow.WorkflowNodeExecution).where(
+            persistence_workflow.WorkflowNodeExecution.execution_uuid == context.execution_id,
+            persistence_workflow.WorkflowNodeExecution.node_id == node.id,
+        )
+        existing_result = await self.ap.persistence_mgr.execute_async(existing_query)
+        existing = existing_result.first()
+
+        if existing is None:
+            await self.ap.persistence_mgr.execute_async(
+                sqlalchemy.insert(persistence_workflow.WorkflowNodeExecution).values(**values)
+            )
+        else:
+            await self.ap.persistence_mgr.execute_async(
+                sqlalchemy.update(persistence_workflow.WorkflowNodeExecution)
+                .where(persistence_workflow.WorkflowNodeExecution.id == existing.id)
+                .values(**values)
+            )
+
+
+class ParallelExecutor:
+    """Execute multiple branches in parallel"""
+
+    def __init__(self, executor: WorkflowExecutor):
+        self.executor = executor
+
+    async def execute_parallel(
+        self, branches: list[list[NodeDefinition]], context: ExecutionContext
+    ) -> list[dict[str, Any]]:
+        """
+        Execute multiple branches in parallel.
+
+        Args:
+            branches: List of node sequences to execute in parallel
+            context: Execution context
+
+        Returns:
+            List of results from each branch
+        """
+        tasks = []
+        for branch in branches:
+            task = self._execute_branch(branch, context)
+            tasks.append(task)
+
+        results = await asyncio.gather(*tasks, return_exceptions=True)
+
+        processed_results = []
+        for result in results:
+            if isinstance(result, Exception):
+                processed_results.append({'error': str(result)})
+            else:
+                processed_results.append(result)
+
+        return processed_results
+
+    async def _execute_branch(self, nodes: list[NodeDefinition], context: ExecutionContext) -> dict[str, Any]:
+        """Execute a single branch"""
+        # Create a copy of context for this branch
+        branch_outputs = {}
+
+        for node in nodes:
+            await self.executor._execute_node(node, context, max_retries=3)
+            state = context.node_states.get(node.id)
+            if state and state.status == NodeStatus.COMPLETED:
+                branch_outputs[node.id] = state.outputs
+            elif state and state.status == NodeStatus.FAILED:
+                branch_outputs['error'] = state.error
+                break
+
+        return branch_outputs
+
+
+class LoopExecutor:
+    """Execute loop iterations"""
+
+    def __init__(self, executor: WorkflowExecutor):
+        self.executor = executor
+
+    async def execute_loop(
+        self, items: list[Any], loop_body: list[NodeDefinition], context: ExecutionContext, max_iterations: int = 100
+    ) -> list[dict[str, Any]]:
+        """
+        Execute a loop over items.
+
+        Args:
+            items: Items to iterate over
+            loop_body: Nodes to execute for each item
+            context: Execution context
+            max_iterations: Maximum number of iterations
+
+        Returns:
+            List of results from each iteration
+        """
+        results = []
+
+        for i, item in enumerate(items[:max_iterations]):
+            # Set loop variables
+            context.variables['loop_item'] = item
+            context.variables['loop_index'] = i
+            context.variables['loop_is_first'] = i == 0
+            context.variables['loop_is_last'] = i == len(items) - 1
+
+            iteration_result = {}
+
+            for node in loop_body:
+                # Reset node state for this iteration
+                context.node_states[node.id] = NodeState(node_id=node.id, node_type=node.type, status=NodeStatus.PENDING)
+
+                await self.executor._execute_node(node, context, max_retries=3)
+
+                state = context.node_states.get(node.id)
+                if state:
+                    iteration_result[node.id] = state.outputs
+
+                    # Check for break condition
+                    if state.outputs.get('break', False):
+                        results.append(iteration_result)
+                        return results
+
+            results.append(iteration_result)
+
+        # Clean up loop variables
+        context.variables.pop('loop_item', None)
+        context.variables.pop('loop_index', None)
+        context.variables.pop('loop_is_first', None)
+        context.variables.pop('loop_is_last', None)
+
+        return results

src/langbot/pkg/workflow/metadata.py

@@ -0,0 +1,284 @@
+"""Workflow node metadata loading and validation.
+
+This module makes YAML files under ``templates/metadata/nodes`` the backend
+source of truth for workflow node metadata. Python node classes still provide
+execution logic, but UI-facing metadata is loaded from YAML.
+"""
+
+from __future__ import annotations
+
+import copy
+import logging
+from importlib import resources
+from pathlib import Path
+from typing import Any, Iterable, Optional
+
+import yaml
+
+logger = logging.getLogger(__name__)
+
+
+class MetadataLoadError(Exception):
+    """Raised when a workflow node metadata file cannot be loaded."""
+
+
+class MetadataValidationError(Exception):
+    """Raised when workflow node metadata does not match the expected shape."""
+
+
+class NodeMetadataValidator:
+    """Validate workflow node metadata loaded from YAML files.
+
+    The validator is intentionally strict about the structural fields that the
+    editor needs, but tolerant of legacy YAML details such as missing top-level
+    ``label`` or additional frontend field types.
+    """
+
+    REQUIRED_FIELDS = ('name', 'category', 'inputs', 'outputs', 'config')
+    VALID_CATEGORIES = {'trigger', 'process', 'control', 'action', 'integration', 'misc'}
+    VALID_PORT_TYPES = {'any', 'string', 'number', 'integer', 'boolean', 'object', 'array', 'datetime', 'null'}
+    VALID_CONFIG_TYPES = {
+        'string',
+        'integer',
+        'number',
+        'float',
+        'boolean',
+        'select',
+        'json',
+        'textarea',
+        'text',
+        'secret',
+        'array[string]',
+        'file',
+        'array[file]',
+        'llm-model-selector',
+        'embedding-model-selector',
+        'rerank-model-selector',
+        'pipeline-selector',
+        'knowledge-base-selector',
+        'knowledge-base-multi-selector',
+        'bot-selector',
+        'tools-selector',
+        'model-fallback-selector',
+        'prompt-editor',
+        'plugin-selector',
+        'webhook-url',
+        'embed-code',
+        'workflow-selector',
+    }
+
+    def validate(self, metadata: dict[str, Any]) -> list[str]:
+        """Return validation errors. An empty list means the metadata is valid."""
+        errors: list[str] = []
+
+        if not isinstance(metadata, dict):
+            return ['metadata root must be a mapping']
+
+        for field in self.REQUIRED_FIELDS:
+            if field not in metadata:
+                errors.append(f'missing required field: {field}')
+
+        if errors:
+            return errors
+
+        name = metadata.get('name')
+        if not isinstance(name, str) or not name.strip():
+            errors.append('field "name" must be a non-empty string')
+
+        category = metadata.get('category')
+        if category not in self.VALID_CATEGORIES:
+            errors.append(f'invalid category: {category}')
+
+        errors.extend(self._validate_ports(metadata.get('inputs'), 'inputs'))
+        errors.extend(self._validate_ports(metadata.get('outputs'), 'outputs'))
+        errors.extend(self._validate_config(metadata.get('config')))
+
+        return errors
+
+    def validate_or_raise(self, metadata: dict[str, Any]) -> dict[str, Any]:
+        """Validate metadata and raise ``MetadataValidationError`` on failure."""
+        errors = self.validate(metadata)
+        if errors:
+            node_name = metadata.get('name', 'unknown') if isinstance(metadata, dict) else 'unknown'
+            raise MetadataValidationError(f'invalid metadata for {node_name}: {errors}')
+        return metadata
+
+    def _validate_ports(self, ports: Any, field_name: str) -> list[str]:
+        errors: list[str] = []
+        if not isinstance(ports, list):
+            return [f'{field_name} must be a list']
+
+        seen_names: set[str] = set()
+        for index, port in enumerate(ports):
+            path = f'{field_name}[{index}]'
+            if not isinstance(port, dict):
+                errors.append(f'{path} must be a mapping')
+                continue
+
+            name = port.get('name')
+            if not isinstance(name, str) or not name:
+                errors.append(f'{path}.name must be a non-empty string')
+                continue
+
+            if name in seen_names:
+                errors.append(f'{path}.name duplicates "{name}"')
+            seen_names.add(name)
+
+            port_type = port.get('type', 'any')
+            if port_type not in self.VALID_PORT_TYPES:
+                errors.append(f'{path}.type has unsupported value "{port_type}"')
+
+        return errors
+
+    def _validate_config(self, config: Any) -> list[str]:
+        errors: list[str] = []
+        if not isinstance(config, list):
+            return ['config must be a list']
+
+        seen_names: set[str] = set()
+        for index, item in enumerate(config):
+            path = f'config[{index}]'
+            if not isinstance(item, dict):
+                errors.append(f'{path} must be a mapping')
+                continue
+
+            name = item.get('name')
+            if not isinstance(name, str) or not name:
+                errors.append(f'{path}.name must be a non-empty string')
+                continue
+
+            if name in seen_names:
+                errors.append(f'{path}.name duplicates "{name}"')
+            seen_names.add(name)
+
+            item_type = item.get('type', 'string')
+            if item_type not in self.VALID_CONFIG_TYPES:
+                errors.append(f'{path}.type has unsupported value "{item_type}"')
+
+            min_value = item.get('min_value')
+            max_value = item.get('max_value')
+            if isinstance(min_value, (int, float)) and isinstance(max_value, (int, float)) and min_value > max_value:
+                errors.append(f'{path}.min_value must be <= max_value')
+
+        return errors
+
+
+class NodeMetadataLoader:
+    """Load and cache workflow node metadata from YAML files."""
+
+    def __init__(self, validator: Optional[NodeMetadataValidator] = None) -> None:
+        self._validator = validator or NodeMetadataValidator()
+        self._metadata: dict[str, dict[str, Any]] = {}
+        self._sources: dict[str, str] = {}
+        self._load_errors: list[dict[str, str]] = []
+
+    async def load_core_metadata(self, resource_dir: str = 'metadata/nodes') -> int:
+        """Load all core node metadata from the ``langbot.templates`` package."""
+        return await self.load_package_directory('langbot.templates', resource_dir, source='core')
+
+    async def load_package_directory(self, package: str, resource_dir: str, source: str = 'core') -> int:
+        """Load YAML files from a package resource directory."""
+        try:
+            root = resources.files(package).joinpath(resource_dir)
+            yaml_files = sorted(
+                (item for item in root.iterdir() if item.is_file() and item.name.endswith(('.yaml', '.yml'))),
+                key=lambda item: item.name,
+            )
+        except Exception as exc:
+            raise MetadataLoadError(f'failed to scan package directory {package}:{resource_dir}: {exc}') from exc
+
+        return self._load_files(yaml_files, source=source)
+
+    async def load_directory(self, directory: str | Path, source: str) -> int:
+        """Load YAML files from an external filesystem directory, e.g. a plugin."""
+        directory_path = Path(directory)
+        if not directory_path.exists():
+            logger.warning('Workflow metadata directory does not exist: %s', directory_path)
+            return 0
+        if not directory_path.is_dir():
+            raise MetadataLoadError(f'workflow metadata path is not a directory: {directory_path}')
+
+        yaml_files = sorted(directory_path.glob('*.yml')) + sorted(directory_path.glob('*.yaml'))
+        return self._load_files(yaml_files, source=source)
+
+    def get_metadata(self, node_type: str) -> Optional[dict[str, Any]]:
+        """Return metadata by full type or short node name."""
+        if node_type in self._metadata:
+            return copy.deepcopy(self._metadata[node_type])
+
+        short_name = node_type.split('.')[-1]
+        for registered_type, metadata in self._metadata.items():
+            if registered_type.split('.')[-1] == short_name or metadata.get('name') == short_name:
+                return copy.deepcopy(metadata)
+
+        return None
+
+    def get_all_metadata(self) -> dict[str, dict[str, Any]]:
+        """Return a deep copy of all loaded metadata keyed by canonical node type."""
+        return copy.deepcopy(self._metadata)
+
+    def get_load_errors(self) -> list[dict[str, str]]:
+        """Return metadata files that failed to load or validate."""
+        return copy.deepcopy(self._load_errors)
+
+    def clear(self) -> None:
+        """Clear all cached metadata and errors."""
+        self._metadata.clear()
+        self._sources.clear()
+        self._load_errors.clear()
+
+    def _load_files(self, yaml_files: Iterable[Any], source: str) -> int:
+        count = 0
+        for yaml_file in yaml_files:
+            file_name = getattr(yaml_file, 'name', str(yaml_file))
+            try:
+                metadata = self._load_yaml(yaml_file)
+                self._validator.validate_or_raise(metadata)
+                node_type = build_node_type(metadata)
+
+                if node_type in self._metadata:
+                    existing_source = self._sources.get(node_type, 'unknown')
+                    if existing_source == 'core' and source != 'core':
+                        raise MetadataLoadError(
+                            f'plugin source "{source}" attempted to override core node "{node_type}"'
+                        )
+                    logger.warning(
+                        'Workflow node metadata %s from %s overrides previous source %s',
+                        node_type,
+                        source,
+                        existing_source,
+                    )
+
+                cached_metadata = copy.deepcopy(metadata)
+                cached_metadata['_source'] = source
+                cached_metadata['_file'] = file_name
+                self._metadata[node_type] = cached_metadata
+                self._sources[node_type] = source
+                count += 1
+            except Exception as exc:
+                self._load_errors.append({'file': file_name, 'source': source, 'error': str(exc)})
+                logger.error('Failed to load workflow node metadata %s: %s', file_name, exc)
+
+        return count
+
+    def _load_yaml(self, yaml_file: Any) -> dict[str, Any]:
+        try:
+            if hasattr(yaml_file, 'open'):
+                with yaml_file.open('r', encoding='utf-8') as file:
+                    data = yaml.load(file, Loader=yaml.FullLoader)
+            else:
+                with open(yaml_file, 'r', encoding='utf-8') as file:
+                    data = yaml.load(file, Loader=yaml.FullLoader)
+        except Exception as exc:
+            raise MetadataLoadError(f'failed to parse YAML: {exc}') from exc
+
+        if not isinstance(data, dict):
+            raise MetadataLoadError('YAML root must be a mapping')
+        return data
+
+
+def build_node_type(metadata: dict[str, Any]) -> str:
+    """Build canonical ``category.name`` node type from metadata."""
+    category = metadata.get('category') or 'misc'
+    name = metadata.get('name') or ''
+    return f'{category}.{name}'

src/langbot/pkg/workflow/monitor.py

@@ -0,0 +1,61 @@
+"""
+Monitoring helper for recording events during workflow execution.
+This module provides convenient methods to record monitoring data
+without cluttering the main workflow code.
+
+NOTE: All frontend panel logging functionality has been removed.
+A new solution will be implemented separately.
+"""
+
+from __future__ import annotations
+
+import typing
+import time
+
+if typing.TYPE_CHECKING:
+    from ..core import app
+    from langbot_plugin.api.entities.builtin.workflow.query import WorkflowQuery
+
+
+class WorkflowMonitoringHelper:
+    """Helper class for workflow monitoring operations"""
+
+    # All frontend panel logging methods have been removed.
+    # A new solution will be implemented separately.
+    pass
+
+
+class LLMCallMonitor:
+    """Context manager for monitoring LLM calls in workflow"""
+
+    def __init__(
+        self,
+        ap: app.Application,
+        query: WorkflowQuery,
+        bot_id: str,
+        bot_name: str,
+        workflow_id: str,
+        workflow_name: str,
+        node_name: str,
+        model_name: str,
+    ):
+        self.ap = ap
+        self.query = query
+        self.bot_id = bot_id
+        self.bot_name = bot_name
+        self.workflow_id = workflow_id
+        self.workflow_name = workflow_name
+        self.node_name = node_name
+        self.model_name = model_name
+        self.start_time = None
+        self.input_tokens = 0
+        self.output_tokens = 0
+
+    async def __aenter__(self):
+        self.start_time = time.time()
+        return self
+
+    async def __aexit__(self, exc_type, exc_val, exc_tb):
+        # LLM call monitoring has been removed.
+        # A new solution will be implemented separately.
+        return False

src/langbot/pkg/workflow/monitoring_helper.py

@@ -0,0 +1,350 @@
+"""
+Monitoring helper for recording events during workflow execution.
+This module provides convenient methods to record monitoring data
+without cluttering the main workflow code.
+
+Logging scheme (aligned with pipeline monitoring):
+- Trigger log: stores original user message content directly
+- LLM call log: uses record_llm_call only (no additional message record)
+- LLM response log: stores response message content directly
+- Reply log: stores reply content directly
+
+Fields are extracted from WorkflowQuery object when available, with fallback to context_vars.
+"""
+
+from __future__ import annotations
+
+import typing
+import time
+import json
+
+if typing.TYPE_CHECKING:
+    from ..core import app
+    from langbot_plugin.api.entities.builtin.workflow.query import WorkflowQuery
+
+
+class WorkflowMonitoringHelper:
+    """Helper class for workflow monitoring operations"""
+
+    @staticmethod
+    def _get_session_id(query, context_vars: dict | None = None) -> str:
+        """Build session_id from query or context_vars"""
+        # Try to get from query first
+        if not isinstance(query, str) and query.launcher_type:
+            launcher_type = query.launcher_type.value if hasattr(query.launcher_type, 'value') else str(query.launcher_type)
+            launcher_id = query.launcher_id or 'unknown'
+            return f'{launcher_type}_{launcher_id}'
+        
+        # Fallback to context_vars
+        if context_vars and context_vars.get('_launcher_type') and context_vars.get('_launcher_id'):
+            return f"{context_vars['_launcher_type']}_{context_vars['_launcher_id']}"
+        
+        return 'workflow_session'
+
+    @staticmethod
+    def _get_platform(query, context_vars: dict | None = None) -> str:
+        """Get platform name from query or context_vars"""
+        if not isinstance(query, str) and query.launcher_type:
+            if hasattr(query.launcher_type, 'value'):
+                return query.launcher_type.value
+            return str(query.launcher_type)
+        return 'workflow'
+
+    @staticmethod
+    def _get_sender_name(query, context_vars: dict | None = None) -> str | None:
+        """Get sender name from query or context_vars"""
+        # Try query first
+        if not isinstance(query, str):
+            if query.sender_name:
+                return query.sender_name
+            if query.message_event and hasattr(query.message_event, 'sender'):
+                sender = query.message_event.sender
+                if hasattr(sender, 'nickname'):
+                    return sender.nickname
+                if hasattr(sender, 'member_name'):
+                    return sender.member_name
+        
+        # Fallback to context_vars
+        if context_vars:
+            return context_vars.get('_sender_name')
+        
+        return None
+
+    @staticmethod
+    async def record_trigger_log(
+        ap: app.Application,
+        query,
+        workflow_id: str,
+        workflow_name: str,
+        bot_name: str = 'Workflow',
+        context_vars: dict | None = None,
+    ) -> str:
+        """Record trigger node log (stores original user message content directly)
+        
+        Aligned with pipeline monitoring: record_query_start
+        """
+        try:
+            session_id = WorkflowMonitoringHelper._get_session_id(query, context_vars)
+            platform = WorkflowMonitoringHelper._get_platform(query, context_vars)
+            sender_name = WorkflowMonitoringHelper._get_sender_name(query, context_vars)
+            
+            # Get message content - store original content directly
+            message_content = ''
+            if isinstance(query, str):
+                message_content = query
+            elif not isinstance(query, str) and query.message_context:
+                message_content = query.message_context.message_content
+            elif not isinstance(query, str) and query.message_chain and hasattr(query.message_chain, 'model_dump'):
+                message_content = json.dumps(query.message_chain.model_dump(), ensure_ascii=False)
+            elif not isinstance(query, str) and query.user_message:
+                message_content = str(query.user_message)
+            
+            # Get bot_id and user_id
+            bot_id = ''
+            user_id = None
+            if not isinstance(query, str):
+                bot_id = query.bot_uuid or ''
+                user_id = query.sender_id
+            elif context_vars:
+                bot_id = context_vars.get('_bot_id', '') or ''
+                user_id = context_vars.get('_user_id')
+            
+            message_id = await ap.monitoring_service.record_message(
+                bot_id=bot_id,
+                bot_name=bot_name,
+                pipeline_id=workflow_id,
+                pipeline_name=workflow_name or 'Workflow',
+                message_content=message_content,
+                session_id=session_id,
+                status='success',
+                level='info',
+                platform=platform,
+                user_id=user_id,
+                user_name=sender_name,
+                role='user',
+                runner_name='local-workflow',
+            )
+            
+            return message_id
+        except Exception as e:
+            ap.logger.error(f'Failed to record trigger log: {e}')
+            return ''
+
+    @staticmethod
+    async def record_llm_call_log(
+        ap: app.Application,
+        query,
+        workflow_id: str,
+        workflow_name: str,
+        node_name: str,
+        model_name: str,
+        input_tokens: int,
+        output_tokens: int,
+        duration_ms: int,
+        status: str = 'success',
+        error_message: str | None = None,
+        bot_name: str = 'Workflow',
+        context_vars: dict | None = None,
+        input_message: str | None = None,
+        message_id: str | None = None,
+    ):
+        """Record LLM call log with message_id association
+        
+        Aligned with pipeline monitoring: record_llm_call with message_id
+        LLM calls are aggregated under the trigger log via message_id.
+        """
+        try:
+            session_id = WorkflowMonitoringHelper._get_session_id(query, context_vars)
+            
+            # Get bot_id
+            bot_id = ''
+            if not isinstance(query, str):
+                bot_id = query.bot_uuid or ''
+            elif context_vars:
+                bot_id = context_vars.get('_bot_id', '') or ''
+            
+            # Record LLM call with message_id for association
+            await ap.monitoring_service.record_llm_call(
+                bot_id=bot_id,
+                bot_name=bot_name,
+                pipeline_id=workflow_id,
+                pipeline_name=workflow_name or 'Workflow',
+                session_id=session_id,
+                model_name=model_name,
+                input_tokens=input_tokens,
+                output_tokens=output_tokens,
+                duration=duration_ms,
+                status=status,
+                error_message=error_message,
+                message_id=message_id,
+            )
+        except Exception as e:
+            ap.logger.error(f'Failed to record LLM call log: {e}')
+
+    @staticmethod
+    async def record_llm_response_log(
+        ap: app.Application,
+        query,
+        workflow_id: str,
+        workflow_name: str,
+        node_name: str,
+        response_content: str,
+        bot_name: str = 'Workflow',
+        context_vars: dict | None = None,
+    ):
+        """Record LLM response log (stores response content directly)
+        
+        Aligned with pipeline monitoring: record_query_response
+        """
+        try:
+            session_id = WorkflowMonitoringHelper._get_session_id(query, context_vars)
+            platform = WorkflowMonitoringHelper._get_platform(query, context_vars)
+            sender_name = WorkflowMonitoringHelper._get_sender_name(query, context_vars)
+            
+            # Get bot_id and user_id
+            bot_id = ''
+            user_id = None
+            if not isinstance(query, str):
+                bot_id = query.bot_uuid or ''
+                user_id = query.sender_id
+            elif context_vars:
+                bot_id = context_vars.get('_bot_id', '') or ''
+                user_id = context_vars.get('_user_id')
+            
+            # Store response content directly, no prefix
+            await ap.monitoring_service.record_message(
+                bot_id=bot_id,
+                bot_name=bot_name,
+                pipeline_id=workflow_id,
+                pipeline_name=workflow_name or 'Workflow',
+                message_content=response_content[:2000],  # Limit length
+                session_id=session_id,
+                status='success',
+                level='info',
+                platform=platform,
+                user_id=user_id,
+                user_name=sender_name,
+                role='assistant',
+                runner_name='local-workflow',
+            )
+        except Exception as e:
+            ap.logger.error(f'Failed to record LLM response log: {e}')
+
+    @staticmethod
+    async def record_reply_log(
+        ap: app.Application,
+        query,
+        workflow_id: str,
+        workflow_name: str,
+        node_name: str,
+        reply_content: str,
+        bot_name: str = 'Workflow',
+        context_vars: dict | None = None,
+    ):
+        """Record reply message log (stores reply content directly)
+        
+        Aligned with pipeline monitoring: record_query_response
+        """
+        try:
+            session_id = WorkflowMonitoringHelper._get_session_id(query, context_vars)
+            platform = WorkflowMonitoringHelper._get_platform(query, context_vars)
+            sender_name = WorkflowMonitoringHelper._get_sender_name(query, context_vars)
+            
+            # Get bot_id and user_id
+            bot_id = ''
+            user_id = None
+            if not isinstance(query, str):
+                bot_id = query.bot_uuid or ''
+                user_id = query.sender_id
+            elif context_vars:
+                bot_id = context_vars.get('_bot_id', '') or ''
+                user_id = context_vars.get('_user_id')
+            
+            # Store reply content directly, no prefix
+            await ap.monitoring_service.record_message(
+                bot_id=bot_id,
+                bot_name=bot_name,
+                pipeline_id=workflow_id,
+                pipeline_name=workflow_name or 'Workflow',
+                message_content=reply_content[:2000],  # Limit length
+                session_id=session_id,
+                status='success',
+                level='info',
+                platform=platform,
+                user_id=user_id,
+                user_name=sender_name,
+                role='assistant',
+                runner_name='local-workflow',
+            )
+        except Exception as e:
+            ap.logger.error(f'Failed to record reply log: {e}')
+
+
+class LLMCallMonitor:
+    """Context manager for monitoring LLM calls in workflow"""
+
+    def __init__(
+        self,
+        ap: app.Application,
+        query,
+        bot_id: str,
+        bot_name: str,
+        workflow_id: str,
+        workflow_name: str,
+        node_name: str,
+        model_name: str,
+        context_vars: dict | None = None,
+    ):
+        self.ap = ap
+        self.query = query
+        self.bot_id = bot_id
+        self.bot_name = bot_name
+        self.workflow_id = workflow_id
+        self.workflow_name = workflow_name
+        self.node_name = node_name
+        self.model_name = model_name
+        self.context_vars = context_vars
+        self.start_time = None
+        self.input_tokens = 0
+        self.output_tokens = 0
+
+    async def __aenter__(self):
+        self.start_time = time.time()
+        return self
+
+    async def __aexit__(self, exc_type, exc_val, exc_tb):
+        duration_ms = int((time.time() - self.start_time) * 1000) if self.start_time else 0
+
+        if exc_type is not None:
+            await WorkflowMonitoringHelper.record_llm_call_log(
+                ap=self.ap,
+                query=self.query,
+                workflow_id=self.workflow_id,
+                workflow_name=self.workflow_name,
+                node_name=self.node_name,
+                model_name=self.model_name,
+                input_tokens=self.input_tokens,
+                output_tokens=self.output_tokens,
+                duration_ms=duration_ms,
+                status='error',
+                error_message=str(exc_val) if exc_val else None,
+                bot_name=self.bot_name,
+                context_vars=self.context_vars,
+            )
+        else:
+            await WorkflowMonitoringHelper.record_llm_call_log(
+                ap=self.ap,
+                query=self.query,
+                workflow_id=self.workflow_id,
+                workflow_name=self.workflow_name,
+                node_name=self.node_name,
+                model_name=self.model_name,
+                input_tokens=self.input_tokens,
+                output_tokens=self.output_tokens,
+                duration_ms=duration_ms,
+                status='success',
+                bot_name=self.bot_name,
+                context_vars=self.context_vars,
+            )
+
+        return False

src/langbot/pkg/workflow/node.py

@@ -0,0 +1,164 @@
+"""Workflow node base class and decorators"""
+
+from __future__ import annotations
+
+import abc
+from typing import Any, Callable, Optional, TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from .entities import ExecutionContext
+    from ..core import app
+
+
+class WorkflowNode(abc.ABC):
+    """Base class for all workflow nodes.
+
+    Node metadata (inputs, outputs, config schema, label, icon, etc.) is
+    defined exclusively in YAML files under templates/metadata/nodes/.
+    Python subclasses only provide execution logic and runtime behaviour.
+    """
+
+    # Set by @workflow_node decorator
+    type_name: str = ''
+
+    # Category is kept as a fallback for registry when YAML is missing
+    category: str = 'misc'
+
+    # Pipeline config reuse (referenced by registry merge logic)
+    config_schema_source: Optional[str] = None
+    config_stages: list[str] = []
+
+    def __init__(self, node_id: str, config: dict[str, Any], ap: Optional['app.Application'] = None):
+        """Initialize node with ID and configuration"""
+        self.node_id = node_id
+        self.config = config
+        self.ap = ap
+
+    @abc.abstractmethod
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        """Execute the node logic.
+
+        Args:
+            inputs: Input data from connected nodes
+            context: Execution context with workflow state
+
+        Returns:
+            Dictionary of output values
+        """
+        pass
+
+    # ------------------------------------------------------------------
+    # Validation helpers — metadata is resolved from the registry at
+    # runtime so that YAML remains the single source of truth.
+    # ------------------------------------------------------------------
+
+    async def validate_inputs(self, inputs: dict[str, Any]) -> list[str]:
+        """Validate input data against YAML port definitions.
+
+        Returns:
+            List of validation error messages (empty if valid)
+        """
+        metadata = self._get_metadata()
+        if metadata is None:
+            return []
+
+        errors: list[str] = []
+        for port in metadata.get('inputs', []):
+            if port.get('required', True) and port.get('name') and port['name'] not in inputs:
+                errors.append(f"Missing required input: {port['name']}")
+        return errors
+
+    async def validate_config(self) -> list[str]:
+        """Validate node configuration against YAML config schema.
+
+        Returns:
+            List of validation error messages (empty if valid)
+        """
+        metadata = self._get_metadata()
+        if metadata is None:
+            return []
+
+        errors: list[str] = []
+        for cfg in metadata.get('config', []):
+            name = cfg.get('name', '')
+            if not name:
+                continue
+            required = cfg.get('required', False)
+            cfg_type = cfg.get('type', 'string')
+
+            if required and name not in self.config:
+                errors.append(f'Missing required config: {name}')
+            elif name in self.config:
+                value = self.config[name]
+                # Type validation
+                if cfg_type == 'integer' and not isinstance(value, int):
+                    errors.append(f'Config {name} must be an integer')
+                elif cfg_type == 'number' and not isinstance(value, (int, float)):
+                    errors.append(f'Config {name} must be a number')
+                elif cfg_type == 'boolean' and not isinstance(value, bool):
+                    errors.append(f'Config {name} must be a boolean')
+                # Range validation
+                min_val = cfg.get('min_value')
+                max_val = cfg.get('max_value')
+                if min_val is not None and isinstance(value, (int, float)):
+                    if value < min_val:
+                        errors.append(f'Config {name} must be >= {min_val}')
+                if max_val is not None and isinstance(value, (int, float)):
+                    if value > max_val:
+                        errors.append(f'Config {name} must be <= {max_val}')
+        return errors
+
+    def get_config(self, key: str, default: Any = None) -> Any:
+        """Get configuration value with default"""
+        return self.config.get(key, default)
+
+    def _get_metadata(self) -> Optional[dict[str, Any]]:
+        """Retrieve YAML metadata for this node from the registry."""
+        from .registry import NodeTypeRegistry
+        registry = NodeTypeRegistry.instance()
+        return registry.get_metadata(self.type_name)
+
+    @classmethod
+    def to_schema(cls) -> dict[str, Any]:
+        """Return a schema dict for this node type.
+
+        This is used by tests and tooling to inspect node capabilities.
+        """
+        from .registry import NodeTypeRegistry
+        registry = NodeTypeRegistry.instance()
+        metadata = registry.get_metadata(cls.type_name)
+        if metadata:
+            return registry._metadata_to_schema(metadata)
+        # Fallback: build a minimal schema from class attributes
+        return {
+            'type': f'{cls.category}.{cls.type_name}' if cls.type_name else cls.type_name,
+            'category': cls.category,
+            'label': getattr(cls, 'name', cls.type_name),
+            'description': getattr(cls, 'description', ''),
+            'inputs': [],
+            'outputs': [],
+            'config_schema': [],
+        }
+
+
+# ------------------------------------------------------------------
+# Decorator for setting type_name attribute
+# ------------------------------------------------------------------
+
+
+def workflow_node(type_name: str) -> Callable[[type[WorkflowNode]], type[WorkflowNode]]:
+    """Decorator to set the type_name attribute on a workflow node class.
+
+    Usage:
+        @workflow_node('llm_call')
+        class LLMCallNode(WorkflowNode):
+            ...
+
+    The actual registration is now handled by the discovery engine.
+    """
+
+    def decorator(cls: type[WorkflowNode]) -> type[WorkflowNode]:
+        cls.type_name = type_name
+        return cls
+
+    return decorator

src/langbot/pkg/workflow/nodes/__init__.py

@@ -0,0 +1 @@
+

src/langbot/pkg/workflow/nodes/call_pipeline.py

@@ -0,0 +1,263 @@
+"""Call Pipeline Node - invoke an existing pipeline
+
+Node metadata is loaded from: ../../templates/metadata/nodes/call_pipeline.yaml
+"""
+
+from __future__ import annotations
+
+from typing import Any, Optional
+
+import pydantic
+
+import langbot_plugin.api.definition.abstract.platform.adapter as abstract_platform_adapter
+import langbot_plugin.api.definition.abstract.platform.event_logger as abstract_event_logger
+import langbot_plugin.api.entities.builtin.pipeline.query as pipeline_query
+import langbot_plugin.api.entities.builtin.platform.entities as platform_entities
+import langbot_plugin.api.entities.builtin.platform.events as platform_events
+import langbot_plugin.api.entities.builtin.platform.message as platform_message
+import langbot_plugin.api.entities.builtin.provider.session as provider_session
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+
+
+class _NoOpEventLogger(abstract_event_logger.AbstractEventLogger):
+    """No-op event logger for workflow pipeline adapter."""
+
+    async def info(
+        self,
+        text: str,
+        images: Optional[list[platform_message.Image]] = None,
+        message_session_id: Optional[str] = None,
+        no_throw: bool = True,
+    ):
+        pass
+
+    async def debug(
+        self,
+        text: str,
+        images: Optional[list[platform_message.Image]] = None,
+        message_session_id: Optional[str] = None,
+        no_throw: bool = True,
+    ):
+        pass
+
+    async def warning(
+        self,
+        text: str,
+        images: Optional[list[platform_message.Image]] = None,
+        message_session_id: Optional[str] = None,
+        no_throw: bool = True,
+    ):
+        pass
+
+    async def error(
+        self,
+        text: str,
+        images: Optional[list[platform_message.Image]] = None,
+        message_session_id: Optional[str] = None,
+        no_throw: bool = True,
+    ):
+        pass
+
+@workflow_node('call_pipeline')
+class CallPipelineNode(WorkflowNode):
+    """Call pipeline node - invoke an existing pipeline"""
+
+    category = 'action'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        if not self.ap:
+            raise RuntimeError('Application instance not available — cannot call pipeline')
+
+        raw_query = inputs.get('query', '')
+        query_text = str(raw_query or inputs.get('input') or '')
+        pipeline_ref = str(self.get_config('pipeline_uuid', '') or '').strip()
+
+        if not pipeline_ref:
+            raise ValueError('No pipeline configured for call pipeline node')
+
+        pipeline_data = await self.ap.pipeline_service.get_pipeline(pipeline_ref)
+        if pipeline_data is None:
+            pipeline_data = await self.ap.pipeline_service.get_pipeline_by_name(pipeline_ref)
+        if pipeline_data is None:
+            raise ValueError(f'Pipeline not found: {pipeline_ref}')
+
+        pipeline_uuid = str(pipeline_data.get('uuid', '') or '')
+        if not pipeline_uuid:
+            raise ValueError(f'Pipeline UUID missing for: {pipeline_ref}')
+
+        runtime_pipeline = await self.ap.pipeline_mgr.get_pipeline_by_uuid(pipeline_uuid)
+        if runtime_pipeline is None:
+            raise ValueError(f'Runtime pipeline not loaded: {pipeline_uuid}')
+
+        adapter = _WorkflowPipelineCaptureAdapter(context=context)
+        adapter.bot_account_id = 'workflow-call-pipeline'
+
+        message_event = self._build_message_event(query_text, context)
+        message_chain = message_event.message_chain
+        launcher_type = (
+            provider_session.LauncherTypes.GROUP
+            if context.message_context and context.message_context.is_group
+            else provider_session.LauncherTypes.PERSON
+        )
+        launcher_id = context.session_id or context.execution_id
+        sender_id = (
+            context.message_context.sender_id
+            if context.message_context and context.message_context.sender_id
+            else context.user_id or f'workflow_{context.execution_id}'
+        )
+
+        query = pipeline_query.Query(
+            bot_uuid=context.bot_id,
+            query_id=-1,
+            launcher_type=launcher_type,
+            launcher_id=launcher_id,
+            sender_id=sender_id,
+            message_event=message_event,
+            message_chain=message_chain,
+            variables={
+                '_called_from_workflow': True,
+                '_workflow_execution_id': context.execution_id,
+                '_workflow_id': context.workflow_id,
+                **dict(context.variables or {}),
+            },
+            resp_messages=[],
+            resp_message_chain=[],
+            adapter=adapter,
+            pipeline_uuid=pipeline_uuid,
+        )
+
+        await runtime_pipeline.run(query)
+
+        response_text = adapter.get_last_text_response()
+        result = {
+            'pipeline_uuid': pipeline_uuid,
+            'pipeline_name': pipeline_data.get('name', ''),
+            'responses': adapter.responses,
+            'query_text': query_text,
+        }
+
+        return {'response': response_text, 'result': result}
+
+    def _build_message_event(
+        self,
+        query_text: str,
+        context: ExecutionContext,
+    ) -> platform_events.MessageEvent:
+        message_chain_data = context.trigger_data.get('message_chain') or context.trigger_data.get('message', [])
+        if isinstance(message_chain_data, list) and message_chain_data:
+            message_chain = platform_message.MessageChain.model_validate(message_chain_data)
+        else:
+            message_chain = platform_message.MessageChain([platform_message.Plain(text=query_text)])
+
+        if context.message_context and context.message_context.is_group:
+            group = platform_entities.Group(
+                id=context.message_context.group_id or context.session_id or 'workflow_group',
+                name=context.message_context.raw_message.get('group_name', 'Workflow Group') if context.message_context.raw_message else 'Workflow Group',
+                permission=platform_entities.Permission.Member,
+            )
+            sender = platform_entities.GroupMember(
+                id=context.message_context.sender_id,
+                member_name=context.message_context.sender_name or 'Workflow User',
+                permission=platform_entities.Permission.Member,
+                group=group,
+            )
+            return platform_events.GroupMessage(
+                sender=sender,
+                message_chain=message_chain,
+                time=context.message_context.raw_message.get('time') if context.message_context.raw_message else None,
+            )
+
+        sender = platform_entities.Friend(
+            id=context.message_context.sender_id if context.message_context else context.user_id or 'workflow_user',
+            nickname=context.message_context.sender_name if context.message_context else 'Workflow User',
+            remark=context.message_context.sender_name if context.message_context else 'Workflow User',
+        )
+        return platform_events.FriendMessage(
+            sender=sender,
+            message_chain=message_chain,
+            time=context.message_context.raw_message.get('time')
+            if context.message_context and context.message_context.raw_message
+            else None,
+        )
+
+class _WorkflowPipelineCaptureAdapter(abstract_platform_adapter.AbstractMessagePlatformAdapter):
+    """Adapter to capture pipeline responses for workflow execution."""
+
+    class Config:
+        arbitrary_types_allowed = True
+
+    responses: list[dict[str, Any]] = []
+    context: Optional[ExecutionContext] = pydantic.Field(default=None, exclude=True)
+
+    def __init__(self, context: ExecutionContext):
+        super().__init__(config={}, logger=_NoOpEventLogger(), context=context)
+        self.responses = []
+
+    async def send_message(self, target_type: str, target_id: str, message: platform_message.MessageChain):
+        payload = {
+            'type': 'send',
+            'target_type': target_type,
+            'target_id': target_id,
+            'content': str(message),
+            'message_chain': message.model_dump(),
+        }
+        self.responses.append(payload)
+        return payload
+
+    async def reply_message(
+        self,
+        message_source: platform_events.MessageEvent,
+        message: platform_message.MessageChain,
+        quote_origin: bool = False,
+    ):
+        payload = {
+            'type': 'reply',
+            'content': str(message),
+            'message_chain': message.model_dump(),
+            'quote_origin': quote_origin,
+        }
+        self.responses.append(payload)
+        return payload
+
+    async def reply_message_chunk(
+        self,
+        message_source: platform_events.MessageEvent,
+        bot_message: dict,
+        message: platform_message.MessageChain,
+        quote_origin: bool = False,
+        is_final: bool = False,
+    ):
+        payload = {
+            'type': 'reply_chunk',
+            'content': str(message),
+            'message_chain': message.model_dump(),
+            'quote_origin': quote_origin,
+            'is_final': is_final,
+        }
+        self.responses.append(payload)
+        return payload
+
+    async def create_message_card(self, message_id, event: platform_events.MessageEvent) -> bool:
+        return False
+
+    def register_listener(self, event_type, callback):
+        return None
+
+    def unregister_listener(self, event_type, callback):
+        return None
+
+    async def run_async(self):
+        return None
+
+    async def is_stream_output_supported(self) -> bool:
+        return False
+
+    async def kill(self) -> bool:
+        return True
+
+    def get_last_text_response(self) -> str:
+        if not self.responses:
+            return ''
+        return str(self.responses[-1].get('content', '') or '')

src/langbot/pkg/workflow/nodes/call_workflow.py

@@ -0,0 +1,85 @@
+"""Call Workflow Node - invoke an existing workflow
+
+Node metadata is loaded from: ../../templates/metadata/nodes/call_workflow.yaml
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+
+from ..node import WorkflowNode, workflow_node
+
+
+@workflow_node('call_workflow')
+class CallWorkflowNode(WorkflowNode):
+    """Call workflow node - invoke an existing workflow"""
+
+    category = 'action'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        if not self.ap:
+            raise RuntimeError('Application instance not available — cannot call workflow')
+
+        # Get workflow reference from config
+        workflow_ref = str(self.get_config('workflow_uuid', '') or '').strip()
+        if not workflow_ref:
+            raise ValueError('No workflow configured for call workflow node')
+
+        # Get workflow definition from service
+        workflow_data = await self.ap.workflow_service.get_workflow(workflow_ref)
+        if workflow_data is None:
+            raise ValueError(f'Workflow not found: {workflow_ref}')
+
+        workflow_uuid = str(workflow_data.get('uuid', '') or '')
+        if not workflow_uuid:
+            raise ValueError(f'Workflow UUID missing for: {workflow_ref}')
+
+        # Build variables to pass to the called workflow
+        variables = dict(inputs.get('variables', {}) or {})
+
+        # Inherit current workflow variables if configured
+        if self.get_config('inherit_variables', True):
+            for key, value in (context.variables or {}).items():
+                if key not in variables:
+                    variables[key] = value
+
+        # Add context markers for debugging
+        variables['_called_from_workflow'] = True
+        variables['_parent_workflow_id'] = context.workflow_id
+        variables['_parent_execution_id'] = context.execution_id
+
+        # Execute the workflow
+        execution_id = await self.ap.workflow_service.execute_workflow(
+            workflow_uuid=workflow_uuid,
+            trigger_type='workflow_call',
+            trigger_data={
+                'variables': variables,
+                'parent_execution_id': context.execution_id,
+            },
+            session_id=context.session_id,
+            user_id=context.user_id,
+            bot_id=context.bot_id,
+        )
+
+        # Get execution result
+        execution = await self.ap.workflow_service.get_execution(execution_id)
+        if execution is None:
+            raise ValueError(f'Execution result not found: {execution_id}')
+
+        # Build result
+        result = {
+            'workflow_uuid': workflow_uuid,
+            'workflow_name': workflow_data.get('name', ''),
+            'execution_id': execution_id,
+            'status': execution.get('status', 'unknown'),
+            'variables': execution.get('variables', {}),
+            'error': execution.get('error'),
+        }
+
+        return {
+            'result': result,
+            'status': execution.get('status', 'unknown'),
+            'error': execution.get('error'),
+        }

src/langbot/pkg/workflow/nodes/code_executor.py

@@ -0,0 +1,156 @@
+"""Code Executor Node - run Python or JavaScript code
+
+Node metadata is loaded from: ../../templates/metadata/nodes/code_executor.yaml
+"""
+
+from __future__ import annotations
+
+import ast
+import io
+import logging
+import sys
+import threading
+from typing import Any
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+
+logger = logging.getLogger(__name__)
+
+# 危险的内置函数和模块黑名单
+_DANGEROUS_BUILTINS = {
+    '__import__', 'eval', 'exec', 'compile', 'open', 'file',
+    'input', 'exit', 'quit', 'globals', 'locals', 'vars',
+    'dir', 'help', 'breakpoint',
+}
+
+# 允许的安全内置函数
+_SAFE_BUILTINS = {
+    'abs': abs, 'all': all, 'any': any, 'bin': bin, 'bool': bool,
+    'bytearray': bytearray, 'bytes': bytes, 'callable': callable,
+    'chr': chr, 'complex': complex, 'dict': dict, 'divmod': divmod,
+    'enumerate': enumerate, 'filter': filter, 'float': float,
+    'format': format, 'frozenset': frozenset, 'hash': hash,
+    'hex': hex, 'int': int, 'isinstance': isinstance, 'issubclass': issubclass,
+    'iter': iter, 'len': len, 'list': list, 'map': map, 'max': max,
+    'min': min, 'next': next, 'object': object, 'oct': oct, 'ord': ord,
+    'pow': pow, 'print': print, 'range': range, 'repr': repr,
+    'reversed': reversed, 'round': round, 'set': set, 'slice': slice,
+    'sorted': sorted, 'str': str, 'sum': sum, 'tuple': tuple,
+    'type': type, 'zip': zip,
+}
+
+
+def _check_code_safety(code: str) -> list[str]:
+    """检查代码中是否包含危险操作"""
+    warnings = []
+    try:
+        tree = ast.parse(code)
+        for node in ast.walk(tree):
+            # 检查 import 语句
+            if isinstance(node, (ast.Import, ast.ImportFrom)):
+                warnings.append('Import statements are not allowed')
+            # 检查危险函数调用
+            if isinstance(node, ast.Call):
+                if isinstance(node.func, ast.Name) and node.func.id in _DANGEROUS_BUILTINS:
+                    warnings.append(f'Dangerous function call: {node.func.id}')
+                # 检查 __import__ 通过 getattr 调用
+                if isinstance(node.func, ast.Attribute):
+                    if node.func.attr in ('__import__', 'eval', 'exec', 'open', 'file'):
+                        warnings.append(f'Dangerous attribute access: {node.func.attr}')
+    except SyntaxError as e:
+        warnings.append(f'Syntax error in code: {e}')
+    return warnings
+
+
+class _ExecutionTimeoutError(Exception):
+    """执行超时错误"""
+    pass
+
+
+def _run_with_timeout(func, timeout: float = 10.0):
+    """带超时限制的函数执行"""
+    result = [None]
+    error = [None]
+
+    def _target():
+        try:
+            result[0] = func()
+        except Exception as e:
+            error[0] = e
+
+    thread = threading.Thread(target=_target)
+    thread.daemon = True
+    thread.start()
+    thread.join(timeout)
+
+    if thread.is_alive():
+        raise _ExecutionTimeoutError(f'Code execution timed out after {timeout} seconds')
+
+    if error[0]:
+        raise error[0]
+
+    return result[0]
+
+
+@workflow_node('code_executor')
+class CodeExecutorNode(WorkflowNode):
+    """Code executor node - run Python or JavaScript code"""
+
+    category = 'process'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        code = self.get_config('code', '')
+        language = self.get_config('language', 'python')
+        timeout = self.get_config('timeout', 10)
+
+        # 限制最大超时时间
+        timeout = min(max(timeout, 1), 30)
+
+        if not code:
+            return {'output': None, 'console': '', 'error': 'No code provided'}
+
+        if language == 'python':
+            return await self._execute_python(code, inputs, context, timeout)
+        else:
+            return await self._execute_javascript(code, inputs, context)
+
+    async def _execute_python(self, code: str, inputs: dict[str, Any], context: ExecutionContext, timeout: float) -> dict[str, Any]:
+        # 安全检查
+        warnings = _check_code_safety(code)
+        if warnings:
+            logger.warning('Code safety warnings: %s', warnings)
+            return {'output': None, 'console': '', 'error': '; '.join(warnings)}
+
+        stdout_capture = io.StringIO()
+        old_stdout = sys.stdout
+
+        def _exec_code():
+            nonlocal stdout_capture
+            sys.stdout = stdout_capture
+            try:
+                # 使用更安全的执行方式
+                compiled = compile(code, '<workflow>', 'exec')
+                safe_globals = {
+                    '__builtins__': _SAFE_BUILTINS,
+                    '__name__': '__workflow_sandbox__',
+                }
+                local_vars = {'inputs': inputs, 'output': None}
+                exec(compiled, safe_globals, local_vars)
+                return local_vars.get('output')
+            finally:
+                sys.stdout = old_stdout
+
+        try:
+            output = _run_with_timeout(_exec_code, timeout)
+            console_output = stdout_capture.getvalue()
+            return {'output': output, 'console': console_output, 'error': None}
+        except _ExecutionTimeoutError as e:
+            logger.error('Code execution timeout: %s', e)
+            return {'output': None, 'console': stdout_capture.getvalue(), 'error': str(e)}
+        except Exception as e:
+            logger.error('Code execution error: %s', e)
+            return {'output': None, 'console': stdout_capture.getvalue(), 'error': f'{type(e).__name__}: {e}'}
+
+    async def _execute_javascript(self, code: str, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        return {'output': None, 'console': '', 'error': 'JavaScript execution is not implemented'}

src/langbot/pkg/workflow/nodes/condition.py

@@ -0,0 +1,125 @@
+"""Condition Node - branch based on condition
+
+Node metadata is loaded from: ../../templates/metadata/nodes/condition.yaml
+"""
+
+from __future__ import annotations
+
+import logging
+import re
+import signal
+from typing import Any
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+from ..safe_eval import safe_eval_with_vars
+
+logger = logging.getLogger(__name__)
+
+# 正则表达式超时限制（秒）
+_REGEX_TIMEOUT = 2
+
+
+class _RegexTimeoutError(Exception):
+    """正则表达式超时错误"""
+    pass
+
+
+def _handle_timeout(signum, frame):
+    """超时信号处理"""
+    raise _RegexTimeoutError('Regex match timed out')
+
+
+def _safe_regex_match(pattern: str, text: str) -> tuple[bool, str]:
+    """安全地执行正则表达式匹配，带有超时限制"""
+    # 设置超时信号
+    old_handler = signal.signal(signal.SIGALRM, _handle_timeout)
+    signal.setitimer(signal.ITIMER_REAL, _REGEX_TIMEOUT)
+
+    try:
+        result = bool(re.match(pattern, str(text)))
+        return result, ''
+    except _RegexTimeoutError:
+        logger.warning('Regex match timed out for pattern: %s', pattern[:50])
+        return False, 'Regex match timed out'
+    except re.error as e:
+        logger.warning('Invalid regex pattern: %s', e)
+        return False, f'Invalid regex: {e}'
+    finally:
+        signal.setitimer(signal.ITIMER_REAL, 0)
+        signal.signal(signal.SIGALRM, old_handler)
+
+
+@workflow_node('condition')
+class ConditionNode(WorkflowNode):
+    """Condition node - branch based on condition"""
+
+    category = 'control'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        condition_type = self.get_config('condition_type', 'expression')
+        input_data = inputs.get('input')
+
+        result = False
+
+        if condition_type == 'expression':
+            expression = self.get_config('expression', 'false')
+            result = await self._evaluate_expression(expression, input_data, context)
+        elif condition_type == 'comparison':
+            result = await self._evaluate_comparison(input_data, context)
+        elif condition_type == 'contains':
+            left = self.get_config('left_value', '')
+            right = self.get_config('right_value', '')
+            result = right in left
+        elif condition_type == 'empty':
+            result = not bool(input_data)
+        elif condition_type == 'regex':
+            left = self.get_config('left_value', '')
+            pattern = self.get_config('right_value', '')
+            result, error = _safe_regex_match(pattern, left)
+            if error:
+                return {'true': None, 'false': input_data, 'error': error}
+
+        if result:
+            return {'true': input_data, 'false': None}
+        else:
+            return {'true': None, 'false': input_data}
+
+    async def _evaluate_expression(self, expression: str, data: Any, context: ExecutionContext) -> bool:
+        try:
+            local_vars = {'input': data, 'data': data, 'variables': context.variables}
+            return bool(safe_eval_with_vars(expression, local_vars))
+        except Exception as e:
+            logger.warning('Expression evaluation error: %s', e)
+            return False
+
+    async def _evaluate_comparison(self, data: Any, context: ExecutionContext) -> bool:
+        left = self.get_config('left_value', '')
+        right = self.get_config('right_value', '')
+        operator = self.get_config('operator', '==')
+
+        try:
+            left_num = float(left)
+            right_num = float(right)
+
+            if operator == '==':
+                return left_num == right_num
+            elif operator == '!=':
+                return left_num != right_num
+            elif operator == '>':
+                return left_num > right_num
+            elif operator == '<':
+                return left_num < right_num
+            elif operator == '>=':
+                return left_num >= right_num
+            elif operator == '<=':
+                return left_num <= right_num
+        except ValueError:
+            if operator == '==':
+                return left == right
+            elif operator == '!=':
+                return left != right
+            elif operator in ('>', '<', '>=', '<='):
+                return False
+
+        return False

src/langbot/pkg/workflow/nodes/coze_bot.py

@@ -0,0 +1,39 @@
+"""Coze Bot Node - call Coze API bot
+
+Node metadata is loaded from: ../../templates/metadata/nodes/coze_bot.yaml
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+
+@workflow_node('coze_bot')
+class CozeBotNode(WorkflowNode):
+    """Coze bot node - call Coze API bot"""
+
+    category = 'integration'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        api_key = self.get_config('api_key', '')
+        bot_id = self.get_config('bot_id', '')
+        api_base = self.get_config('api_base', 'https://api.coze.cn')
+        query = inputs.get('query', '')
+        conversation_id = inputs.get('conversation_id')
+
+        # Safe API key truncation
+        masked_key = f'{api_key[:4]}...{api_key[-4:]}' if len(api_key) > 8 else '***' if api_key else ''
+
+        return {
+            'answer': '',
+            'conversation_id': conversation_id,
+            'success': False,
+            '_debug': {
+                'api_key': masked_key,
+                'bot_id': bot_id,
+                'api_base': api_base,
+                'query': query,
+            },
+        }

src/langbot/pkg/workflow/nodes/cron_trigger.py

@@ -0,0 +1,26 @@
+"""Cron Trigger Node - triggers workflow on schedule
+
+Node metadata is loaded from: ../../templates/metadata/nodes/cron_trigger.yaml
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+
+@workflow_node('cron_trigger')
+class CronTriggerNode(WorkflowNode):
+    """Cron trigger node - triggers workflow on schedule"""
+
+    category = 'trigger'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        from datetime import datetime
+
+        return {
+            'timestamp': datetime.now().isoformat(),
+            'schedule': self.get_config('cron', ''),
+            'context': context.trigger_data,
+        }

src/langbot/pkg/workflow/nodes/data_transform.py

@@ -0,0 +1,68 @@
+"""Data Transform Node - transform data using templates or JSONPath
+
+Node metadata is loaded from: ../../templates/metadata/nodes/data_transform.yaml
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+from ..safe_eval import safe_eval_with_vars
+
+@workflow_node('data_transform')
+class DataTransformNode(WorkflowNode):
+    """Data transform node - transform data using templates or JSONPath"""
+
+    category = 'process'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        data = inputs.get('data')
+        transform_type = self.get_config('transform_type', 'template')
+
+        if transform_type == 'template':
+            template = self.get_config('template', '')
+            result = self._apply_template(template, data, context)
+        elif transform_type == 'jsonpath':
+            expression = self.get_config('expression', '$')
+            result = self._apply_jsonpath(expression, data)
+        elif transform_type == 'expression':
+            expression = self.get_config('expression', '')
+            result = self._evaluate_expression(expression, data, context)
+        else:
+            result = data
+
+        return {'result': result}
+
+    def _apply_template(self, template: str, data: Any, context: ExecutionContext) -> str:
+        result = template
+        if isinstance(data, dict):
+            for key, value in data.items():
+                result = result.replace(f'{{{{data.{key}}}}}', str(value))
+        for key, value in context.variables.items():
+            result = result.replace(f'{{{{variables.{key}}}}}', str(value))
+        return result
+
+    def _apply_jsonpath(self, expression: str, data: Any) -> Any:
+        if expression == '$':
+            return data
+        if expression.startswith('$.'):
+            parts = expression[2:].split('.')
+            result = data
+            for part in parts:
+                if isinstance(result, dict):
+                    result = result.get(part)
+                elif isinstance(result, list) and part.isdigit():
+                    result = result[int(part)]
+                else:
+                    return None
+            return result
+        return data
+
+    def _evaluate_expression(self, expression: str, data: Any, context: ExecutionContext) -> Any:
+        local_vars = {'data': data, 'variables': context.variables}
+        try:
+            return safe_eval_with_vars(expression, local_vars)
+        except Exception:
+            return None

src/langbot/pkg/workflow/nodes/database_query.py

@@ -0,0 +1,38 @@
+"""Database Query Node - execute database queries
+
+Node metadata is loaded from: ../../templates/metadata/nodes/database_query.yaml
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+
+@workflow_node('database_query')
+class DatabaseQueryNode(WorkflowNode):
+    """Database query node - execute database queries"""
+
+    category = 'integration'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        connection_type = self.get_config('connection_type', 'postgresql')
+        query = self.get_config('query', '')
+        query_type = self.get_config('query_type', 'select')
+        timeout = self.get_config('timeout', 30)
+
+        parameters = inputs.get('parameters', {})
+
+        return {
+            'results': [],
+            'row_count': 0,
+            'success': False,
+            '_debug': {
+                'connection_type': connection_type,
+                'query': query,
+                'query_type': query_type,
+                'timeout': timeout,
+                'parameters': parameters,
+            },
+        }

src/langbot/pkg/workflow/nodes/dify_knowledge_query.py

@@ -0,0 +1,37 @@
+"""Dify Knowledge Query Node - query Dify knowledge base
+
+Node metadata is loaded from: ../../templates/metadata/nodes/dify_knowledge_query.yaml
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+
+@workflow_node('dify_knowledge_query')
+class DifyKnowledgeQueryNode(WorkflowNode):
+    """Dify knowledge base query node - query Dify knowledge base"""
+
+    category = 'integration'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        base_url = self.get_config('base_url', 'https://api.dify.ai/v1')
+        api_key = self.get_config('api_key', '')
+        dataset_id = self.get_config('dataset_id', '')
+        query = inputs.get('query', '')
+
+        # Safe API key truncation
+        masked_key = f'{api_key[:4]}...{api_key[-4:]}' if len(api_key) > 8 else '***' if api_key else ''
+
+        return {
+            'results': [],
+            'success': False,
+            '_debug': {
+                'base_url': base_url,
+                'api_key': masked_key,
+                'dataset_id': dataset_id,
+                'query': query,
+            },
+        }

src/langbot/pkg/workflow/nodes/dify_workflow.py

@@ -0,0 +1,39 @@
+"""Dify Workflow Node - call Dify service API
+
+Node metadata is loaded from: ../../templates/metadata/nodes/dify_workflow.yaml
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+
+@workflow_node('dify_workflow')
+class DifyWorkflowNode(WorkflowNode):
+    """Dify workflow node - call Dify service API"""
+
+    category = 'integration'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        base_url = self.get_config('base_url', 'https://api.dify.ai/v1')
+        api_key = self.get_config('api_key', '')
+        app_type = self.get_config('app_type', 'chat')
+        query = inputs.get('query', '')
+        conversation_id = inputs.get('conversation_id')
+
+        # Safe API key truncation
+        masked_key = f'{api_key[:4]}...{api_key[-4:]}' if len(api_key) > 8 else '***' if api_key else ''
+
+        return {
+            'answer': '',
+            'conversation_id': conversation_id,
+            'success': False,
+            '_debug': {
+                'base_url': base_url,
+                'api_key': masked_key,
+                'app_type': app_type,
+                'query': query,
+            },
+        }

src/langbot/pkg/workflow/nodes/end.py

@@ -0,0 +1,33 @@
+"""End Node - marks the end of workflow execution
+
+Node metadata is loaded from: ../../templates/metadata/nodes/end.yaml
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+
+@workflow_node('end')
+class EndNode(WorkflowNode):
+    """End node - marks the end of workflow execution"""
+
+    category = 'control'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        result = inputs.get('result')
+        output_format = self.get_config('output_format', 'passthrough')
+
+        if output_format == 'text':
+            return {'output': str(result)}
+        elif output_format == 'json':
+            import json
+
+            try:
+                return {'output': json.dumps(result, ensure_ascii=False)}
+            except Exception:
+                return {'output': str(result)}
+        else:
+            return {'output': result}

src/langbot/pkg/workflow/nodes/event_trigger.py

@@ -0,0 +1,28 @@
+"""Event Trigger Node - triggers workflow on system events
+
+Node metadata is loaded from: ../../templates/metadata/nodes/event_trigger.yaml
+"""
+
+from __future__ import annotations
+
+from datetime import datetime
+from typing import Any
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+
+@workflow_node('event_trigger')
+class EventTriggerNode(WorkflowNode):
+    """Event trigger node - triggers workflow on system events"""
+
+    category = 'trigger'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        # Safe access to trigger_data which may be None
+        trigger_data = context.trigger_data or {}
+
+        return {
+            'event_type': trigger_data.get('event_type', ''),
+            'event_data': trigger_data.get('event_data', {}),
+            'timestamp': trigger_data.get('timestamp', datetime.now().isoformat()),
+        }

src/langbot/pkg/workflow/nodes/http_request.py

@@ -0,0 +1,152 @@
+"""HTTP Request Node - make HTTP API calls
+
+Node metadata is loaded from: ../../templates/metadata/nodes/http_request.yaml
+"""
+
+from __future__ import annotations
+
+import ipaddress
+import logging
+from typing import Any
+from urllib.parse import urlparse
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+
+logger = logging.getLogger(__name__)
+
+# 内网地址黑名单
+_PRIVATE_NETWORKS = [
+    ipaddress.ip_network('10.0.0.0/8'),
+    ipaddress.ip_network('172.16.0.0/12'),
+    ipaddress.ip_network('192.168.0.0/16'),
+    ipaddress.ip_network('127.0.0.0/8'),
+    ipaddress.ip_network('169.254.0.0/16'),
+    ipaddress.ip_network('0.0.0.0/8'),
+    ipaddress.ip_network('::1/128'),
+    ipaddress.ip_network('fc00::/7'),
+    ipaddress.ip_network('fe80::/10'),
+]
+
+# 危险协议
+_DANGEROUS_SCHEMES = {'file', 'gopher', 'dict', 'ftp', 'telnet'}
+
+
+def _is_safe_url(url: str) -> tuple[bool, str]:
+    """检查 URL 是否安全（非内网地址）"""
+    try:
+        parsed = urlparse(url)
+    except Exception as e:
+        return False, f'Invalid URL: {e}'
+
+    # 检查协议
+    scheme = parsed.scheme.lower()
+    if scheme in _DANGEROUS_SCHEMES:
+        return False, f'Dangerous scheme: {scheme}'
+
+    if scheme not in ('http', 'https'):
+        return False, f'Unsupported scheme: {scheme}'
+
+    # 检查主机名
+    hostname = parsed.hostname
+    if not hostname:
+        return False, 'Missing hostname'
+
+    # 检查是否是危险主机名
+    dangerous_hosts = {'localhost', '0.0.0.0', '127.0.0.1', '::1'}
+    if hostname.lower() in dangerous_hosts:
+        return False, f'Dangerous hostname: {hostname}'
+
+    # 解析 IP 地址并检查是否在私有网络
+    try:
+        ip = ipaddress.ip_address(hostname)
+        for network in _PRIVATE_NETWORKS:
+            if ip in network:
+                return False, f'Private network address: {ip}'
+    except ValueError:
+        # 不是 IP 地址，尝试 DNS 解析检查
+        # 这里可以添加 DNS 解析检查，但为了避免复杂性，暂时跳过
+        pass
+
+    return True, ''
+
+
+@workflow_node('http_request')
+class HTTPRequestNode(WorkflowNode):
+    """HTTP request node - make HTTP API calls"""
+
+    category = 'action'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        import aiohttp
+
+        url = self.get_config('url', '')
+        method = self.get_config('method', 'GET').upper()
+        timeout = self.get_config('timeout', 30)
+        content_type = self.get_config('content_type', 'application/json')
+        allow_redirects = self.get_config('allow_redirects', False)  # 默认禁用重定向
+
+        # 限制超时时间
+        timeout = min(max(timeout, 1), 120)
+
+        if not url:
+            return {'response': None, 'status_code': 0, 'headers': {}, 'error': 'No URL provided'}
+
+        # 安全检查 URL
+        is_safe, error_msg = _is_safe_url(url)
+        if not is_safe:
+            logger.warning('Unsafe URL blocked: %s - %s', url, error_msg)
+            return {'response': None, 'status_code': 0, 'headers': {}, 'error': f'Unsafe URL: {error_msg}'}
+
+        # 验证 HTTP 方法
+        allowed_methods = {'GET', 'POST', 'PUT', 'DELETE', 'PATCH', 'HEAD', 'OPTIONS'}
+        if method not in allowed_methods:
+            return {'response': None, 'status_code': 0, 'headers': {}, 'error': f'Invalid method: {method}'}
+
+        # 创建 headers 副本，避免修改输入
+        headers = dict(inputs.get('headers', {}))
+        headers['Content-Type'] = content_type
+
+        auth_type = self.get_config('auth_type', 'none')
+        auth_config = self.get_config('auth_config', {})
+
+        if auth_type == 'bearer':
+            headers['Authorization'] = f'Bearer {auth_config.get("token", "")}'
+        elif auth_type == 'api_key':
+            header_name = auth_config.get('header', 'X-API-Key')
+            headers[header_name] = auth_config.get('key', '')
+
+        body = inputs.get('body')
+
+        logger.info('HTTP %s %s (timeout=%s)', method, url, timeout)
+
+        try:
+            async with aiohttp.ClientSession() as session:
+                async with session.request(
+                    method=method,
+                    url=url,
+                    json=body if content_type == 'application/json' else None,
+                    data=body if content_type != 'application/json' else None,
+                    headers=headers,
+                    timeout=aiohttp.ClientTimeout(total=timeout),
+                    allow_redirects=allow_redirects,
+                ) as response:
+                    try:
+                        response_data = await response.json()
+                    except Exception:
+                        response_data = await response.text()
+
+                    logger.info('HTTP %s %s -> %d', method, url, response.status)
+
+                    return {
+                        'response': response_data,
+                        'status_code': response.status,
+                        'headers': dict(response.headers),
+                        'error': None,
+                    }
+        except aiohttp.ClientError as e:
+            logger.error('HTTP request failed: %s', e)
+            return {'response': None, 'status_code': 0, 'headers': {}, 'error': f'HTTP error: {e}'}
+        except Exception as e:
+            logger.error('HTTP request unexpected error: %s', e)
+            return {'response': None, 'status_code': 0, 'headers': {}, 'error': f'Unexpected error: {e}'}

src/langbot/pkg/workflow/nodes/iterator.py

@@ -0,0 +1,32 @@
+"""Iterator Node - Dify-style iterator for processing array items"""
+
+from __future__ import annotations
+
+from typing import Any
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+
+@workflow_node('iterator')
+class IteratorNode(WorkflowNode):
+    """Iterator node - iterate over array items one by one"""
+
+    category = 'control'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        items = inputs.get('items', [])
+        if not isinstance(items, list):
+            items = [items] if items else []
+
+        max_iterations = self.get_config('max_iterations', 1000)
+        items = items[:max_iterations]
+
+        return {
+            'item': items[0] if items else None,
+            'index': 0,
+            'is_first': True,
+            'is_last': len(items) <= 1,
+            'results': [],
+            'completed': len(items) == 0,
+            '_items': items,
+        }

src/langbot/pkg/workflow/nodes/knowledge_retrieval.py

@@ -0,0 +1,21 @@
+"""Knowledge Retrieval Node - search in knowledge base
+
+Node metadata is loaded from: ../../templates/metadata/nodes/knowledge_retrieval.yaml
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+
+@workflow_node('knowledge_retrieval')
+class KnowledgeRetrievalNode(WorkflowNode):
+    """Knowledge retrieval node - search in knowledge base"""
+
+    category = 'process'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        query = inputs.get('query', '')
+        return {'documents': [], 'citations': [], 'context': f'[Knowledge base search for: {query}]'}

src/langbot/pkg/workflow/nodes/langflow_flow.py

@@ -0,0 +1,37 @@
+"""Langflow Flow Node - call Langflow API
+
+Node metadata is loaded from: ../../templates/metadata/nodes/langflow_flow.yaml
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+
+@workflow_node('langflow_flow')
+class LangflowFlowNode(WorkflowNode):
+    """Langflow flow node - call Langflow API"""
+
+    category = 'integration'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        base_url = self.get_config('base_url', 'http://localhost:7860')
+        api_key = self.get_config('api_key', '')
+        flow_id = self.get_config('flow_id', '')
+        input_value = inputs.get('input_value', '')
+
+        # Safe API key truncation
+        masked_key = f'{api_key[:4]}...{api_key[-4:]}' if len(api_key) > 8 else '***' if api_key else ''
+
+        return {
+            'result': None,
+            'success': False,
+            '_debug': {
+                'base_url': base_url,
+                'api_key': masked_key,
+                'flow_id': flow_id,
+                'input_value': input_value,
+            },
+        }

src/langbot/pkg/workflow/nodes/llm_call.py

@@ -0,0 +1,829 @@
+"""LLM Call Node - invoke large language model with Agent capabilities.
+
+Supports:
+- Primary model with fallback models
+- Knowledge base retrieval with reranking
+- Max round context control
+- Streaming output
+"""
+
+from __future__ import annotations
+
+import json
+import logging
+import re
+import time
+from typing import Any, AsyncGenerator
+
+import langbot_plugin.api.entities.builtin.provider.message as provider_message
+import langbot_plugin.api.entities.builtin.rag.context as rag_context
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+from .. import monitoring_helper
+
+logger = logging.getLogger(__name__)
+
+# Pre-compiled regex patterns for CoT content removal (performance optimization)
+_THINK_PATTERNS = [
+    re.compile(r'<think>.*?</think>', re.DOTALL | re.IGNORECASE),
+    re.compile(r'<thought>.*?</thought>', re.DOTALL | re.IGNORECASE),
+    re.compile(r'<reasoning>.*?</reasoning>', re.DOTALL | re.IGNORECASE),
+    re.compile(r'<\u601d\u8003>.*?</\u601d\u8003>', re.DOTALL | re.IGNORECASE),
+    re.compile(r'<\u63a8\u7406>.*?</\u63a8\u7406>', re.DOTALL | re.IGNORECASE),
+]
+
+# Template variable regex
+_TEMPLATE_VAR_RE = re.compile(r'\{\{([^}]+)\}\}')
+
+
+@workflow_node('llm_call')
+class LLMCallNode(WorkflowNode):
+    """LLM call node - invoke large language model"""
+
+    category = 'process'
+
+    def _resolve_template(self, template: str, inputs: dict[str, Any], context: ExecutionContext) -> str:
+        """Resolve {{variable}} placeholders in a template string."""
+        if not template:
+            return ''
+
+        unresolved_vars = []
+
+        def replacer(match: re.Match) -> str:
+            expr = match.group(1).strip()
+            # Try inputs first
+            if expr in inputs:
+                return str(inputs[expr])
+            # Try context variables
+            if expr.startswith('variables.'):
+                var_name = expr[len('variables.'):]
+                return str(context.variables.get(var_name, ''))
+            # Try message context
+            if expr.startswith('message.') and context.message_context:
+                attr = expr[len('message.'):]
+                return str(getattr(context.message_context, attr, ''))
+            unresolved_vars.append(expr)
+            return match.group(0)  # leave unresolved
+
+        result = _TEMPLATE_VAR_RE.sub(replacer, template)
+
+        # Log warning for unresolved variables
+        if unresolved_vars:
+            logger.warning(
+                f'LLM call node {self.node_id}: unresolved template variables: {unresolved_vars}'
+            )
+
+        return result
+
+    def _remove_think_content(self, text: str) -> str:
+        """Remove CoT (Chain of Thought) thinking content from response."""
+        if not text:
+            return text
+
+        result = text
+        for pattern in _THINK_PATTERNS:
+            result = pattern.sub('', result)
+
+        return result.strip()
+
+    def _apply_content_filter(self, text: str) -> tuple[str, bool, str]:
+        """Apply content safety filter to text.
+
+        Returns:
+            (filtered_text, is_blocked, user_notice)
+        """
+        if not text or not self.ap:
+            return text, False, ''
+
+        # Check if content filter is enabled
+        safety_config = getattr(self.ap, 'pipeline_cfg', None)
+        if not safety_config:
+            return text, False, ''
+
+        # Check sensitive words
+        sensitive_words = []
+        try:
+            if hasattr(self.ap, 'sensitive_meta') and hasattr(self.ap.sensitive_meta, 'data'):
+                sensitive_words = self.ap.sensitive_meta.data.get('words', [])
+        except Exception as e:
+            logger.warning("Failed to load sensitive words from sensitive_meta: %s", e)
+            sensitive_words = []
+
+        if not sensitive_words:
+            return text, False, ''
+
+        found = False
+        filtered_text = text
+        for word in sensitive_words:
+            try:
+                matches = re.findall(word, filtered_text, re.IGNORECASE)
+                if matches:
+                    found = True
+                    mask_word = ''
+                    mask = '*'
+                    try:
+                        if hasattr(self.ap, 'sensitive_meta') and hasattr(self.ap.sensitive_meta, 'data'):
+                            mask_word = self.ap.sensitive_meta.data.get('mask_word', '')
+                            mask = self.ap.sensitive_meta.data.get('mask', '*')
+                    except Exception as e:
+                        # Keep default mask settings when sensitive metadata is unavailable or malformed.
+                        logger.debug(
+                            f'LLM call node {self.node_id}: failed to read sensitive mask config, using defaults: {e}'
+                        )
+
+                    for m in matches:
+                        if mask_word:
+                            filtered_text = filtered_text.replace(m, mask_word)
+                        else:
+                            filtered_text = filtered_text.replace(m, mask * len(m))
+            except re.error:
+                # Invalid regex pattern, skip
+                continue
+
+        if found:
+            return filtered_text, False, '消息中存在不合适的内容, 请修改'
+
+        return text, False, ''
+
+    # RAG combined prompt template (same as localagent.py)
+    RAG_COMBINED_PROMPT_TEMPLATE = """
+The following are relevant context entries retrieved from the knowledge base.
+Please use them to answer the user's message.
+Respond in the same language as the user's input.
+
+<context>
+{rag_context}
+</context>
+
+<user_message>
+{user_message}
+</user_message>
+"""
+
+    def _build_system_prompt_with_format(self, base_prompt: str, output_format: str, json_schema: str) -> str:
+        """Build system prompt with output format instructions."""
+        prompt = base_prompt
+
+        if output_format == 'json':
+            prompt += '\n\nPlease respond in valid JSON format.'
+            if json_schema:
+                prompt += f'\nFollow this JSON schema:\n{json_schema}'
+        elif output_format == 'markdown':
+            prompt += '\n\nPlease respond in Markdown format.'
+
+        return prompt
+
+    def _build_messages_from_prompt_array(
+        self,
+        prompt_array: list[dict],
+        inputs: dict[str, Any],
+        context: ExecutionContext,
+        output_format: str,
+        json_schema: str,
+    ) -> list[provider_message.Message]:
+        """Build messages list from prompt array (same format as pipeline).
+        
+        Each item in prompt_array is {role: str, content: str}.
+        Resolves template variables in content.
+        """
+        messages: list[provider_message.Message] = []
+        
+        for item in prompt_array:
+            role = item.get('role', 'user')
+            content = item.get('content', '')
+            
+            # Resolve template variables in content
+            resolved_content = self._resolve_template(content, inputs, context)
+            
+            # Apply format instructions to system prompt
+            if role == 'system':
+                resolved_content = self._build_system_prompt_with_format(
+                    resolved_content, output_format, json_schema
+                )
+            
+            messages.append(provider_message.Message(role=role, content=resolved_content))
+        
+        return messages
+
+    async def _get_model_candidates(self, model_uuid: str, fallback_models: list) -> list:
+        """Build ordered list of models to try: primary model + fallback models."""
+        candidates = []
+
+        # Primary model
+        if model_uuid:
+            try:
+                primary = await self.ap.model_mgr.get_model_by_uuid(model_uuid)
+                candidates.append(primary)
+            except ValueError:
+                logger.warning(f'[LLM:{self.node_id}] Primary model {model_uuid} not found')
+
+        # Fallback models
+        for fb_uuid in fallback_models:
+            try:
+                fb_model = await self.ap.model_mgr.get_model_by_uuid(fb_uuid)
+                candidates.append(fb_model)
+            except ValueError:
+                logger.warning(f'[LLM:{self.node_id}] Fallback model {fb_uuid} not found, skipping')
+
+        return candidates
+
+    async def _invoke_with_fallback(
+        self,
+        candidates: list,
+        messages: list,
+        funcs: list | None,
+        extra_args: dict,
+    ) -> tuple[Any, Any]:
+        """Try non-streaming invocation with sequential fallback. Returns (message, model_used)."""
+        last_error = None
+        for model in candidates:
+            try:
+                msg = await model.provider.invoke_llm(
+                    query=None,
+                    model=model,
+                    messages=messages,
+                    funcs=funcs if model.model_entity.abilities.__contains__('func_call') else [],
+                    extra_args=extra_args,
+                )
+                return msg, model
+            except Exception as e:
+                last_error = e
+                logger.warning(f'[LLM:{self.node_id}] Model {model.model_entity.name} failed: {e}, trying next...')
+        raise last_error or RuntimeError('No model candidates available')
+
+    async def _retrieve_knowledge(
+        self,
+        user_message_text: str,
+        knowledge_bases: list[str],
+        rerank_model_uuid: str,
+        rerank_top_k: int,
+    ) -> str:
+        """Retrieve from knowledge bases and optionally rerank results.
+        
+        Returns the enhanced user message text with RAG context, or original text if no results.
+        """
+        if not knowledge_bases or not user_message_text:
+            return user_message_text
+
+        all_results: list[rag_context.RetrievalResultEntry] = []
+
+        # Retrieve from each knowledge base
+        for kb_uuid in knowledge_bases:
+            try:
+                kb = await self.ap.rag_mgr.get_knowledge_base_by_uuid(kb_uuid)
+                if not kb:
+                    logger.warning(f'[LLM:{self.node_id}] Knowledge base {kb_uuid} not found, skipping')
+                    continue
+
+                result = await kb.retrieve(user_message_text, settings={})
+                if result:
+                    all_results.extend(result)
+            except Exception as e:
+                logger.warning(f'[LLM:{self.node_id}] Failed to retrieve from KB {kb_uuid}: {e}')
+
+        # Rerank step: re-score results using a rerank model if configured
+        if all_results and rerank_model_uuid:
+            try:
+                rerank_model = await self.ap.model_mgr.get_rerank_model_by_uuid(rerank_model_uuid)
+                
+                doc_texts = []
+                for entry in all_results:
+                    text = ' '.join(c.text for c in entry.content if c.type == 'text' and c.text)
+                    doc_texts.append(text)
+
+                doc_texts_capped = doc_texts[:64]  # Cap for reranker input
+                scores = await rerank_model.provider.invoke_rerank(
+                    model=rerank_model,
+                    query=user_message_text,
+                    documents=doc_texts_capped,
+                )
+
+                scored = sorted(scores, key=lambda x: x.get('relevance_score', 0), reverse=True)
+                top_indices = [s['index'] for s in scored[:rerank_top_k] if s['index'] < len(all_results)]
+                all_results = [all_results[i] for i in top_indices]
+
+                logger.info(
+                    f'[LLM:{self.node_id}] Rerank complete: {len(doc_texts)} docs -> top {len(all_results)} kept (top_k={rerank_top_k})'
+                )
+            except ValueError:
+                logger.warning(f'[LLM:{self.node_id}] Rerank model {rerank_model_uuid} not found, skipping rerank')
+            except Exception as e:
+                logger.warning(f'[LLM:{self.node_id}] Rerank failed, using original order: {e}')
+
+        # Build RAG context text
+        if all_results:
+            texts = []
+            idx = 1
+            for entry in all_results:
+                for content in entry.content:
+                    if content.type == 'text' and content.text is not None:
+                        texts.append(f'[{idx}] {content.text}')
+                        idx += 1
+            rag_context_text = '\n\n'.join(texts)
+            return self.RAG_COMBINED_PROMPT_TEMPLATE.format(
+                rag_context=rag_context_text,
+                user_message=user_message_text,
+            )
+
+        return user_message_text
+
+    def _build_messages_with_history(
+        self,
+        system_prompt: str,
+        user_message_text: str,
+        context: ExecutionContext,
+        max_round: int,
+    ) -> list[provider_message.Message]:
+        """Build messages list with conversation history up to max_round."""
+        messages: list[provider_message.Message] = []
+        
+        # Add system prompt
+        if system_prompt:
+            messages.append(provider_message.Message(role='system', content=system_prompt))
+
+        # Get conversation history from context
+        conversation_history = context.variables.get('_conversation_history', [])
+        
+        # Apply max_round limit (each round = 1 user + 1 assistant message)
+        if max_round > 0 and conversation_history:
+            # Keep only the last max_round * 2 messages (user + assistant pairs)
+            max_messages = max_round * 2
+            if len(conversation_history) > max_messages:
+                conversation_history = conversation_history[-max_messages:]
+
+        # Add conversation history
+        for msg in conversation_history:
+            if isinstance(msg, dict):
+                role = msg.get('role', 'user')
+                content = msg.get('content', '')
+                messages.append(provider_message.Message(role=role, content=content))
+            elif hasattr(msg, 'role') and hasattr(msg, 'content'):
+                messages.append(provider_message.Message(role=msg.role, content=msg.content))
+
+        # Add current user message
+        messages.append(provider_message.Message(role='user', content=user_message_text))
+
+        return messages
+
+    def _save_to_conversation_history(
+        self,
+        context: ExecutionContext,
+        user_message_text: str,
+        response_text: str,
+        max_round: int,
+    ) -> None:
+        """Save the exchange to conversation history."""
+        if max_round <= 0:
+            return
+
+        history = context.variables.get('_conversation_history', [])
+        history.append({'role': 'user', 'content': user_message_text})
+        history.append({'role': 'assistant', 'content': response_text})
+
+        # Enforce max_round limit
+        max_messages = max_round * 2
+        if len(history) > max_messages:
+            history = history[-max_messages:]
+
+        context.variables['_conversation_history'] = history
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        # Support both new model_config format and legacy model + fallback_models format
+        model_config = self.get_config('model_config', None)
+        if model_config and isinstance(model_config, dict):
+            # New format: {primary: uuid, fallbacks: [uuid1, uuid2, ...]}
+            model_uuid = model_config.get('primary', '')
+            fallback_models = model_config.get('fallbacks', [])
+        else:
+            # Legacy format: separate model and fallback_models
+            model_uuid = self.get_config('model', '')
+            fallback_models = self.get_config('fallback_models', [])
+        
+        if not model_uuid:
+            raise ValueError('No model configured for LLM call node')
+
+        if not self.ap:
+            raise RuntimeError('Application instance not available - cannot call LLM')
+
+        # Get error handling config
+        exception_handling = self.get_config('exception_handling', 'show-error')
+        failure_hint = self.get_config('failure_hint', 'Request failed.')
+        track_function_calls = self.get_config('track_function_calls', False)
+
+        # Get output format and json_schema config
+        output_format = self.get_config('output_format', 'text')
+        json_schema = self.get_config('json_schema', '')
+
+        # Agent config: knowledge bases, rerank, max_round
+        # (fallback_models already resolved above from model_config or fallback_models)
+        knowledge_bases = self.get_config('knowledge_bases', [])
+        rerank_model = self.get_config('rerank_model', '')
+        rerank_top_k = self.get_config('rerank_top_k', 5)
+        max_round = self.get_config('max_round', 10)
+
+        # Resolve prompts - support both new prompt array format and legacy format
+        prompt_array = self.get_config('prompt')
+        user_prompt = ''  # Initialize for later use in _save_to_conversation_history
+        
+        if prompt_array and isinstance(prompt_array, list):
+            # New format: prompt array like pipeline
+            messages = self._build_messages_from_prompt_array(
+                prompt_array, inputs, context, output_format, json_schema
+            )
+            
+            # Get user input text for knowledge retrieval
+            user_input = inputs.get('input', '')
+            
+            # Knowledge retrieval: enhance user input with RAG context
+            user_input = await self._retrieve_knowledge(
+                user_message_text=user_input,
+                knowledge_bases=knowledge_bases,
+                rerank_model_uuid=rerank_model,
+                rerank_top_k=rerank_top_k,
+            )
+            
+            # Track user_prompt for conversation history
+            user_prompt = user_input
+            
+            # Add user input as last message
+            if user_input:
+                messages.append(provider_message.Message(role='user', content=user_input))
+            
+            # Apply max_round to conversation history
+            conversation_history = context.variables.get('_conversation_history', [])
+            if max_round > 0 and conversation_history:
+                max_messages = max_round * 2
+                if len(conversation_history) > max_messages:
+                    conversation_history = conversation_history[-max_messages:]
+                # Insert conversation history before user input
+                history_messages = []
+                for msg in conversation_history:
+                    if isinstance(msg, dict):
+                        role = msg.get('role', 'user')
+                        content = msg.get('content', '')
+                        history_messages.append(provider_message.Message(role=role, content=content))
+                    elif hasattr(msg, 'role') and hasattr(msg, 'content'):
+                        history_messages.append(provider_message.Message(role=msg.role, content=msg.content))
+                # Insert history before user message
+                if history_messages and len(messages) > 0:
+                    messages = messages[:-1] + history_messages + [messages[-1]]
+        else:
+            # Legacy format: separate system_prompt and user_prompt_template
+            system_prompt = self._resolve_template(self.get_config('system_prompt') or '', inputs, context)
+            user_prompt_template = self.get_config('user_prompt_template')
+            if user_prompt_template is None:
+                user_prompt_template = '{{input}}'
+            user_prompt = self._resolve_template(user_prompt_template, inputs, context)
+
+            # Build system prompt with format instructions
+            system_prompt = self._build_system_prompt_with_format(system_prompt, output_format, json_schema)
+
+            # Knowledge retrieval: enhance user prompt with RAG context
+            user_prompt = await self._retrieve_knowledge(
+                user_message_text=user_prompt,
+                knowledge_bases=knowledge_bases,
+                rerank_model_uuid=rerank_model,
+                rerank_top_k=rerank_top_k,
+            )
+
+            # Build messages with conversation history
+            messages = self._build_messages_with_history(
+                system_prompt=system_prompt,
+                user_message_text=user_prompt,
+                context=context,
+                max_round=max_round,
+            )
+
+        # Get model candidates (primary + fallbacks)
+        candidates = await self._get_model_candidates(model_uuid, fallback_models)
+        if not candidates:
+            raise ValueError('No valid model candidates available')
+
+        # Build extra args from config
+        extra_args: dict[str, Any] = {}
+        temperature = self.get_config('temperature')
+        if temperature is not None:
+            extra_args['temperature'] = float(temperature)
+        max_tokens = self.get_config('max_tokens', 0)
+        if max_tokens and int(max_tokens) > 0:
+            extra_args['max_tokens'] = int(max_tokens)
+
+        # Track start time for duration calculation
+        self._llm_start_time = time.time()
+
+        # Invoke LLM with fallback
+        try:
+            result_message, used_model = await self._invoke_with_fallback(
+                candidates=candidates,
+                messages=messages,
+                funcs=None,
+                extra_args=extra_args,
+            )
+        except Exception as e:
+            logger.warning(f'[LLM:{self.node_id}] LLM call failed: {e}')
+
+            # Handle based on exception handling strategy
+            if exception_handling == 'show-error':
+                raise
+            elif exception_handling == 'show-hint':
+                return {
+                    'response': failure_hint,
+                    'usage': {
+                        'prompt_tokens': 0,
+                        'completion_tokens': 0,
+                        'total_tokens': 0,
+                    },
+                    'error': str(e),
+                    'error_hint_shown': True,
+                }
+            else:  # hide
+                return {
+                    'response': '',
+                    'usage': {
+                        'prompt_tokens': 0,
+                        'completion_tokens': 0,
+                        'total_tokens': 0,
+                    },
+                    'error': str(e),
+                }
+
+        # Extract response text
+        response_text = ''
+        if isinstance(result_message.content, str):
+            response_text = result_message.content
+        elif isinstance(result_message.content, list):
+            for elem in result_message.content:
+                if hasattr(elem, 'text') and elem.text:
+                    response_text += elem.text
+                elif isinstance(elem, str):
+                    response_text += elem
+
+        # Remove CoT content (always remove to avoid leaking internal reasoning)
+        response_text = self._remove_think_content(response_text)
+
+        # Initialize usage default
+        usage = {
+            'prompt_tokens': 0,
+            'completion_tokens': 0,
+            'total_tokens': 0,
+        }
+
+        # Apply content safety filter
+        response_text, is_blocked, filter_notice = self._apply_content_filter(response_text)
+        if is_blocked:
+            logger.warning(f'[LLM:{self.node_id}] Response blocked by content filter: {filter_notice}')
+            return {
+                'response': filter_notice,
+                'usage': usage,
+                'blocked_by_filter': True,
+            }
+
+        # Extract usage info
+        if hasattr(result_message, 'usage') and result_message.usage:
+            u = result_message.usage
+            # Handle both object and dict usage
+            if isinstance(u, dict):
+                usage = {
+                    'prompt_tokens': u.get('prompt_tokens', 0) or 0,
+                    'completion_tokens': u.get('completion_tokens', 0) or 0,
+                    'total_tokens': u.get('total_tokens', 0) or 0,
+                }
+            else:
+                usage = {
+                    'prompt_tokens': getattr(u, 'prompt_tokens', 0) or 0,
+                    'completion_tokens': getattr(u, 'completion_tokens', 0) or 0,
+                    'total_tokens': getattr(u, 'total_tokens', 0) or 0,
+                }
+        elif hasattr(result_message, 'token_usage') and result_message.token_usage:
+            u = result_message.token_usage
+            # Handle both object and dict token_usage
+            if isinstance(u, dict):
+                usage = {
+                    'prompt_tokens': u.get('prompt_tokens', 0) or 0,
+                    'completion_tokens': u.get('completion_tokens', 0) or 0,
+                    'total_tokens': u.get('total_tokens', 0) or 0,
+                }
+            else:
+                usage = {
+                    'prompt_tokens': getattr(u, 'prompt_tokens', 0) or 0,
+                    'completion_tokens': getattr(u, 'completion_tokens', 0) or 0,
+                    'total_tokens': getattr(u, 'total_tokens', 0) or 0,
+                }
+
+        # Log successful response (matching Pipeline's cut_str behavior)
+        def _cut_str(s: str) -> str:
+            s0 = s.split('\n')[0]
+            if len(s0) > 20 or '\n' in s:
+                s0 = s0[:20] + '...'
+            return s0
+        logger.info(f'[LLM:{self.node_id}] Response: {_cut_str(response_text)}')
+
+        # Record LLM call log only (response log is redundant)
+        try:
+            if self.ap and context.query:
+                workflow_id = context.workflow_id or ''
+                workflow_name = context.variables.get('_workflow_name', 'Workflow')
+                bot_name = context.variables.get('_bot_name', 'Workflow')
+                node_name = self.get_config('name', self.node_id)
+                model_name = used_model.model_entity.name if used_model else 'unknown'
+                
+                # Calculate duration
+                duration_ms = 0
+                if hasattr(self, '_llm_start_time'):
+                    duration_ms = int((time.time() - self._llm_start_time) * 1000)
+                
+                # Get message_id for LLM call association
+                message_id = context.variables.get('_monitoring_message_id')
+                
+                # Record LLM call log with message_id association
+                await monitoring_helper.WorkflowMonitoringHelper.record_llm_call_log(
+                    ap=self.ap,
+                    query=context.query,
+                    workflow_id=workflow_id,
+                    workflow_name=workflow_name,
+                    node_name=node_name,
+                    model_name=model_name,
+                    input_tokens=usage.get('prompt_tokens', 0),
+                    output_tokens=usage.get('completion_tokens', 0),
+                    duration_ms=duration_ms,
+                    status='success',
+                    bot_name=bot_name,
+                    context_vars=context.variables,
+                    message_id=message_id,
+                )
+        except Exception as e:
+            logger.warning(f'[LLM:{self.node_id}] Failed to record LLM logs: {e}')
+
+        # Save to conversation history
+        self._save_to_conversation_history(
+            context=context,
+            user_message_text=user_prompt,
+            response_text=response_text,
+            max_round=max_round,
+        )
+
+        # Build result
+        result: dict[str, Any] = {
+            'response': response_text,
+            'usage': usage,
+            'model_used': used_model.model_entity.name if used_model else None,
+            'model_uuid': used_model.model_entity.uuid if used_model else None,
+        }
+
+        # Parse JSON output if format is json
+        if output_format == 'json' and response_text:
+            try:
+                result['parsed'] = json.loads(response_text)
+            except json.JSONDecodeError as e:
+                logger.warning(f'[LLM:{self.node_id}] Failed to parse JSON: {e}')
+                result['parsed'] = None
+                result['parse_error'] = str(e)
+
+        # Add function call tracking info if configured
+        if track_function_calls:
+            result['function_calls'] = []
+
+        return result
+
+    async def execute_stream(
+        self, inputs: dict[str, Any], context: ExecutionContext
+    ) -> AsyncGenerator[str, None]:
+        """Execute the LLM call with streaming output.
+
+        Yields chunks of response text as they arrive.
+        Falls back to non-streaming if streaming is not available.
+        """
+        # Support both new model_config format and legacy model + fallback_models format
+        model_config = self.get_config('model_config', None)
+        if model_config and isinstance(model_config, dict):
+            model_uuid = model_config.get('primary', '')
+        else:
+            model_uuid = self.get_config('model', '')
+        
+        if not model_uuid:
+            raise ValueError('No model configured for LLM call node')
+
+        if not self.ap:
+            raise RuntimeError('Application instance not available - cannot call LLM')
+
+        exception_handling = self.get_config('exception_handling', 'show-error')
+        failure_hint = self.get_config('failure_hint', 'Request failed.')
+
+        # Resolve prompts - support both new prompt array format and legacy format
+        prompt_array = self.get_config('prompt')
+        if prompt_array and isinstance(prompt_array, list):
+            # New format: prompt array like pipeline
+            messages = self._build_messages_from_prompt_array(
+                prompt_array, inputs, context, 'text', ''  # No format instructions for streaming
+            )
+            
+            # Add user input
+            user_input = inputs.get('input', '')
+            if user_input:
+                messages.append(provider_message.Message(role='user', content=user_input))
+        else:
+            # Legacy format
+            system_prompt = self._resolve_template(self.get_config('system_prompt') or '', inputs, context)
+            user_prompt_template = self.get_config('user_prompt_template')
+            if user_prompt_template is None:
+                user_prompt_template = '{{input}}'
+            user_prompt = self._resolve_template(user_prompt_template, inputs, context)
+
+            # Build messages
+            messages = []
+            if system_prompt:
+                messages.append(provider_message.Message(role='system', content=system_prompt))
+            messages.append(provider_message.Message(role='user', content=user_prompt))
+
+        # Get model
+        runtime_model = await self.ap.model_mgr.get_model_by_uuid(model_uuid)
+
+        # Build extra args
+        extra_args: dict[str, Any] = {}
+        temperature = self.get_config('temperature')
+        if temperature is not None:
+            extra_args['temperature'] = float(temperature)
+        max_tokens = self.get_config('max_tokens', 0)
+        if max_tokens and int(max_tokens) > 0:
+            extra_args['max_tokens'] = int(max_tokens)
+
+        logger.info(f'[LLM:{self.node_id}] Streaming model {model_uuid}')
+
+        try:
+            # Try streaming first
+            stream = runtime_model.provider.invoke_llm_stream(
+                query=None,
+                model=runtime_model,
+                messages=messages,
+                funcs=None,
+                extra_args=extra_args,
+            )
+
+            full_response = ''
+            in_think_block = False
+            async for chunk in stream:
+                chunk_text = ''
+                if hasattr(chunk, 'content'):
+                    if isinstance(chunk.content, str):
+                        chunk_text = chunk.content
+                    elif isinstance(chunk.content, list):
+                        for elem in chunk.content:
+                            if hasattr(elem, 'text') and elem.text:
+                                chunk_text += elem.text
+                            elif isinstance(elem, str):
+                                chunk_text += elem
+
+                if chunk_text:
+                    # Filter <think> blocks in streaming mode
+                    if '<think>' in chunk_text or '<thought>' in chunk_text:
+                        in_think_block = True
+                    if in_think_block:
+                        if '</think>' in chunk_text or '</thought>' in chunk_text:
+                            in_think_block = False
+                            chunk_text = chunk_text.split('</think>')[-1].split('</thought>')[-1]
+                        else:
+                            chunk_text = ''
+                    
+                    if chunk_text:
+                        full_response += chunk_text
+                        yield chunk_text
+
+            # Store in context for downstream nodes
+            context.variables['_last_llm_response'] = full_response
+
+        except Exception as e:
+            logger.warning(f'[LLM:{self.node_id}] Streaming failed, falling back - {e}')
+            # Fallback to non-streaming
+            try:
+                result_message = await runtime_model.provider.invoke_llm(
+                    query=None,
+                    model=runtime_model,
+                    messages=messages,
+                    funcs=None,
+                    extra_args=extra_args,
+                )
+                response_text = self._extract_response_text(result_message)
+                # Always remove <think> content in fallback
+                response_text = self._remove_think_content(response_text)
+                yield response_text
+                context.variables['_last_llm_response'] = response_text
+            except Exception as e2:
+                logger.error(f'[LLM:{self.node_id}] Fallback also failed - {e2}')
+                if exception_handling == 'show-hint':
+                    yield failure_hint
+                elif exception_handling != 'hide':
+                    raise
+
+    def _extract_response_text(self, result_message: provider_message.Message) -> str:
+        """Extract response text from LLM result message."""
+        response_text = ''
+        if isinstance(result_message.content, str):
+            response_text = result_message.content
+        elif isinstance(result_message.content, list):
+            for elem in result_message.content:
+                if hasattr(elem, 'text') and elem.text:
+                    response_text += elem.text
+                elif isinstance(elem, str):
+                    response_text += elem
+        return response_text

src/langbot/pkg/workflow/nodes/loop.py

@@ -0,0 +1,30 @@
+"""Loop Node - iterate over items"""
+
+from __future__ import annotations
+
+from typing import Any
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+
+@workflow_node('loop')
+class LoopNode(WorkflowNode):
+    """Loop node - iterate over items"""
+
+    category = 'control'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        items = inputs.get('items', [])
+        if not isinstance(items, list):
+            items = [items] if items else []
+
+        max_iterations = self.get_config('max_iterations', 100)
+        items = items[:max_iterations]
+
+        return {
+            'item': items[0] if items else None,
+            'index': 0,
+            'results': [],
+            'completed': len(items) == 0,
+            '_items': items,
+        }

src/langbot/pkg/workflow/nodes/mcp_tool.py

@@ -0,0 +1,58 @@
+"""MCP Tool Node - Invoke MCP (Model Context Protocol) tools
+
+This module contains the implementation for the MCP Tool workflow node.
+Node metadata (label, description, inputs, outputs, config) is loaded from:
+../../templates/metadata/nodes/mcp_tool.yaml
+
+The i18n for label and description is handled on the frontend side.
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+
+@workflow_node('mcp_tool')
+class MCPToolNode(WorkflowNode):
+    """MCP tool node - invoke MCP (Model Context Protocol) tools"""
+
+    # Node type for registration
+
+    # Category and icon - these are not i18n
+    category = 'integration'
+
+    # Name and description - i18n handled on frontend side
+    # Frontend will use node type key to look up translation
+
+    # Inputs/outputs/config - loaded from YAML at runtime
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        """Execute the MCP tool node
+
+        Args:
+            inputs: Input data from connected nodes
+            context: Execution context with workflow state
+
+        Returns:
+            Dictionary of output values
+        """
+        server_name = self.get_config('server_name', '')
+        tool_name = self.get_config('tool_name', '')
+        arguments_template = self.get_config('arguments_template', '')
+        timeout = self.get_config('timeout', 30)
+
+        arguments = inputs.get('arguments', arguments_template)
+
+        return {
+            'result': None,
+            'success': False,
+            'error': f"MCP tool '{server_name}/{tool_name}' not implemented yet",
+            '_debug': {
+                'server_name': server_name,
+                'tool_name': tool_name,
+                'arguments': arguments,
+                'timeout': timeout,
+            },
+        }

src/langbot/pkg/workflow/nodes/memory_store.py

@@ -0,0 +1,85 @@
+"""Memory Store Node - store and retrieve from workflow memory
+
+Node metadata is loaded from: ../../templates/metadata/nodes/memory_store.yaml
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+
+class MemoryHelper:
+    """Helper class wrapping context.memory dict with get/set/delete/list_all/append operations"""
+
+    def __init__(self, memory_dict: dict[str, Any]):
+        self._data = memory_dict
+
+    def get(self, key: str, scope: str = 'execution', default: Any = None) -> Any:
+        """Get a value from memory by key"""
+        scoped_key = f'{scope}:{key}' if scope else key
+        return self._data.get(scoped_key, default)
+
+    def set(self, key: str, value: Any, scope: str = 'execution', ttl: int = 0) -> None:
+        """Set a value in memory"""
+        scoped_key = f'{scope}:{key}' if scope else key
+        self._data[scoped_key] = value
+
+    def delete(self, key: str, scope: str = 'execution') -> None:
+        """Delete a value from memory"""
+        scoped_key = f'{scope}:{key}' if scope else key
+        self._data.pop(scoped_key, None)
+
+    def list_all(self, scope: str = 'execution') -> dict[str, Any]:
+        """List all values in the given scope"""
+        prefix = f'{scope}:'
+        return {k[len(prefix) :]: v for k, v in self._data.items() if k.startswith(prefix)}
+
+    def append(self, key: str, value: Any, scope: str = 'execution', ttl: int = 0) -> list:
+        """Append a value to a list in memory"""
+        current = self.get(key, scope=scope, default=[])
+        if isinstance(current, list):
+            current.append(value)
+        else:
+            current = [current, value]
+        self.set(key, current, scope=scope, ttl=ttl)
+        return current
+
+@workflow_node('memory_store')
+class MemoryStoreNode(WorkflowNode):
+    """Memory store node - store and retrieve from workflow memory"""
+
+    category = 'integration'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        operation = self.get_config('operation', 'get')
+        key = self.get_config('key', '')
+        scope = self.get_config('scope', 'execution')
+        ttl = self.get_config('ttl', 0)
+
+        value = inputs.get('value')
+
+        # Wrap context.memory dict with MemoryHelper for structured operations
+        memory = MemoryHelper(context.memory)
+
+        try:
+            if operation == 'get':
+                result = memory.get(key, scope=scope)
+                return {'result': result, 'success': True}
+            elif operation == 'set':
+                memory.set(key, value, scope=scope, ttl=ttl)
+                return {'result': value, 'success': True}
+            elif operation == 'delete':
+                memory.delete(key, scope=scope)
+                return {'result': None, 'success': True}
+            elif operation == 'append':
+                result = memory.append(key, value, scope=scope, ttl=ttl)
+                return {'result': result, 'success': True}
+            elif operation == 'list':
+                result = memory.list_all(scope=scope)
+                return {'result': result, 'success': True}
+            else:
+                return {'result': None, 'success': False, 'error': f'Unknown operation: {operation}'}
+        except Exception as e:
+            return {'result': None, 'success': False, 'error': str(e)}

src/langbot/pkg/workflow/nodes/merge.py

@@ -0,0 +1,52 @@
+"""Merge Node - combine multiple inputs
+
+Node metadata is loaded from: ../../templates/metadata/nodes/merge.yaml
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+
+@workflow_node('merge')
+class MergeNode(WorkflowNode):
+    """Merge node - combine multiple inputs"""
+
+    category = 'control'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        strategy = self.get_config('merge_strategy', 'object')
+
+        values = [inputs.get('input_1'), inputs.get('input_2'), inputs.get('input_3'), inputs.get('input_4')]
+        non_null_values = [v for v in values if v is not None]
+
+        if strategy == 'object':
+            merged = {}
+            for i, v in enumerate(non_null_values):
+                if isinstance(v, dict):
+                    merged.update(v)
+                else:
+                    merged[f'value_{i}'] = v
+            return {'merged': merged, 'array': non_null_values}
+
+        elif strategy == 'array':
+            return {'merged': non_null_values, 'array': non_null_values}
+
+        elif strategy == 'first_non_null':
+            first = non_null_values[0] if non_null_values else None
+            return {'merged': first, 'array': non_null_values}
+
+        elif strategy == 'concat':
+            if all(isinstance(v, str) for v in non_null_values):
+                return {'merged': ''.join(non_null_values), 'array': non_null_values}
+            elif all(isinstance(v, list) for v in non_null_values):
+                merged_list = []
+                for v in non_null_values:
+                    merged_list.extend(v)
+                return {'merged': merged_list, 'array': merged_list}
+            else:
+                return {'merged': non_null_values, 'array': non_null_values}
+
+        return {'merged': non_null_values, 'array': non_null_values}

src/langbot/pkg/workflow/nodes/message_trigger.py

@@ -0,0 +1,69 @@
+"""Message Trigger Node - triggers workflow on message arrival
+
+This module contains the implementation for the Message Trigger workflow node.
+Node metadata (label, description, inputs, outputs, config) is loaded from:
+../../templates/metadata/nodes/message_trigger.yaml
+"""
+
+from __future__ import annotations
+
+import logging
+from typing import Any
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+from .. import monitoring_helper
+
+logger = logging.getLogger(__name__)
+
+
+@workflow_node('message_trigger')
+class MessageTriggerNode(WorkflowNode):
+    """Message trigger node - triggers workflow on message arrival"""
+
+    category = 'trigger'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        msg_ctx = context.message_context
+
+        # Record trigger log and store message_id for LLM call association
+        try:
+            if self.ap and context.query:
+                workflow_id = context.workflow_id or ''
+                workflow_name = context.variables.get('_workflow_name', 'Workflow')
+                bot_name = context.variables.get('_bot_name', 'Workflow')
+                message_id = await monitoring_helper.WorkflowMonitoringHelper.record_trigger_log(
+                    ap=self.ap,
+                    query=context.query,
+                    workflow_id=workflow_id,
+                    workflow_name=workflow_name,
+                    bot_name=bot_name,
+                    context_vars=context.variables,
+                )
+                # Store message_id for LLM call monitoring association
+                if message_id:
+                    context.variables['_monitoring_message_id'] = message_id
+        except Exception as e:
+            logger.warning(f'[MessageTrigger:{self.node_id}] Failed to record trigger log: {e}')
+
+        if msg_ctx:
+            return {
+                'message': msg_ctx.message_content,
+                'sender_id': msg_ctx.sender_id,
+                'sender_name': msg_ctx.sender_name,
+                'platform': msg_ctx.platform,
+                'conversation_id': msg_ctx.conversation_id,
+                'is_group': msg_ctx.is_group,
+                'context': msg_ctx.model_dump(),
+            }
+
+        # Use safe variable access with fallback
+        return {
+            'message': context.get_variable('message') or '',
+            'sender_id': context.get_variable('sender_id') or '',
+            'sender_name': context.get_variable('sender_name') or '',
+            'platform': context.get_variable('platform') or '',
+            'conversation_id': context.get_variable('conversation_id') or '',
+            'is_group': context.get_variable('is_group') or False,
+            'context': context.trigger_data or {},
+        }

src/langbot/pkg/workflow/nodes/n8n_workflow.py

@@ -0,0 +1,34 @@
+"""N8n Workflow Node - call n8n workflow API
+
+Node metadata is loaded from: ../../templates/metadata/nodes/n8n_workflow.yaml
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+
+@workflow_node('n8n_workflow')
+class N8nWorkflowNode(WorkflowNode):
+    """n8n workflow node - call n8n workflow API"""
+
+    category = 'integration'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        webhook_url = self.get_config('webhook_url', '')
+        auth_type = self.get_config('auth_type', 'none')
+        timeout = self.get_config('timeout', 120)
+        payload = inputs.get('payload', {})
+
+        return {
+            'result': None,
+            'success': False,
+            '_debug': {
+                'webhook_url': webhook_url,
+                'auth_type': auth_type,
+                'timeout': timeout,
+                'payload': payload,
+            },
+        }

src/langbot/pkg/workflow/nodes/opening_statement.py

@@ -0,0 +1,24 @@
+"""Opening Statement Node - provide conversation opener and suggested questions
+
+Node metadata is loaded from: ../../templates/metadata/nodes/opening_statement.yaml
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+
+@workflow_node('opening_statement')
+class OpeningStatementNode(WorkflowNode):
+    """Opening statement node - provide conversation opener and suggested questions"""
+
+    category = 'action'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        statement = self.get_config('statement', '')
+        suggestions = self.get_config('suggested_questions', [])
+        show = self.get_config('show_suggestions', True)
+
+        return {'statement': statement, 'suggested_questions': suggestions if show else []}

src/langbot/pkg/workflow/nodes/parallel.py

@@ -0,0 +1,20 @@
+"""Parallel Node - execute multiple branches simultaneously"""
+
+from __future__ import annotations
+
+from typing import Any
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+
+@workflow_node('parallel')
+class ParallelNode(WorkflowNode):
+    """Parallel node - execute multiple branches simultaneously"""
+
+    category = 'control'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        return {
+            'results': {},
+            'errors': [],
+        }

src/langbot/pkg/workflow/nodes/parameter_extractor.py

@@ -0,0 +1,149 @@
+"""Parameter Extractor Node - extract structured parameters from text
+
+Node metadata is loaded from: ../../templates/metadata/nodes/parameter_extractor.yaml
+"""
+
+from __future__ import annotations
+
+import json
+import logging
+from typing import Any
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+
+logger = logging.getLogger(__name__)
+
+@workflow_node('parameter_extractor')
+class ParameterExtractorNode(WorkflowNode):
+    """Parameter extractor node - extract structured parameters from text"""
+
+    category = 'process'
+    icon: str = 'Variable'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        # Get input text
+        input_text = inputs.get('input') or inputs.get('message') or inputs.get('content') or ''
+        input_text = str(input_text) if input_text is not None else ''
+
+        # Get configuration
+        param_defs = self.get_config('parameters', [])
+        model_id = self.get_config('model', '')
+        system_prompt = self.get_config('system_prompt', '')
+
+        if not input_text.strip():
+            return {
+                'parameters': {},
+                'extraction_success': False,
+                'error': 'Empty input',
+            }
+
+        if not param_defs:
+            return {
+                'parameters': {},
+                'extraction_success': False,
+                'error': 'No parameters configured',
+            }
+
+        # Build parameter schema for LLM prompt
+        param_schema = []
+        for param in param_defs:
+            schema_item = {
+                'name': param.get('name', ''),
+                'type': param.get('type', 'string'),
+                'description': param.get('description', ''),
+                'required': param.get('required', False),
+            }
+            param_schema.append(schema_item)
+
+        # Build extraction prompt
+        if not system_prompt:
+            system_prompt = (
+                f'Extract the following parameters from the user\'s text as JSON. '
+                f'Respond with ONLY a valid JSON object containing the extracted parameters.\n\n'
+                f'Parameters to extract:\n'
+                f'{json.dumps(param_schema, indent=2, ensure_ascii=False)}\n\n'
+                f'Respond with a JSON object like: {{"param_name": "value", ...}}'
+            )
+
+        # Call LLM for extraction
+        if self.ap and model_id:
+            try:
+                # Get model (same as llm_call.py)
+                runtime_model = await self.ap.model_mgr.get_model_by_uuid(model_id)
+
+                # Build messages
+                from langbot_plugin.api.entities.builtin.provider.message import Message
+                messages = []
+                if system_prompt:
+                    messages.append(Message(role='system', content=system_prompt))
+                messages.append(Message(role='user', content=input_text))
+
+                # Invoke LLM (same as llm_call.py)
+                result_message = await runtime_model.provider.invoke_llm(
+                    query=None,
+                    model=runtime_model,
+                    messages=messages,
+                    funcs=None,
+                    extra_args={},
+                )
+
+                # Log successful response (matching Pipeline's cut_str behavior)
+                response_preview = ''
+                if isinstance(result_message.content, str):
+                    response_preview = result_message.content
+                elif isinstance(result_message.content, list):
+                    for elem in result_message.content:
+                        if hasattr(elem, 'text') and elem.text:
+                            response_preview += elem.text
+                response_preview = response_preview.strip()
+                def _cut_str(s: str) -> str:
+                    s0 = s.split('\n')[0]
+                    if len(s0) > 20 or '\n' in s:
+                        s0 = s0[:20] + '...'
+                    return s0
+                logger.info(f'[ParameterExtractor:{self.node_id}] Response: {_cut_str(response_preview)}')
+
+                # Extract response text
+                response_text = ''
+                if isinstance(result_message.content, str):
+                    response_text = result_message.content
+                elif isinstance(result_message.content, list):
+                    for elem in result_message.content:
+                        if hasattr(elem, 'text') and elem.text:
+                            response_text += elem.text
+                        elif isinstance(elem, str):
+                            response_text += elem
+
+                response_text = response_text.strip()
+
+                # Parse JSON response
+                try:
+                    extracted = json.loads(response_text)
+                    return {
+                        'parameters': extracted,
+                        'extraction_success': True,
+                        'raw_response': response_text[:500],
+                    }
+                except json.JSONDecodeError as e:
+                    logger.error('ParameterExtractorNode JSON parse error: %s', e)
+                    return {
+                        'parameters': {},
+                        'extraction_success': False,
+                        'error': f'Failed to parse JSON: {e}',
+                        'raw_response': response_text[:500],
+                    }
+
+            except Exception as e:
+                logger.error('ParameterExtractorNode LLM error: %s', e, exc_info=True)
+                return {
+                    'parameters': {},
+                    'extraction_success': False,
+                    'error': f'LLM error: {e}',
+                }
+        else:
+            return {
+                'parameters': {},
+                'extraction_success': False,
+                'error': 'Missing model configuration',
+            }

src/langbot/pkg/workflow/nodes/plugin_call.py

@@ -0,0 +1,41 @@
+# """Plugin Call Node - invoke a plugin
+
+# Node metadata is loaded from: ../../templates/metadata/nodes/plugin_call.yaml
+# """
+
+# from __future__ import annotations
+
+# from typing import Any
+
+# from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+# from ..node import WorkflowNode, workflow_node
+
+# @workflow_node('plugin_call')
+# class PluginCallNode(WorkflowNode):
+#     """Plugin call node - invoke a plugin"""
+
+#     type_name = "plugin_call"
+#     category = "action"
+#     icon = "🔌"
+#     name = "plugin_call"
+#     description = "plugin_call"
+
+#     inputs: ClassVar[list[NodePort]] = []
+#     outputs: ClassVar[list[NodePort]] = []
+#     config_schema: ClassVar[list[NodeConfig]] = []
+
+#     async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+#         plugin_name = self.get_config("plugin_name", "")
+#         method_name = self.get_config("method_name", "")
+#         arguments = inputs.get("arguments", {})
+
+#         return {
+#             "result": None,
+#             "success": False,
+#             "error": f"Plugin call '{plugin_name}/{method_name}' not implemented yet",
+#             "_debug": {
+#                 "plugin_name": plugin_name,
+#                 "method_name": method_name,
+#                 "arguments": arguments,
+#             },
+#         }

src/langbot/pkg/workflow/nodes/question_classifier.py

@@ -0,0 +1,145 @@
+"""Question Classifier Node - classify user questions into categories
+
+Node metadata is loaded from: ../../templates/metadata/nodes/question_classifier.yaml
+"""
+
+from __future__ import annotations
+
+import logging
+from typing import Any
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+
+logger = logging.getLogger(__name__)
+
+@workflow_node('question_classifier')
+class QuestionClassifierNode(WorkflowNode):
+    """Question classifier node - classify user questions into categories"""
+
+    category = 'process'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        # Get input text
+        input_text = inputs.get('input') or inputs.get('message') or inputs.get('content') or ''
+        input_text = str(input_text) if input_text is not None else ''
+
+        # Get configuration
+        categories = self.get_config('categories', [])
+        model_id = self.get_config('model', '')
+        system_prompt = self.get_config('system_prompt', '')
+
+        if not input_text.strip():
+            return {
+                'category': 'unknown',
+                'confidence': 0.0,
+                'all_scores': {},
+                'error': 'Empty input',
+            }
+
+        if not categories:
+            return {
+                'category': 'unknown',
+                'confidence': 0.0,
+                'all_scores': {},
+                'error': 'No categories configured',
+            }
+
+        # Build category list for LLM prompt
+        category_names = [cat.get('name', '') for cat in categories if cat.get('name')]
+
+        # Build classification prompt
+        if not system_prompt:
+            system_prompt = (
+                f'You are a question classifier. Classify the user\'s question into one of these categories: '
+                f'{", ".join(category_names)}. '
+                f'Respond with ONLY the category name, nothing else.'
+            )
+
+        # Call LLM for classification
+        if self.ap and model_id:
+            try:
+                # Get model (same as llm_call.py)
+                runtime_model = await self.ap.model_mgr.get_model_by_uuid(model_id)
+
+                # Build messages
+                from langbot_plugin.api.entities.builtin.provider.message import Message
+                messages = []
+                if system_prompt:
+                    messages.append(Message(role='system', content=system_prompt))
+                messages.append(Message(role='user', content=input_text))
+
+                # Invoke LLM (same as llm_call.py)
+                result_message = await runtime_model.provider.invoke_llm(
+                    query=None,
+                    model=runtime_model,
+                    messages=messages,
+                    funcs=None,
+                    extra_args={},
+                )
+
+                # Log successful response (matching Pipeline's cut_str behavior)
+                response_preview = ''
+                if isinstance(result_message.content, str):
+                    response_preview = result_message.content
+                elif isinstance(result_message.content, list):
+                    for elem in result_message.content:
+                        if hasattr(elem, 'text') and elem.text:
+                            response_preview += elem.text
+                response_preview = response_preview.strip()
+                def _cut_str(s: str) -> str:
+                    s0 = s.split('\n')[0]
+                    if len(s0) > 20 or '\n' in s:
+                        s0 = s0[:20] + '...'
+                    return s0
+                logger.info(f'[QuestionClassifier:{self.node_id}] Response: {_cut_str(response_preview)}')
+
+                # Extract response text
+                response_text = ''
+                if isinstance(result_message.content, str):
+                    response_text = result_message.content
+                elif isinstance(result_message.content, list):
+                    for elem in result_message.content:
+                        if hasattr(elem, 'text') and elem.text:
+                            response_text += elem.text
+                        elif isinstance(elem, str):
+                            response_text += elem
+
+                response_text = response_text.strip()
+
+                # Find matching category
+                matched_category = None
+                for cat in categories:
+                    if cat.get('name', '').lower() == response_text.lower():
+                        matched_category = cat
+                        break
+
+                if matched_category:
+                    return {
+                        'category': matched_category['name'],
+                        'confidence': 0.9,
+                        'all_scores': {cat.get('name', ''): 0.1 for cat in categories},
+                    }
+                else:
+                    # Default to first category if no match
+                    return {
+                        'category': category_names[0] if category_names else 'unknown',
+                        'confidence': 0.5,
+                        'all_scores': {cat.get('name', ''): 0.1 for cat in categories},
+                    }
+
+            except Exception as e:
+                logger.error('QuestionClassifierNode LLM error: %s', e, exc_info=True)
+                return {
+                    'category': category_names[0] if category_names else 'unknown',
+                    'confidence': 0.0,
+                    'all_scores': {},
+                    'error': f'LLM error: {e}',
+                }
+        else:
+            return {
+                'category': category_names[0] if category_names else 'unknown',
+                'confidence': 0.0,
+                'all_scores': {},
+                'error': 'Missing model configuration',
+            }

src/langbot/pkg/workflow/nodes/redis_operation.py

@@ -0,0 +1,40 @@
+"""Redis Operation Node - perform Redis cache operations
+
+Node metadata is loaded from: ../../templates/metadata/nodes/redis_operation.yaml
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+
+@workflow_node('redis_operation')
+class RedisOperationNode(WorkflowNode):
+    """Redis operation node - perform Redis cache operations"""
+
+    category = 'integration'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        connection_url = self.get_config('connection_url', 'redis://localhost:6379')
+        operation = self.get_config('operation', 'get')
+        key_template = self.get_config('key_template', '')
+        hash_field = self.get_config('hash_field', '')
+        ttl = self.get_config('ttl', 0)
+
+        key = inputs.get('key', key_template)
+        value = inputs.get('value')
+
+        return {
+            'result': None,
+            'success': False,
+            '_debug': {
+                'connection_url': connection_url,
+                'operation': operation,
+                'key': key,
+                'hash_field': hash_field,
+                'ttl': ttl,
+                'value': value,
+            },
+        }

src/langbot/pkg/workflow/nodes/reply_message.py

@@ -0,0 +1,141 @@
+"""Reply Message Node - reply to the triggering message
+
+Node metadata is loaded from: ../../templates/metadata/nodes/reply_message.yaml
+"""
+
+from __future__ import annotations
+
+import logging
+from typing import Any
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+from .. import monitoring_helper
+
+logger = logging.getLogger(__name__)
+
+@workflow_node('reply_message')
+class ReplyMessageNode(WorkflowNode):
+    """Reply message node - reply to the triggering message"""
+
+    category = 'action'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        # Priority: content/response (from upstream nodes) > message (original input) > context
+        message = inputs.get('content')
+        if message in (None, ''):
+            message = inputs.get('response')
+        if message in (None, ''):
+            message = inputs.get('input')
+        if message in (None, ''):
+            message = inputs.get('message')
+        if message in (None, '') and context.message_context:
+            message = context.message_context.message_content
+        if message is None:
+            message = ''
+
+        template = self.get_config('message_template')
+
+        if template:
+            message = template
+            for key, value in inputs.items():
+                try:
+                    message = message.replace(f'{{{{{key}}}}}', str(value) if value is not None else '')
+                except Exception as e:
+                    logger.debug(
+                        'ReplyMessageNode failed to replace input template variable',
+                        extra={'node_id': self.node_id, 'key': str(key), 'error': str(e)},
+                    )
+            for key, value in context.variables.items():
+                try:
+                    message = message.replace(f'{{{{variables.{key}}}}}', str(value) if value is not None else '')
+                except Exception as e:
+                    logger.debug(
+                        'ReplyMessageNode failed to replace context template variable',
+                        extra={'node_id': self.node_id, 'key': str(key), 'error': str(e)},
+                    )
+
+        message_str = str(message) if message is not None else ''
+
+        logger.info(
+            'ReplyMessageNode resolved message',
+            extra={
+                'node_id': self.node_id,
+                'execution_id': context.execution_id,
+                'input_keys': list(inputs.keys()),
+                'message_preview': message_str[:200],
+                'has_template': bool(template),
+                'session_id': context.session_id,
+            },
+        )
+
+        if not message_str.strip():
+            logger.warning(
+                'ReplyMessageNode has empty message after resolution',
+                extra={
+                    'node_id': self.node_id,
+                    'execution_id': context.execution_id,
+                    'input_keys': list(inputs.keys()),
+                },
+            )
+
+        # 实际发送消息
+        send_success = False
+        send_error = None
+        if self.ap:
+            try:
+                from langbot_plugin.api.entities.builtin.platform.message import MessageChain, Plain
+
+                message_chain = MessageChain([Plain(text=message_str)])
+                # 从 trigger_data 中获取 session_type，而不是从未设置的 context.target_type
+                target_type = 'person'
+                if context.trigger_data:
+                    target_type = context.trigger_data.get('session_type', 'person') or 'person'
+                session_id = context.session_id or 'unknown'
+                target_id = f'websocket_{session_id}'
+
+                await self.ap.platform_mgr.websocket_proxy_bot.adapter.send_message(
+                    target_type=target_type,
+                    target_id=target_id,
+                    message=message_chain,
+                )
+                send_success = True
+            except Exception as e:
+                send_error = str(e)
+                logger.error('ReplyMessageNode send message failed: %s', e, exc_info=True)
+        else:
+            send_error = 'Missing application instance'
+            logger.warning(
+                'ReplyMessageNode missing application instance',
+                extra={
+                    'node_id': self.node_id,
+                    'execution_id': context.execution_id,
+                },
+            )
+
+        # Record reply log
+        try:
+            if self.ap and context.query and send_success:
+                workflow_id = context.workflow_id or ''
+                workflow_name = context.variables.get('_workflow_name', 'Workflow')
+                bot_name = context.variables.get('_bot_name', 'Workflow')
+                node_name = self.get_config('name', self.node_id)
+                await monitoring_helper.WorkflowMonitoringHelper.record_reply_log(
+                    ap=self.ap,
+                    query=context.query,
+                    workflow_id=workflow_id,
+                    workflow_name=workflow_name,
+                    node_name=node_name,
+                    reply_content=message_str,
+                    bot_name=bot_name,
+                    context_vars=context.variables,
+                )
+        except Exception as e:
+            logger.warning(f'[ReplyMessage:{self.node_id}] Failed to record reply log: {e}')
+
+        return {
+            'status': 'sent' if send_success else 'failed',
+            'message_content': message_str,
+            'message_preview': message_str[:200],
+            'error': send_error,
+        }

src/langbot/pkg/workflow/nodes/send_message.py

@@ -0,0 +1,79 @@
+"""Send Message Node - send message to a target
+
+Node metadata is loaded from: ../../templates/metadata/nodes/send_message.yaml
+"""
+
+from __future__ import annotations
+
+import logging
+from typing import Any
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+
+logger = logging.getLogger(__name__)
+
+@workflow_node('send_message')
+class SendMessageNode(WorkflowNode):
+    """Send message node - send message to a target"""
+
+    category = 'action'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        # Get message content from inputs
+        message = inputs.get('message') or inputs.get('content') or inputs.get('input') or ''
+        message = str(message) if message is not None else ''
+
+        # Get target configuration - fallback to session_type from context if not configured
+        target_type = self.get_config('target_type', '')
+        if not target_type:
+            # Inherit from current session context
+            if context.trigger_data:
+                target_type = context.trigger_data.get('session_type', 'person') or 'person'
+            else:
+                target_type = 'person'
+        
+        target_id = self.get_config('target_id', '')
+        
+        # If no target_id configured, use session_id from context
+        if not target_id:
+            target_id = f'{context.session_id or "unknown"}'
+
+        if not message.strip():
+            logger.warning('SendMessageNode has empty message')
+            return {
+                'status': 'failed',
+                'error': 'Empty message',
+                'message_preview': '',
+            }
+
+        # Send message if application instance is available
+        send_success = False
+        send_error = None
+        if self.ap:
+            try:
+                from langbot_plugin.api.entities.builtin.platform.message import MessageChain, Plain
+
+                message_chain = MessageChain([Plain(text=message)])
+                await self.ap.platform_mgr.websocket_proxy_bot.adapter.send_message(
+                    target_type=target_type,
+                    target_id=target_id,
+                    message=message_chain,
+                )
+                send_success = True
+                logger.info('SendMessageNode sent message to %s:%s', target_type, target_id)
+            except Exception as e:
+                send_error = str(e)
+                logger.error('SendMessageNode send failed: %s', e, exc_info=True)
+        else:
+            send_error = 'Missing application instance'
+            logger.warning('SendMessageNode missing application instance')
+
+        return {
+            'status': 'sent' if send_success else 'failed',
+            'message_content': message,
+            'message_preview': message[:200],
+            'target_type': target_type,
+            'target_id': target_id,
+            'error': send_error,
+        }

src/langbot/pkg/workflow/nodes/set_variable.py

@@ -0,0 +1,51 @@
+"""Set Variable Node - set workflow or conversation variable
+
+Node metadata is loaded from: ../../templates/metadata/nodes/set_variable.yaml
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+
+@workflow_node('set_variable')
+class SetVariableNode(WorkflowNode):
+    """Set variable node - set workflow or conversation variable"""
+
+    category = 'action'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        value = inputs.get('value')
+        name = self.get_config('variable_name', '')
+        scope = self.get_config('variable_scope', 'workflow')
+        operation = self.get_config('operation', 'set')
+
+        if scope == 'conversation':
+            current = context.get_conversation_variable(name)
+        else:
+            current = context.get_variable(name)
+
+        if operation == 'set':
+            final_value = value
+        elif operation == 'append':
+            if isinstance(current, list):
+                final_value = current + [value]
+            elif isinstance(current, str):
+                final_value = current + str(value)
+            else:
+                final_value = [current, value] if current else [value]
+        elif operation == 'increment':
+            final_value = (current or 0) + (value if isinstance(value, (int, float)) else 1)
+        elif operation == 'decrement':
+            final_value = (current or 0) - (value if isinstance(value, (int, float)) else 1)
+        else:
+            final_value = value
+
+        if scope == 'conversation':
+            context.set_conversation_variable(name, final_value)
+        else:
+            context.set_variable(name, final_value)
+
+        return {'value': final_value}

src/langbot/pkg/workflow/nodes/store_data.py

@@ -0,0 +1,32 @@
+"""Store Data Node - save data to storage
+
+Node metadata is loaded from: ../../templates/metadata/nodes/store_data.yaml
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+
+@workflow_node('store_data')
+class StoreDataNode(WorkflowNode):
+    """Store data node - save data to storage"""
+
+    category = 'action'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        key = inputs.get('key', '')
+        value = inputs.get('value')
+        storage_type = self.get_config('storage_type', 'session')
+        prefix = self.get_config('key_prefix', '')
+
+        full_key = f'{prefix}{key}' if prefix else key
+
+        if storage_type == 'session':
+            context.set_conversation_variable(full_key, value)
+        else:
+            context.set_variable(full_key, value)
+
+        return {'status': 'stored'}

src/langbot/pkg/workflow/nodes/switch.py

@@ -0,0 +1,51 @@
+"""Switch Node - multi-way branch based on value
+
+Node metadata is loaded from: ../../templates/metadata/nodes/switch.yaml
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+
+@workflow_node('switch')
+class SwitchNode(WorkflowNode):
+    """Switch node - multi-way branch based on value"""
+
+    category = 'control'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        expression = self.get_config('expression', '')
+        cases = self.get_config('cases', [])
+        input_data = inputs.get('input')
+
+        value = await self._evaluate_expression(expression, input_data, context)
+
+        for case in cases:
+            if str(case.get('value')) == str(value):
+                return {'matched_case': input_data, 'default': None, '_matched_output': case.get('output')}
+
+        return {'matched_case': None, 'default': input_data}
+
+    async def _evaluate_expression(self, expression: str, data: Any, context: ExecutionContext) -> Any:
+        if not expression:
+            return data
+
+        if expression.startswith('{{') and expression.endswith('}}'):
+            var_path = expression[2:-2].strip()
+            parts = var_path.split('.')
+
+            if parts[0] == 'input':
+                result = data
+                for part in parts[1:]:
+                    if isinstance(result, dict):
+                        result = result.get(part)
+                    else:
+                        return None
+                return result
+            elif parts[0] == 'variables':
+                return context.variables.get('.'.join(parts[1:]))
+
+        return expression

src/langbot/pkg/workflow/nodes/variable_aggregator.py

@@ -0,0 +1,38 @@
+"""Variable Aggregator Node - aggregate variables from multiple branches
+
+Node metadata is loaded from: ../../templates/metadata/nodes/variable_aggregator.yaml
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+
+@workflow_node('variable_aggregator')
+class VariableAggregatorNode(WorkflowNode):
+    """Variable aggregator node - aggregate variables from multiple branches"""
+
+    category = 'control'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        variables = inputs.get('variables', {})
+        mode = self.get_config('aggregation_mode', 'merge')
+
+        aggregated = {}
+
+        if mode == 'merge':
+            if isinstance(variables, dict):
+                aggregated.update(variables)
+        elif mode == 'override':
+            if isinstance(variables, dict):
+                aggregated = variables.copy()
+        elif mode == 'append':
+            for key, value in (variables if isinstance(variables, dict) else {}).items():
+                if key in aggregated and isinstance(aggregated[key], list):
+                    aggregated[key].append(value)
+                else:
+                    aggregated[key] = [value]
+
+        return {'aggregated': aggregated}

src/langbot/pkg/workflow/nodes/wait.py

@@ -0,0 +1,50 @@
+"""Wait Node - pause execution for a duration
+
+Node metadata is loaded from: ../../templates/metadata/nodes/wait.yaml
+"""
+
+from __future__ import annotations
+
+import logging
+from typing import Any
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+
+logger = logging.getLogger(__name__)
+
+# 最大等待时间（秒）
+_MAX_WAIT_SECONDS = 300  # 5 分钟
+
+
+@workflow_node('wait')
+class WaitNode(WorkflowNode):
+    """Wait node - pause execution for a duration"""
+
+    category = 'control'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        import asyncio
+
+        duration = self.get_config('duration', 1)
+        duration_type = self.get_config('duration_type', 'seconds')
+
+        # 转换为秒
+        if duration_type == 'minutes':
+            duration *= 60
+        elif duration_type == 'hours':
+            duration *= 3600
+
+        # 限制最大等待时间
+        if duration > _MAX_WAIT_SECONDS:
+            logger.warning('Wait duration %s exceeds maximum %s, capping to %s',
+                          duration, _MAX_WAIT_SECONDS, _MAX_WAIT_SECONDS)
+            duration = _MAX_WAIT_SECONDS
+
+        # 确保 duration 为正数
+        duration = max(0, duration)
+
+        logger.info('Waiting for %.2f seconds', duration)
+        await asyncio.sleep(duration)
+
+        return {'output': inputs.get('input'), 'waited_seconds': duration}

src/langbot/pkg/workflow/nodes/webhook_trigger.py

@@ -0,0 +1,33 @@
+"""Webhook Trigger Node - triggers workflow via HTTP request
+
+Node metadata is loaded from: ../../templates/metadata/nodes/webhook_trigger.yaml
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+from langbot_plugin.api.entities.builtin.workflow.entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node
+
+@workflow_node('webhook_trigger')
+class WebhookTriggerNode(WorkflowNode):
+    """Webhook trigger node - triggers workflow via HTTP request"""
+
+    category = 'trigger'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        # Safe access to trigger_data which may be None
+        trigger_data = context.trigger_data or {}
+
+        # Filter sensitive headers (Authorization, Cookie, etc.)
+        headers = trigger_data.get('headers', {})
+        safe_headers = {k: v for k, v in headers.items()
+                       if k.lower() not in ('authorization', 'cookie', 'x-api-key', 'x-secret')}
+
+        return {
+            'body': trigger_data.get('body', {}),
+            'headers': safe_headers,
+            'query': trigger_data.get('query', {}),
+            'method': trigger_data.get('method', 'POST'),
+        }

src/langbot/pkg/workflow/registry.py

@@ -0,0 +1,443 @@
+"""Workflow node type registry."""
+
+from __future__ import annotations
+
+import copy
+import logging
+from typing import Any, Optional, TYPE_CHECKING
+
+from .metadata import build_node_type
+from .node import WorkflowNode
+
+if TYPE_CHECKING:
+    from langbot.pkg.discover.engine import ComponentDiscoveryEngine
+
+logger = logging.getLogger(__name__)
+
+
+class NodeConflictError(Exception):
+    """Raised when two workflow node metadata definitions conflict."""
+
+
+class NodeTypeRegistry:
+    """
+    Central registry for workflow node types.
+
+    YAML metadata is the UI-facing source of truth. Python node classes are
+    registered separately and provide execution logic only.
+    """
+
+    _instance: Optional['NodeTypeRegistry'] = None
+
+    def __init__(self):
+        self._nodes: dict[str, type[WorkflowNode]] = {}
+        self._metadata: dict[str, dict[str, Any]] = {}
+        self._metadata_sources: dict[str, str] = {}
+        self._categories: dict[str, list[str]] = {
+            'trigger': [],
+            'process': [],
+            'control': [],
+            'action': [],
+            'integration': [],
+            'misc': [],
+        }
+        self._conflicts: list[dict[str, str]] = []
+
+    @classmethod
+    def instance(cls) -> 'NodeTypeRegistry':
+        """Get singleton instance."""
+        if cls._instance is None:
+            cls._instance = cls()
+        return cls._instance
+
+    def register_metadata(self, metadata: dict[str, Any], source: str = 'core') -> bool:
+        """Register YAML metadata for a workflow node type.
+
+        Core metadata cannot be overridden by plugin metadata. Plugin-plugin
+        conflicts are allowed with a warning so hot-reload/development flows can
+        replace plugin definitions.
+        """
+        node_type = build_node_type(metadata)
+        existing_source = self._metadata_sources.get(node_type)
+
+        if existing_source:
+            conflict = {'type': node_type, 'existing_source': existing_source, 'new_source': source}
+            if existing_source == 'core' and source != 'core':
+                self._conflicts.append(conflict)
+                logger.error('Plugin source %s attempted to override core workflow node %s', source, node_type)
+                return False
+            logger.warning(
+                'Workflow node metadata %s from %s overrides previous source %s', node_type, source, existing_source
+            )
+
+        cached_metadata = copy.deepcopy(metadata)
+        cached_metadata['_source'] = source
+        self._metadata[node_type] = cached_metadata
+        self._metadata_sources[node_type] = source
+        self._add_to_category(metadata.get('category', 'misc'), node_type)
+        return True
+
+    def register(self, node_type: str, node_class: type[WorkflowNode]):
+        """Register a Python workflow node implementation class."""
+        canonical_type = self._canonical_type_for_class(node_type, node_class)
+        self._nodes[canonical_type] = node_class
+
+        metadata = self.get_metadata(canonical_type)
+        if metadata:
+            category = metadata.get('category', getattr(node_class, 'category', 'misc'))
+        else:
+            category = getattr(node_class, 'category', 'misc')
+            logger.warning('Workflow node implementation %s has no YAML metadata', canonical_type)
+
+        self._add_to_category(category, canonical_type)
+
+    def unregister(self, node_type: str):
+        """Unregister a Python workflow node implementation."""
+        canonical_type = self._resolve_registered_node_key(node_type)
+        if canonical_type is None:
+            return
+
+        node_class = self._nodes[canonical_type]
+        metadata = self.get_metadata(canonical_type)
+        category = metadata.get('category') if metadata else getattr(node_class, 'category', 'misc')
+        self._remove_from_category(category or 'misc', canonical_type)
+        del self._nodes[canonical_type]
+
+    def unregister_metadata(self, node_type: str):
+        """Unregister YAML metadata for a node type, primarily for plugin unload."""
+        canonical_type = self._resolve_metadata_key(node_type)
+        if canonical_type is None:
+            return
+
+        metadata = self._metadata[canonical_type]
+        self._remove_from_category(metadata.get('category', 'misc'), canonical_type)
+        del self._metadata[canonical_type]
+        self._metadata_sources.pop(canonical_type, None)
+
+    def get(self, node_type: str) -> Optional[type[WorkflowNode]]:
+        """Get node class by type. Supports both ``category.name`` and short names."""
+        canonical_type = self._resolve_registered_node_key(node_type)
+        if canonical_type:
+            return self._nodes[canonical_type]
+        return None
+
+    def get_metadata(self, node_type: str) -> Optional[dict[str, Any]]:
+        """Get YAML metadata by full type or short node name."""
+        canonical_type = self._resolve_metadata_key(node_type)
+        if canonical_type:
+            return copy.deepcopy(self._metadata[canonical_type])
+        return None
+
+    def create_instance(
+        self, node_type: str, node_id: str, config: dict[str, Any], ap: Optional['app.Application'] = None
+    ) -> Optional[WorkflowNode]:
+        """Create a node instance. Supports both ``category.name`` and short names."""
+        node_class = self.get(node_type)
+        if node_class:
+            return node_class(node_id, config, ap=ap)
+        logger.warning('No workflow node implementation registered for type: %s', node_type)
+        return None
+
+    def get_merged_schema(self, node_type: str) -> Optional[dict[str, Any]]:
+        """Get frontend schema from YAML metadata.
+
+        Python node classes no longer carry UI metadata. If a node class is
+        registered but has no YAML metadata, a minimal schema is generated
+        from the class attributes (category, type_name) so it still appears
+        in the editor.
+        """
+        metadata = self.get_metadata(node_type)
+        node_class = self.get(node_type)
+
+        if metadata:
+            schema = self._metadata_to_schema(metadata)
+            if node_class:
+                # Supplement pipeline config reuse fields from Python class
+                for key in ('config_schema_source', 'config_stages'):
+                    if not schema.get(key) and getattr(node_class, key, None):
+                        schema[key] = getattr(node_class, key)
+            return schema
+
+        if node_class:
+            # Fallback: node has Python class but no YAML metadata
+            short_name = getattr(node_class, 'type_name', '') or node_type.split('.')[-1]
+            category = getattr(node_class, 'category', 'misc')
+            return {
+                'type': f'{category}.{short_name}',
+                'name': short_name,
+                'label': self._normalize_i18n(None, self._prettify_name(short_name)),
+                'description': self._normalize_i18n(None, ''),
+                'category': category,
+                'icon': '',
+                'color': '',
+                'inputs': [],
+                'outputs': [],
+                'config_schema': [],
+                'config_schema_source': getattr(node_class, 'config_schema_source', None),
+                'config_stages': getattr(node_class, 'config_stages', []),
+                'source': 'python-only',
+            }
+
+        return None
+
+    def list_all(self) -> list[dict[str, Any]]:
+        """Get all registered node type schemas, including metadata-only nodes."""
+        node_types = self._ordered_node_types(set(self._metadata.keys()) | set(self._nodes.keys()))
+        return [schema for node_type in node_types if (schema := self.get_merged_schema(node_type)) is not None]
+
+    def list_by_category(self, category: str) -> list[dict[str, Any]]:
+        """Get node type schemas by category."""
+        if category not in self._categories:
+            return []
+        return [schema for node_type in self._categories[category] if (schema := self.get_merged_schema(node_type)) is not None]
+
+    def get_categories(self) -> dict[str, list[dict[str, Any]]]:
+        """Get all nodes organized by category."""
+        return {category: self.list_by_category(category) for category in self._categories.keys()}
+
+    def has_type(self, node_type: str) -> bool:
+        """Check whether a node has metadata or an implementation registered."""
+        return self.get_metadata(node_type) is not None or self.get(node_type) is not None
+
+    def discover_nodes(self, discover_engine: 'ComponentDiscoveryEngine', nodes_dir: str = 'pkg/workflow/nodes/'):
+        """Discover and register workflow nodes from the discovery engine.
+        
+        This method uses the ComponentDiscoveryEngine to find all WorkflowNode
+        subclasses in the specified directory and registers them automatically,
+        replacing the old decorator-based registration mechanism.
+        
+        Args:
+            discover_engine: The ComponentDiscoveryEngine instance
+            nodes_dir: Directory path to scan for workflow nodes
+        """
+        node_classes = discover_engine.discover_workflow_nodes(nodes_dir)
+        for node_class in node_classes:
+            type_name = getattr(node_class, 'type_name', '')
+            if type_name:
+                self.register(type_name, node_class)
+                logger.debug(f'Auto-registered workflow node: {type_name}')
+            else:
+                logger.warning(f'Workflow node class {node_class.__name__} missing type_name attribute')
+
+    def count(self) -> int:
+        """Get total number of node types exposed by metadata or implementation."""
+        return len(set(self._metadata.keys()) | set(self._nodes.keys()))
+
+    def metadata_count(self) -> int:
+        """Get number of registered YAML metadata definitions."""
+        return len(self._metadata)
+
+    def get_conflicts(self) -> list[dict[str, str]]:
+        """Return metadata registration conflicts."""
+        return copy.deepcopy(self._conflicts)
+
+    def clear(self):
+        """Clear all registrations (for testing)."""
+        self._nodes.clear()
+        self._metadata.clear()
+        self._metadata_sources.clear()
+        self._conflicts.clear()
+        for category in self._categories:
+            self._categories[category] = []
+
+    def _canonical_type_for_class(self, node_type: str, node_class: type[WorkflowNode]) -> str:
+        short_name = node_type.split('.')[-1]
+        metadata_key = self._resolve_metadata_key(node_type) or self._resolve_metadata_key(short_name)
+        if metadata_key:
+            return metadata_key
+
+        category = getattr(node_class, 'category', 'misc')
+        return node_type if '.' in node_type else f'{category}.{short_name}'
+
+    def _resolve_registered_node_key(self, node_type: str) -> Optional[str]:
+        if node_type in self._nodes:
+            return node_type
+
+        short_name = node_type.split('.')[-1]
+        for registered_type, node_class in self._nodes.items():
+            if registered_type.split('.')[-1] == short_name or getattr(node_class, 'type_name', None) == short_name:
+                return registered_type
+
+        return None
+
+    def _resolve_metadata_key(self, node_type: str) -> Optional[str]:
+        if node_type in self._metadata:
+            return node_type
+
+        short_name = node_type.split('.')[-1]
+        for registered_type, metadata in self._metadata.items():
+            if registered_type.split('.')[-1] == short_name or metadata.get('name') == short_name:
+                return registered_type
+
+        return None
+
+    def _ordered_node_types(self, node_types: set[str]) -> list[str]:
+        ordered: list[str] = []
+        for category in self._categories:
+            for node_type in self._categories[category]:
+                if node_type in node_types and node_type not in ordered:
+                    ordered.append(node_type)
+
+        for node_type in sorted(node_types):
+            if node_type not in ordered:
+                ordered.append(node_type)
+
+        return ordered
+
+    def _add_to_category(self, category: str, node_type: str) -> None:
+        if category not in self._categories:
+            self._categories[category] = []
+        if node_type not in self._categories[category]:
+            self._categories[category].append(node_type)
+
+    def _remove_from_category(self, category: str, node_type: str) -> None:
+        if category in self._categories and node_type in self._categories[category]:
+            self._categories[category].remove(node_type)
+
+    def _metadata_to_schema(self, metadata: dict[str, Any]) -> dict[str, Any]:
+        node_type = build_node_type(metadata)
+        node_name = metadata.get('name', node_type.split('.')[-1])
+        return {
+            'type': node_type,
+            'name': node_name,
+            'label': self._normalize_i18n(metadata.get('label'), self._prettify_name(node_name)),
+            'description': self._normalize_i18n(metadata.get('description'), ''),
+            'category': metadata.get('category', 'misc'),
+            'icon': metadata.get('icon', ''),
+            'color': metadata.get('color', ''),
+            'inputs': [self._normalize_port_item(item) for item in metadata.get('inputs', [])],
+            'outputs': [self._normalize_port_item(item) for item in metadata.get('outputs', [])],
+            'config_schema': [self._normalize_config_item(item) for item in metadata.get('config', [])],
+            'config_schema_source': metadata.get('config_schema_source'),
+            'config_stages': metadata.get('config_stages', []),
+            'source': metadata.get('_source', 'core'),
+        }
+
+    def _merge_missing_schema_fields(self, yaml_schema: dict[str, Any], python_schema: dict[str, Any]) -> dict[str, Any]:
+        result = copy.deepcopy(yaml_schema)
+        for key in ('config_schema_source', 'config_stages'):
+            if not result.get(key) and python_schema.get(key):
+                result[key] = python_schema[key]
+        return result
+
+    def _normalize_port_item(self, port: dict[str, Any]) -> dict[str, Any]:
+        item = copy.deepcopy(port)
+        name = item.get('name', '')
+        item['label'] = self._normalize_i18n(item.get('label'), self._prettify_name(name))
+        item['description'] = self._normalize_i18n(item.get('description'), '')
+        item.setdefault('type', 'any')
+        item.setdefault('required', True)
+        return item
+
+    def _normalize_config_item(self, config: dict[str, Any]) -> dict[str, Any]:
+        item = copy.deepcopy(config)
+        name = item.get('name', '')
+        frontend_type = self._normalize_config_type(item.get('type', 'string'))
+
+        item['id'] = item.get('id') or name
+        item['type'] = frontend_type
+        item['label'] = self._normalize_i18n(item.get('label'), self._prettify_name(name))
+        item['description'] = self._normalize_i18n(item.get('description'), '')
+        item['required'] = bool(item.get('required', False))
+        item['default'] = item.get('default', self._default_value_for_type(frontend_type))
+
+        if 'options' in item:
+            item['options'] = self._normalize_options(item.get('options'), name)
+
+        return item
+
+    def _normalize_options(self, options: Any, field_name: str) -> list[dict[str, Any]]:
+        if not isinstance(options, list):
+            return []
+
+        normalized: list[dict[str, Any]] = []
+        for option in options:
+            if isinstance(option, dict):
+                option_item = copy.deepcopy(option)
+                option_name = option_item.get('name', option_item.get('value', ''))
+                option_item['name'] = str(option_name)
+                option_item['label'] = self._normalize_i18n(option_item.get('label'), str(option_name))
+                normalized.append(option_item)
+            else:
+                option_name = str(option)
+                normalized.append({'name': option_name, 'label': self._normalize_i18n(None, option_name)})
+
+        return normalized
+
+    def _normalize_i18n(self, value: Any, fallback: str) -> dict[str, str]:
+        if isinstance(value, dict):
+            en_value = (
+                value.get('en_US')
+                or value.get('en-US')
+                or value.get('en')
+                or value.get('en_US'.replace('_', '-'))
+                or fallback
+            )
+            zh_value = value.get('zh_Hans') or value.get('zh-Hans') or value.get('zh-CN') or value.get('zh') or en_value
+            return {
+                'en_US': str(en_value),
+                'en': str(en_value),
+                'en-US': str(en_value),
+                'zh_Hans': str(zh_value),
+                'zh-Hans': str(zh_value),
+                'zh-CN': str(zh_value),
+            }
+
+        if isinstance(value, str) and value:
+            return {
+                'en_US': value,
+                'en': value,
+                'en-US': value,
+                'zh_Hans': value,
+                'zh-Hans': value,
+                'zh-CN': value,
+            }
+
+        return {
+            'en_US': fallback,
+            'en': fallback,
+            'en-US': fallback,
+            'zh_Hans': fallback,
+            'zh-Hans': fallback,
+            'zh-CN': fallback,
+        }
+
+    def _normalize_config_type(self, field_type: str) -> str:
+        type_map = {
+            'number': 'float',
+            'json': 'text',
+            'textarea': 'text',
+        }
+        return type_map.get(field_type, field_type)
+
+    def _default_value_for_type(self, field_type: str) -> Any:
+        if field_type == 'boolean':
+            return False
+        if field_type in {'integer', 'float'}:
+            return 0
+        if field_type in {'array[string]', 'knowledge-base-multi-selector', 'tools-selector'}:
+            return []
+        if field_type == 'model-fallback-selector':
+            return {'primary': '', 'fallbacks': []}
+        if field_type == 'prompt-editor':
+            return [{'role': 'system', 'content': ''}]
+        return ''
+
+    def _prettify_name(self, name: str) -> str:
+        return ' '.join(part.capitalize() for part in str(name).replace('-', '_').split('_') if part)
+
+
+# Convenience functions for module-level access
+def register_node(node_type: str, node_class: type[WorkflowNode]):
+    """Register a node type to the global registry."""
+    NodeTypeRegistry.instance().register(node_type, node_class)
+
+
+def get_node_class(node_type: str) -> Optional[type[WorkflowNode]]:
+    """Get a node class from the global registry."""
+    return NodeTypeRegistry.instance().get(node_type)
+
+
+def list_node_types() -> list[dict[str, Any]]:
+    """List all registered node types."""
+    return NodeTypeRegistry.instance().list_all()

src/langbot/pkg/workflow/safe_eval.py

@@ -0,0 +1,147 @@
+"""Safe expression evaluator for workflow nodes.
+
+Uses Python's ``ast`` module to whitelist only comparison, boolean, arithmetic,
+and simple attribute / subscript access.  No function calls, imports, or
+arbitrary code execution.
+
+The public API is :func:`safe_eval_with_vars` which accepts a mapping of
+allowed variable names so that expressions like ``input == "hello"`` or
+``data.x > 3`` work without resorting to :func:`eval`.
+"""
+
+from __future__ import annotations
+
+import ast
+import operator
+from typing import Any
+
+
+_SAFE_OPS = {
+    # Arithmetic
+    ast.Add: operator.add,
+    ast.Sub: operator.sub,
+    ast.Mult: operator.mul,
+    ast.Div: operator.truediv,
+    ast.FloorDiv: operator.floordiv,
+    ast.Mod: operator.mod,
+    ast.Pow: operator.pow,
+    # Unary
+    ast.USub: operator.neg,
+    ast.UAdd: operator.pos,
+    ast.Not: operator.not_,
+    # Comparison
+    ast.Eq: operator.eq,
+    ast.NotEq: operator.ne,
+    ast.Lt: operator.lt,
+    ast.LtE: operator.le,
+    ast.Gt: operator.gt,
+    ast.GtE: operator.ge,
+    ast.Is: operator.is_,
+    ast.IsNot: operator.is_not,
+    ast.In: lambda a, b: a in b,
+    ast.NotIn: lambda a, b: a not in b,
+}
+
+
+def safe_eval_with_vars(expr: str, variables: dict[str, Any] | None = None) -> Any:
+    """Evaluate an expression safely with an optional variable mapping.
+
+    Supports:
+    - Literals (numbers, strings, booleans, None)
+    - Comparisons (==, !=, <, >, <=, >=, in, not in, is, is not)
+    - Boolean logic (and, or, not)
+    - Arithmetic (+, -, *, /, //, %, **)
+    - Ternary (x if cond else y)
+    - Variable references from *variables* dict (e.g. ``input``, ``data``)
+    - Attribute access on known variables (e.g. ``data.name``)
+    - Subscript access on known variables (e.g. ``data["key"]``, ``items[0]``)
+
+    Raises :class:`ValueError` on any disallowed construct (function calls,
+    starred expressions, walrus operator, etc.).
+    """
+    variables = variables or {}
+    tree = ast.parse(expr.strip(), mode='eval')
+    return _eval_node(tree.body, variables)
+
+
+def _eval_node(node: ast.AST, variables: dict[str, Any]) -> Any:
+    # Literals
+    if isinstance(node, ast.Constant):
+        return node.value
+
+    # Variable references
+    if isinstance(node, ast.Name):
+        if node.id in ('None', 'True', 'False'):
+            return {'None': None, 'True': True, 'False': False}[node.id]
+        if node.id in variables:
+            return variables[node.id]
+        raise ValueError(f'Unsupported variable reference: {node.id}')
+
+    # Attribute access: obj.attr  (only on allowed variables)
+    if isinstance(node, ast.Attribute):
+        obj = _eval_node(node.value, variables)
+        attr = node.attr
+        if isinstance(obj, dict):
+            return obj.get(attr)
+        if hasattr(obj, attr):
+            return getattr(obj, attr)
+        return None
+
+    # Subscript access: obj[key]  (only on allowed variables)
+    if isinstance(node, ast.Subscript):
+        obj = _eval_node(node.value, variables)
+        key = _eval_node(node.slice, variables)
+        try:
+            return obj[key]
+        except (KeyError, IndexError, TypeError):
+            return None
+
+    # Unary operators
+    if isinstance(node, ast.UnaryOp):
+        op_fn = _SAFE_OPS.get(type(node.op))
+        if op_fn is None:
+            raise ValueError(f'Unsupported unary op: {type(node.op).__name__}')
+        return op_fn(_eval_node(node.operand, variables))
+
+    # Binary operators
+    if isinstance(node, ast.BinOp):
+        op_fn = _SAFE_OPS.get(type(node.op))
+        if op_fn is None:
+            raise ValueError(f'Unsupported binary op: {type(node.op).__name__}')
+        return op_fn(_eval_node(node.left, variables), _eval_node(node.right, variables))
+
+    # Comparisons (chained)
+    if isinstance(node, ast.Compare):
+        left = _eval_node(node.left, variables)
+        for op, comparator in zip(node.ops, node.comparators):
+            op_fn = _SAFE_OPS.get(type(op))
+            if op_fn is None:
+                raise ValueError(f'Unsupported comparison: {type(op).__name__}')
+            right = _eval_node(comparator, variables)
+            if not op_fn(left, right):
+                return False
+            left = right
+        return True
+
+    # Boolean operators
+    if isinstance(node, ast.BoolOp):
+        if isinstance(node.op, ast.And):
+            return all(_eval_node(v, variables) for v in node.values)
+        if isinstance(node.op, ast.Or):
+            return any(_eval_node(v, variables) for v in node.values)
+
+    # Ternary
+    if isinstance(node, ast.IfExp):
+        return (
+            _eval_node(node.body, variables) if _eval_node(node.test, variables) else _eval_node(node.orelse, variables)
+        )
+
+    # Tuples / Lists (e.g. ``x in [1, 2, 3]``)
+    if isinstance(node, (ast.Tuple, ast.List)):
+        return [_eval_node(e, variables) for e in node.elts]
+
+    # Dict literals (e.g. ``{"a": 1}``)
+    if isinstance(node, ast.Dict):
+        return {_eval_node(k, variables): _eval_node(v, variables) for k, v in zip(node.keys, node.values)}
+
+    raise ValueError(f'Unsupported expression node: {type(node).__name__}')

src/langbot/pkg/workflow/variable_manager.py

@@ -0,0 +1,185 @@
+"""Variable management for workflow execution.
+
+This module provides utilities for managing workflow variables, including:
+- Reserved variable protection
+- Variable namespace validation
+- Variable inheritance between nodes
+"""
+
+from typing import Set, Dict, Any
+
+# 保留变量列表 - 这些变量由系统管理，不能被用户覆盖
+RESERVED_VARIABLES = {
+    'workflow_id',
+    'execution_id',
+    'node_id',
+    'timestamp',
+    'launcher_type',
+    'trigger_type',
+    'message_id',
+    'execution_status',
+}
+
+
+def get_reserved_variables() -> Set[str]:
+    """获取保留变量列表
+    
+    Returns:
+        保留变量名称的集合
+    """
+    return RESERVED_VARIABLES.copy()
+
+
+def validate_variable_namespace(
+    variables: Dict[str, Any],
+    namespace: str = 'workflow'
+) -> bool:
+    """验证变量命名空间
+    
+    检查变量是否使用了保留的名称。允许不带前缀的变量，但建议使用命名空间前缀。
+    
+    Args:
+        variables: 要验证的变量字典
+        namespace: 命名空间前缀（可选）
+        
+    Returns:
+        True 如果验证通过
+        
+    Raises:
+        ValueError: 如果变量名称与保留变量冲突
+    """
+    reserved = get_reserved_variables()
+    
+    for var_name in variables.keys():
+        if var_name in reserved:
+            raise ValueError(
+                f"Variable '{var_name}' is reserved and cannot be used. "
+                f"Reserved variables: {', '.join(sorted(reserved))}"
+            )
+        
+        # 检查命名空间前缀（可选建议）
+        if namespace and not var_name.startswith(f"{namespace}_"):
+            # 允许不带前缀的变量，但建议使用前缀
+            pass
+    
+    return True
+
+
+def inherit_variables(
+    parent_variables: Dict[str, Any],
+    child_namespace: str
+) -> Dict[str, Any]:
+    """继承父节点变量到子节点
+    
+    将父节点的变量继承到子节点，跳过保留变量，并添加命名空间前缀。
+    
+    Args:
+        parent_variables: 父节点的变量字典
+        child_namespace: 子节点的命名空间前缀
+        
+    Returns:
+        带有命名空间前缀的继承变量字典
+    """
+    inherited = {}
+    
+    for key, value in parent_variables.items():
+        # 跳过保留变量
+        if key in RESERVED_VARIABLES:
+            continue
+        
+        # 添加命名空间前缀
+        namespaced_key = f"{child_namespace}_{key}"
+        inherited[namespaced_key] = value
+    
+    return inherited
+
+
+def merge_variables(
+    base_variables: Dict[str, Any],
+    override_variables: Dict[str, Any],
+    allow_reserved: bool = False
+) -> Dict[str, Any]:
+    """合并变量字典
+    
+    将override_variables合并到base_variables中。
+    
+    Args:
+        base_variables: 基础变量字典
+        override_variables: 要合并的变量字典
+        allow_reserved: 是否允许覆盖保留变量（默认False）
+        
+    Returns:
+        合并后的变量字典
+        
+    Raises:
+        ValueError: 如果尝试覆盖保留变量且allow_reserved=False
+    """
+    result = base_variables.copy()
+    
+    for key, value in override_variables.items():
+        if key in RESERVED_VARIABLES and not allow_reserved:
+            raise ValueError(
+                f"Cannot override reserved variable '{key}'. "
+                f"Set allow_reserved=True to override."
+            )
+        result[key] = value
+    
+    return result
+
+
+def extract_namespace_variables(
+    variables: Dict[str, Any],
+    namespace: str
+) -> Dict[str, Any]:
+    """提取特定命名空间的变量
+    
+    从变量字典中提取具有特定命名空间前缀的变量。
+    
+    Args:
+        variables: 变量字典
+        namespace: 命名空间前缀
+        
+    Returns:
+        提取的变量字典（不包含命名空间前缀）
+    """
+    prefix = f"{namespace}_"
+    result = {}
+    
+    for key, value in variables.items():
+        if key.startswith(prefix):
+            # 移除命名空间前缀
+            clean_key = key[len(prefix):]
+            result[clean_key] = value
+    
+    return result
+
+
+def sanitize_variables(
+    variables: Dict[str, Any],
+    allowed_keys: Set[str] | None = None
+) -> Dict[str, Any]:
+    """清理变量字典
+    
+    移除保留变量和不在允许列表中的变量。
+    
+    Args:
+        variables: 要清理的变量字典
+        allowed_keys: 允许的键集合（如果为None，则允许所有非保留键）
+        
+    Returns:
+        清理后的变量字典
+    """
+    result = {}
+    
+    for key, value in variables.items():
+        # 跳过保留变量
+        if key in RESERVED_VARIABLES:
+            continue
+        
+        # 检查允许列表
+        if allowed_keys is not None and key not in allowed_keys:
+            continue
+        
+        result[key] = value
+    
+    return result

src/langbot/templates/components.yaml

@@ -13,3 +13,6 @@ spec:
     LLMAPIRequester:
       fromDirs:
         - path: pkg/provider/modelmgr/requesters/
+    WorkflowNode:
+      fromDirs:
+        - path: pkg/workflow/nodes/

src/langbot/templates/metadata/nodes/call_pipeline.yaml

@@ -0,0 +1,79 @@
+# Call Pipeline Node Configuration
+name: call_pipeline
+label:
+  en_US: Call Pipeline
+  zh_Hans: 调用 Pipeline
+category: action
+icon: Workflow
+color: '#ef4444'
+description:
+  en_US: Invoke an existing Pipeline for processing
+  zh_Hans: 调用现有的 Pipeline 进行处理
+
+inputs:
+  - name: query
+    type: string
+    label:
+      en_US: Query
+      zh_Hans: 查询
+    description:
+      en_US: Query to send
+      zh_Hans: 要发送的查询
+  - name: context
+    type: object
+    label:
+      en_US: Context
+      zh_Hans: 上下文
+    description:
+      en_US: Context data
+      zh_Hans: 上下文数据
+    required: false
+
+outputs:
+  - name: response
+    type: string
+    label:
+      en_US: Response
+      zh_Hans: 响应
+    description:
+      en_US: Pipeline response
+      zh_Hans: 流水线响应
+  - name: result
+    type: object
+    label:
+      en_US: Result
+      zh_Hans: 结果
+    description:
+      en_US: Pipeline result
+      zh_Hans: 流水线结果
+
+config:
+  - name: pipeline_uuid
+    type: pipeline-selector
+    required: true
+    label:
+      en_US: Pipeline
+      zh_Hans: 流水线
+    description:
+      en_US: Pipeline to call
+      zh_Hans: 要调用的流水线
+
+  - name: inherit_context
+    type: boolean
+    default: true
+    label:
+      en_US: Inherit Context
+      zh_Hans: 继承上下文
+    description:
+      en_US: Whether to inherit context
+      zh_Hans: 是否继承上下文
+
+  - name: timeout
+    type: integer
+    default: 120
+    label:
+      en_US: Timeout (seconds)
+      zh_Hans: 超时时间（秒）
+    description:
+      en_US: Timeout in seconds
+      zh_Hans: 超时时间（秒）

src/langbot/templates/metadata/nodes/call_workflow.yaml

@@ -0,0 +1,79 @@
+# Call Workflow Node Configuration
+name: call_workflow
+label:
+  en_US: Call Workflow
+  zh_Hans: 调用 工作流
+category: action
+icon: Workflow
+color: '#8b5cf6'
+description:
+  en_US: Invoke an existing Workflow for processing
+  zh_Hans: 调用现有的工作流进行处理
+
+inputs:
+  - name: variables
+    type: object
+    label:
+      en_US: Variables
+      zh_Hans: 变量
+    description:
+      en_US: Variables to pass to the called workflow
+      zh_Hans: 传递给被调用工作流的变量
+    required: false
+
+outputs:
+  - name: result
+    type: object
+    label:
+      en_US: Result
+      zh_Hans: 结果
+    description:
+      en_US: Workflow execution result (ExecutionContext)
+      zh_Hans: 工作流执行结果（执行上下文）
+  - name: status
+    type: string
+    label:
+      en_US: Status
+      zh_Hans: 状态
+    description:
+      en_US: Workflow execution status
+      zh_Hans: 工作流执行状态
+  - name: error
+    type: string
+    label:
+      en_US: Error
+      zh_Hans: 错误
+    description:
+      en_US: Error message if execution failed
+      zh_Hans: 执行失败时的错误信息
+
+config:
+  - name: workflow_uuid
+    type: workflow-selector
+    required: true
+    label:
+      en_US: Workflow
+      zh_Hans: 工作流
+    description:
+      en_US: Workflow to call
+      zh_Hans: 要调用的工作流
+
+  - name: inherit_variables
+    type: boolean
+    default: true
+    label:
+      en_US: Inherit Variables
+      zh_Hans: 继承变量
+    description:
+      en_US: Whether to inherit current workflow variables
+      zh_Hans: 是否继承当前工作流的变量
+
+  - name: timeout
+    type: integer
+    default: 300
+    label:
+      en_US: Timeout (seconds)
+      zh_Hans: 超时时间（秒）
+    description:
+      en_US: Timeout in seconds
+      zh_Hans: 超时时间（秒）

src/langbot/templates/metadata/nodes/code_executor.yaml

@@ -0,0 +1,78 @@
+# Code Executor Node Configuration
+# This file defines the metadata for the Code Executor workflow node
+# The corresponding Python implementation is in: pkg/workflow/nodes/code_executor.py
+
+name: code_executor
+label:
+  en_US: Code Executor
+  zh_Hans: 代码执行
+category: process
+icon: Code
+color: '#3b82f6'
+description:
+  en_US: Execute custom code to process data
+  zh_Hans: 执行自定义代码处理数据
+
+inputs:
+  - name: input
+    type: any
+    label:
+      en_US: Input
+      zh_Hans: 输入
+    description:
+      en_US: Input data for the code
+      zh_Hans: 代码的输入数据
+
+outputs:
+  - name: output
+    type: any
+    label:
+      en_US: Output
+      zh_Hans: 输出
+    description:
+      en_US: Code execution result
+      zh_Hans: 代码执行结果
+  - name: logs
+    type: array
+    label:
+      en_US: Logs
+      zh_Hans: 日志
+    description:
+      en_US: Console logs from code execution
+      zh_Hans: 代码执行的控制台日志
+
+config:
+  - name: language
+    type: select
+    required: true
+    default: javascript
+    options:
+      - javascript
+      - python
+    label:
+      en_US: Language
+      zh_Hans: 语言
+    description:
+      en_US: Programming language to use
+      zh_Hans: 要使用的编程语言
+
+  - name: code
+    type: textarea
+    required: true
+    default: "return input;"
+    label:
+      en_US: Code
+      zh_Hans: 代码
+    description:
+      en_US: Code to execute
+      zh_Hans: 要执行的代码
+
+  - name: timeout
+    type: integer
+    default: 5000
+    label:
+      en_US: Timeout (ms)
+      zh_Hans: 超时时间 (毫秒)
+    description:
+      en_US: Maximum execution time in milliseconds
+      zh_Hans: 最大执行时间（毫秒）

src/langbot/templates/metadata/nodes/condition.yaml

@@ -0,0 +1,127 @@
+# Condition Node Configuration
+# This file defines the metadata for the Condition workflow node
+# The corresponding Python implementation is in: pkg/workflow/nodes/condition.py
+
+name: condition
+label:
+  en_US: Condition
+  zh_Hans: 条件分支
+category: control
+icon: GitBranch
+color: '#8b5cf6'
+description:
+  en_US: Branch workflow based on a condition
+  zh_Hans: 根据条件分支工作流
+
+inputs:
+  - name: input
+    type: any
+    label:
+      en_US: Input
+      zh_Hans: 输入
+    description:
+      en_US: Input data for condition evaluation
+      zh_Hans: 用于条件评估的输入数据
+
+outputs:
+  - name: "true"
+    type: any
+    label:
+      en_US: True
+      zh_Hans: 真
+    description:
+      en_US: Output when condition is true
+      zh_Hans: 条件为真时的输出
+  - name: "false"
+    type: any
+    label:
+      en_US: False
+      zh_Hans: 假
+    description:
+      en_US: Output when condition is false
+      zh_Hans: 条件为假时的输出
+
+config:
+  - name: condition_type
+    type: select
+    required: true
+    default: expression
+    options:
+      - expression
+      - comparison
+      - exists
+      - type_check
+    label:
+      en_US: Condition Type
+      zh_Hans: 条件类型
+    description:
+      en_US: Type of condition to evaluate
+      zh_Hans: 要评估的条件类型
+
+  - name: expression
+    type: string
+    default: ""
+    label:
+      en_US: Expression
+      zh_Hans: 表达式
+    description:
+      en_US: JavaScript expression that evaluates to true/false
+      zh_Hans: 评估为 true/false 的表达式
+
+  - name: left_value
+    type: string
+    default: "{{input}}"
+    label:
+      en_US: Left Value
+      zh_Hans: 左值
+    description:
+      en_US: Left side of comparison
+      zh_Hans: 比较的左侧
+
+  - name: operator
+    type: select
+    default: eq
+    options:
+      - eq
+      - neq
+      - gt
+      - gte
+      - lt
+      - lte
+      - contains
+      - starts_with
+      - ends_with
+      - matches
+    label:
+      en_US: Operator
+      zh_Hans: 运算符
+    description:
+      en_US: Comparison operator
+      zh_Hans: 比较运算符
+
+  - name: right_value
+    type: string
+    default: ""
+    label:
+      en_US: Right Value
+      zh_Hans: 右值
+    description:
+      en_US: Right side of comparison
+      zh_Hans: 比较的右侧
+
+  - name: expected_type
+    type: select
+    default: string
+    options:
+      - string
+      - number
+      - boolean
+      - object
+      - array
+      - "null"
+    label:
+      en_US: Expected Type
+      zh_Hans: 期望类型
+    description:
+      en_US: The type to check for
+      zh_Hans: 要检查的类型

src/langbot/templates/metadata/nodes/coze_bot.yaml

@@ -0,0 +1,122 @@
+# Coze Bot Node Configuration
+name: coze_bot
+label:
+  en_US: Coze Bot
+  zh_Hans: Coze Bot
+description:
+  en_US: Call Coze API bot
+  zh_Hans: 调用扣子 API 机器人
+category: integration
+icon: MessageSquare
+color: '#3b82f6'
+
+inputs:
+  - name: query
+    type: string
+    label:
+      en_US: Query
+      zh_Hans: 查询
+    description:
+      en_US: User input/query
+      zh_Hans: 用户输入/查询
+    required: true
+  - name: conversation_id
+    type: string
+    label:
+      en_US: Conversation ID
+      zh_Hans: 会话 ID
+    description:
+      en_US: Conversation ID
+      zh_Hans: 会话 ID
+    required: false
+
+outputs:
+  - name: answer
+    type: string
+    label:
+      en_US: Answer
+      zh_Hans: 答案
+    description:
+      en_US: Bot response
+      zh_Hans: 机器人回复
+  - name: conversation_id
+    type: string
+    label:
+      en_US: Conversation ID
+      zh_Hans: 会话 ID
+    description:
+      en_US: Conversation ID
+      zh_Hans: 会话 ID
+  - name: success
+    type: boolean
+    label:
+      en_US: Success
+      zh_Hans: 成功
+    description:
+      en_US: Whether the call was successful
+      zh_Hans: 调用是否成功
+
+config:
+  - name: api-key
+    label:
+      en_US: API Key
+      zh_Hans: API 密钥
+    description:
+      en_US: Coze API key
+      zh_Hans: Coze API 密钥
+    type: string
+    required: true
+    default: ''
+
+  - name: bot-id
+    label:
+      en_US: Bot ID
+      zh_Hans: 机器人 ID
+    description:
+      en_US: ID of the bot to run
+      zh_Hans: 要运行的机器人 ID
+    type: string
+    required: true
+    default: ''
+
+  - name: api-base
+    label:
+      en_US: API Base URL
+      zh_Hans: API 基础 URL
+    description:
+      en_US: Base URL for Coze API
+      zh_Hans: Coze API 基础 URL
+    type: string
+    required: true
+    default: 'https://api.coze.cn'
+    options:
+      - name: 'https://api.coze.cn'
+        label:
+          en_US: Coze China
+          zh_Hans: Coze 中国版
+      - name: 'https://api.coze.com'
+        label:
+          en_US: Coze Global
+          zh_Hans: Coze 全球版
+
+  - name: auto-save-history
+    label:
+      en_US: Auto Save History
+      zh_Hans: 自动保存历史
+    description:
+      en_US: Whether to automatically save conversation history
+      zh_Hans: 是否自动保存对话历史
+    type: boolean
+    required: false
+    default: true
+
+  - name: timeout
+    label:
+      en_US: Request Timeout (seconds)
+      zh_Hans: 请求超时（秒）
+    description:
+      en_US: Timeout in seconds for API requests
+      zh_Hans: API 请求超时时间（秒）
+    type: number
+    required: false
+    default: 120

src/langbot/templates/metadata/nodes/cron_trigger.yaml

@@ -0,0 +1,85 @@
+# Cron Trigger Node Configuration
+# This file defines the metadata for the Cron Trigger workflow node
+# The corresponding Python implementation is in: pkg/workflow/nodes/cron_trigger.py
+
+name: cron_trigger
+label:
+  en_US: Scheduled Trigger
+  zh_Hans: 定时触发
+category: trigger
+icon: Timer
+color: '#22c55e'
+description:
+  en_US: Trigger workflow on a scheduled time
+  zh_Hans: 按定时计划触发工作流
+
+inputs: []
+
+outputs:
+  - name: trigger_time
+    type: datetime
+    label:
+      en_US: Trigger Time
+      zh_Hans: 触发时间
+    description:
+      en_US: The time when the trigger fired
+      zh_Hans: 触发器触发的时间
+  - name: context
+    type: object
+    label:
+      en_US: Context
+      zh_Hans: 上下文
+    description:
+      en_US: Trigger context information
+      zh_Hans: 触发上下文信息
+
+config:
+  - name: cron_expression
+    type: string
+    required: true
+    default: "0 9 * * *"
+    label:
+      en_US: Cron Expression
+      zh_Hans: Cron 表达式
+    description:
+      en_US: Standard cron expression
+      zh_Hans: 标准 Cron 表达式
+
+  - name: timezone
+    type: select
+    required: true
+    default: "Asia/Shanghai"
+    options:
+      - UTC
+      - Asia/Shanghai
+      - Asia/Tokyo
+      - America/New_York
+      - America/Los_Angeles
+      - Europe/London
+      - Europe/Berlin
+    label:
+      en_US: Timezone
+      zh_Hans: 时区
+    description:
+      en_US: Timezone for the cron schedule
+      zh_Hans: Cron 计划的时区
+
+  - name: description
+    type: string
+    default: ""
+    label:
+      en_US: Description
+      zh_Hans: 描述
+    description:
+      en_US: Description of this scheduled trigger
+      zh_Hans: 此定时触发器的描述
+
+  - name: enabled
+    type: boolean
+    default: true
+    label:
+      en_US: Enabled
+      zh_Hans: 启用
+    description:
+      en_US: Whether this scheduled trigger is active
+      zh_Hans: 此定时触发器是否激活

src/langbot/templates/metadata/nodes/data_transform.yaml

@@ -0,0 +1,72 @@
+# Data Transform Node Configuration
+# This file defines the metadata for the Data Transform workflow node
+# The corresponding Python implementation is in: pkg/workflow/nodes/data_transform.py
+
+name: data_transform
+label:
+  en_US: Data Transform
+  zh_Hans: 数据转换
+category: process
+icon: ArrowRightLeft
+color: '#3b82f6'
+description:
+  en_US: Transform data using templates or JSONPath
+  zh_Hans: 使用模板或 JSONPath 转换数据
+
+inputs:
+  - name: data
+    type: any
+    required: true
+    label:
+      en_US: Data
+      zh_Hans: 数据
+    description:
+      en_US: Input data
+      zh_Hans: 输入数据
+
+outputs:
+  - name: result
+    type: any
+    label:
+      en_US: Result
+      zh_Hans: 结果
+    description:
+      en_US: Transform result
+      zh_Hans: 转换结果
+
+config:
+  - name: transform_type
+    type: select
+    required: true
+    default: template
+    options:
+      - template
+      - jsonpath
+      - jmespath
+      - expression
+    label:
+      en_US: Transform Type
+      zh_Hans: 转换类型
+    description:
+      en_US: Type of transformation to perform
+      zh_Hans: 要执行的转换类型
+
+  - name: template
+    type: textarea
+    default: ""
+    label:
+      en_US: Template
+      zh_Hans: 模板
+    description:
+      en_US: Template with {{variable}} syntax
+      zh_Hans: 支持 {{variable}} 语法的模板
+
+  - name: expression
+    type: string
+    default: ""
+    label:
+      en_US: Expression
+      zh_Hans: 表达式
+    description:
+      en_US: JSONPath/JMESPath expression
+      zh_Hans: JSONPath/JMESPath 表达式

src/langbot/templates/metadata/nodes/database_query.yaml

@@ -0,0 +1,115 @@
+# Database Query Node Configuration
+# This file defines the metadata for the Database Query workflow node
+# The corresponding Python implementation is in: pkg/workflow/nodes/database_query.py
+
+name: database_query
+label:
+  en_US: Database Query
+  zh_Hans: 数据库查询
+category: integration
+icon: Database
+color: '#ec4899'
+description:
+  en_US: Execute database queries
+  zh_Hans: 执行数据库查询
+
+inputs:
+  - name: parameters
+    type: object
+    required: false
+    label:
+      en_US: Parameters
+      zh_Hans: 参数
+    description:
+      en_US: Query parameters
+      zh_Hans: 查询参数
+
+outputs:
+  - name: results
+    type: array
+    label:
+      en_US: Results
+      zh_Hans: 结果
+    description:
+      en_US: Query results
+      zh_Hans: 查询结果
+  - name: row_count
+    type: number
+    label:
+      en_US: Row Count
+      zh_Hans: 行数
+    description:
+      en_US: Number of rows affected/returned
+      zh_Hans: 影响/返回的行数
+  - name: success
+    type: boolean
+    label:
+      en_US: Success
+      zh_Hans: 成功
+    description:
+      en_US: Whether query was successful
+      zh_Hans: 查询是否成功
+
+config:
+  - name: connection_type
+    type: select
+    required: true
+    default: postgresql
+    options:
+      - postgresql
+      - mysql
+      - sqlite
+    label:
+      en_US: Database Type
+      zh_Hans: 数据库类型
+    description:
+      en_US: Type of database to connect to
+      zh_Hans: 要连接的数据库类型
+
+  - name: connection_string
+    type: string
+    required: true
+    default: ""
+    label:
+      en_US: Connection String
+      zh_Hans: 连接字符串
+    description:
+      en_US: Database connection string
+      zh_Hans: 数据库连接字符串
+
+  - name: query
+    type: textarea
+    required: true
+    default: ""
+    label:
+      en_US: SQL Query
+      zh_Hans: SQL 查询
+    description:
+      en_US: SQL query to execute
+      zh_Hans: 要执行的 SQL 查询
+
+  - name: query_type
+    type: select
+    required: true
+    default: select
+    options:
+      - select
+      - insert
+      - update
+      - delete
+    label:
+      en_US: Query Type
+      zh_Hans: 查询类型
+    description:
+      en_US: Type of query operation
+      zh_Hans: 查询操作的类型
+
+  - name: timeout
+    type: integer
+    default: 30
+    label:
+      en_US: Timeout (seconds)
+      zh_Hans: 超时时间（秒）
+    description:
+      en_US: Query timeout
+      zh_Hans: 查询超时时间

src/langbot/templates/metadata/nodes/dify_knowledge_query.yaml

@@ -0,0 +1,74 @@
+# Dify Knowledge Base Query Node Configuration
+name: dify_knowledge_query
+label:
+  en_US: Dify Knowledge Base
+  zh_Hans: Dify 知识库
+description:
+  en_US: Query Dify knowledge base
+  zh_Hans: 查询 Dify 知识库
+category: integration
+icon: BookOpen
+color: '#3b82f6'
+
+inputs:
+  - name: query
+    type: string
+    label:
+      en_US: Query
+      zh_Hans: 查询
+    description:
+      en_US: Query content
+      zh_Hans: 查询内容
+    required: true
+
+outputs:
+  - name: results
+    type: array
+    label:
+      en_US: Results
+      zh_Hans: 结果
+    description:
+      en_US: Search results
+      zh_Hans: 检索结果
+  - name: success
+    type: boolean
+    label:
+      en_US: Success
+      zh_Hans: 成功
+    description:
+      en_US: Whether the call was successful
+      zh_Hans: 调用是否成功
+
+config:
+  - name: base-url
+    label:
+      en_US: Base URL
+      zh_Hans: 基础 URL
+    description:
+      en_US: Dify service base URL
+      zh_Hans: Dify 服务基础 URL
+    type: string
+    required: true
+    default: 'https://api.dify.ai/v1'
+
+  - name: api-key
+    label:
+      en_US: API Key
+      zh_Hans: API 密钥
+    description:
+      en_US: Dify API key
+      zh_Hans: Dify API 密钥
+    type: string
+    required: true
+    default: ''
+
+  - name: dataset_id
+    label:
+      en_US: Dataset ID
+      zh_Hans: 知识库 ID
+    description:
+      en_US: Knowledge base ID
+      zh_Hans: 知识库 ID
+    type: string
+    required: true
+    default: ''

src/langbot/templates/metadata/nodes/dify_workflow.yaml

@@ -0,0 +1,120 @@
+# Dify Workflow Node Configuration
+name: dify_workflow
+label:
+  en_US: Dify Workflow
+  zh_Hans: Dify 工作流
+description:
+  en_US: Call Dify service API
+  zh_Hans: 调用 Dify 服务 API
+category: integration
+icon: Bot
+color: '#3b82f6'
+
+inputs:
+  - name: query
+    type: string
+    label:
+      en_US: Query
+      zh_Hans: 查询
+    description:
+      en_US: User input/query
+      zh_Hans: 用户输入/查询
+    required: true
+  - name: conversation_id
+    type: string
+    label:
+      en_US: Conversation ID
+      zh_Hans: 会话 ID
+    description:
+      en_US: Conversation ID for multi-turn dialogue
+      zh_Hans: 多轮对话的会话 ID
+    required: false
+
+outputs:
+  - name: answer
+    type: string
+    label:
+      en_US: Answer
+      zh_Hans: 答案
+    description:
+      en_US: Answer from Dify
+      zh_Hans: Dify 返回的答案
+  - name: conversation_id
+    type: string
+    label:
+      en_US: Conversation ID
+      zh_Hans: 会话 ID
+    description:
+      en_US: Conversation ID
+      zh_Hans: 会话 ID
+  - name: success
+    type: boolean
+    label:
+      en_US: Success
+      zh_Hans: 成功
+    description:
+      en_US: Whether the call was successful
+      zh_Hans: 调用是否成功
+
+config:
+  - name: base-url
+    label:
+      en_US: Base URL
+      zh_Hans: 基础 URL
+    description:
+      en_US: Dify service base URL
+      zh_Hans: Dify 服务基础 URL
+    type: string
+    required: true
+    default: 'https://api.dify.ai/v1'
+    options:
+      - name: 'https://api.dify.ai/v1'
+        label:
+          en_US: Dify Cloud
+          zh_Hans: Dify 云服务
+
+  - name: base-prompt
+    label:
+      en_US: Base PROMPT
+      zh_Hans: 基础提示词
+    description:
+      en_US: When Dify receives a message with empty input (only images), it will pass this default prompt into it.
+      zh_Hans: 当 Dify 接收到输入文字为空（仅图片）的消息时，传入该默认提示词
+    type: string
+    required: true
+    default: "When the file content is readable, please read the content of this file. When the file is an image, describe the content of this image."
+
+  - name: app-type
+    label:
+      en_US: App Type
+      zh_Hans: 应用类型
+    description:
+      en_US: Application type
+      zh_Hans: 应用类型
+    type: select
+    required: true
+    default: chat
+    options:
+      - name: chat
+        label:
+          en_US: Chat (including Chatflow)
+          zh_Hans: 聊天（包括Chatflow）
+      - name: agent
+        label:
+          en_US: Agent
+          zh_Hans: Agent
+      - name: workflow
+        label:
+          en_US: Workflow
+          zh_Hans: 工作流
+
+  - name: api-key
+    label:
+      en_US: API Key
+      zh_Hans: API 密钥
+    description:
+      en_US: Dify API key
+      zh_Hans: Dify API 密钥
+    type: string
+    required: true
+    default: ''

src/langbot/templates/metadata/nodes/end.yaml

@@ -0,0 +1,53 @@
+# End Node Configuration
+# This file defines the metadata for the End workflow node
+# The corresponding Python implementation is in: pkg/workflow/nodes/end.py
+
+name: end
+label:
+  en_US: End
+  zh_Hans: 结束
+category: control
+icon: PauseCircle
+color: '#8b5cf6'
+description:
+  en_US: End the workflow execution
+  zh_Hans: 结束工作流执行
+
+inputs:
+  - name: input
+    type: any
+    required: false
+    label:
+      en_US: Input
+      zh_Hans: 输入
+    description:
+      en_US: Final output data
+      zh_Hans: 最终输出数据
+
+outputs: []
+
+config:
+  - name: status
+    type: select
+    required: true
+    default: success
+    options:
+      - success
+      - failed
+      - cancelled
+    label:
+      en_US: End Status
+      zh_Hans: 结束状态
+    description:
+      en_US: Status to report when workflow ends
+      zh_Hans: 工作流结束时报告的状态
+
+  - name: message
+    type: string
+    default: ""
+    label:
+      en_US: Message
+      zh_Hans: 消息
+    description:
+      en_US: Optional message to include with the end status
+      zh_Hans: 与结束状态一起包含的可选消息

src/langbot/templates/metadata/nodes/event_trigger.yaml

@@ -0,0 +1,89 @@
+# Event Trigger Node Configuration
+# This file defines the metadata for the Event Trigger workflow node
+# The corresponding Python implementation is in: pkg/workflow/nodes/event_trigger.py
+
+name: event_trigger
+label:
+  en_US: Event Trigger
+  zh_Hans: 事件触发
+category: trigger
+icon: Bell
+color: '#22c55e'
+description:
+  en_US: Trigger workflow when a system event occurs
+  zh_Hans: 当系统事件发生时触发工作流
+
+inputs: []
+
+outputs:
+  - name: event
+    type: object
+    label:
+      en_US: Event
+      zh_Hans: 事件
+    description:
+      en_US: The event data
+      zh_Hans: 事件数据
+  - name: event_type
+    type: string
+    label:
+      en_US: Event Type
+      zh_Hans: 事件类型
+    description:
+      en_US: Type of the event
+      zh_Hans: 事件类型
+  - name: context
+    type: object
+    label:
+      en_US: Context
+      zh_Hans: 上下文
+    description:
+      en_US: Event context information
+      zh_Hans: 事件上下文信息
+
+config:
+  - name: event_type
+    type: select
+    required: true
+    default: member_join
+    options:
+      - member_join
+      - member_leave
+      - message_recall
+      - group_created
+      - group_disbanded
+      - bot_added
+      - bot_removed
+      - friend_request
+      - group_request
+    label:
+      en_US: Event Type
+      zh_Hans: 事件类型
+    description:
+      en_US: The type of system event to listen for
+      zh_Hans: 要监听的系统事件类型
+
+  - name: source_filter
+    type: select
+    required: true
+    default: all
+    options:
+      - all
+      - group
+      - private
+    label:
+      en_US: Source Filter
+      zh_Hans: 来源筛选
+    description:
+      en_US: Filter events by source
+      zh_Hans: 按来源筛选事件
+
+  - name: platforms
+    type: json
+    default: []
+    label:
+      en_US: Platform Filter
+      zh_Hans: 平台筛选
+    description:
+      en_US: Only trigger for events from these platforms
+      zh_Hans: 仅对来自这些平台的事件触发

src/langbot/templates/metadata/nodes/http_request.yaml

@@ -0,0 +1,162 @@
+# HTTP Request Node Configuration
+# This file defines the metadata for the HTTP Request workflow node
+# The corresponding Python implementation is in: pkg/workflow/nodes/http_request.py
+
+name: http_request
+label:
+  en_US: HTTP Request
+  zh_Hans: HTTP 请求
+category: action
+icon: Globe
+color: '#10b981'
+description:
+  en_US: Make HTTP requests to external APIs
+  zh_Hans: 向外部 API 发送 HTTP 请求
+
+inputs:
+  - name: body
+    type: any
+    required: false
+    label:
+      en_US: Body
+      zh_Hans: 请求体
+    description:
+      en_US: Request body data
+      zh_Hans: 请求体数据
+  - name: variables
+    type: object
+    required: false
+    label:
+      en_US: Variables
+      zh_Hans: 变量
+    description:
+      en_US: Variables for URL/header templates
+      zh_Hans: URL/请求头模板的变量
+
+outputs:
+  - name: response
+    type: any
+    label:
+      en_US: Response
+      zh_Hans: 响应
+    description:
+      en_US: Response body
+      zh_Hans: 响应体
+  - name: status_code
+    type: number
+    label:
+      en_US: Status Code
+      zh_Hans: 状态码
+    description:
+      en_US: HTTP status code
+      zh_Hans: HTTP 状态码
+  - name: headers
+    type: object
+    label:
+      en_US: Headers
+      zh_Hans: 响应头
+    description:
+      en_US: Response headers
+      zh_Hans: 响应头
+  - name: success
+    type: boolean
+    label:
+      en_US: Success
+      zh_Hans: 成功
+    description:
+      en_US: Whether request was successful
+      zh_Hans: 请求是否成功
+
+config:
+  - name: method
+    type: select
+    required: true
+    default: GET
+    options:
+      - GET
+      - POST
+      - PUT
+      - PATCH
+      - DELETE
+    label:
+      en_US: Method
+      zh_Hans: 方法
+    description:
+      en_US: HTTP method
+      zh_Hans: HTTP 方法
+
+  - name: url
+    type: string
+    required: true
+    default: ""
+    label:
+      en_US: URL
+      zh_Hans: URL
+    description:
+      en_US: Request URL
+      zh_Hans: 请求 URL
+
+  - name: headers
+    type: json
+    default: "{}"
+    label:
+      en_US: Headers
+      zh_Hans: 请求头
+    description:
+      en_US: Request headers as JSON
+      zh_Hans: 请求头（JSON 格式）
+
+  - name: body_type
+    type: select
+    default: json
+    options:
+      - none
+      - json
+      - form
+      - raw
+    label:
+      en_US: Body Type
+      zh_Hans: 请求体类型
+    description:
+      en_US: Type of request body
+      zh_Hans: 请求体的类型
+
+  - name: body_template
+    type: textarea
+    default: ""
+    label:
+      en_US: Body Template
+      zh_Hans: 请求体模板
+    description:
+      en_US: Request body template
+      zh_Hans: 请求体模板
+
+  - name: timeout
+    type: integer
+    default: 30
+    label:
+      en_US: Timeout (seconds)
+      zh_Hans: 超时时间（秒）
+    description:
+      en_US: Request timeout in seconds
+      zh_Hans: 请求超时时间（秒）
+
+  - name: retry_count
+    type: integer
+    default: 0
+    label:
+      en_US: Retry Count
+      zh_Hans: 重试次数
+    description:
+      en_US: Number of retries on failure
+      zh_Hans: 失败时的重试次数
+
+  - name: ignore_ssl
+    type: boolean
+    default: false
+    label:
+      en_US: Ignore SSL Errors
+      zh_Hans: 忽略 SSL 错误
+    description:
+      en_US: Ignore SSL certificate verification errors
+      zh_Hans: 忽略 SSL 证书验证错误

src/langbot/templates/metadata/nodes/iterator.yaml

@@ -0,0 +1,80 @@
+# Iterator Node Configuration
+name: iterator
+label:
+  en_US: Iterator
+  zh_Hans: 迭代器
+category: control
+icon: Repeat
+color: '#f59e0b'
+description:
+  en_US: Iterate over array elements one by one
+  zh_Hans: 逐个遍历数组元素
+
+inputs:
+  - name: array
+    type: array
+    label:
+      en_US: Array
+      zh_Hans: 数组
+    description:
+      en_US: Array to iterate
+      zh_Hans: 要迭代的数组
+
+outputs:
+  - name: item
+    type: any
+    label:
+      en_US: Item
+      zh_Hans: 项目
+    description:
+      en_US: Current item
+      zh_Hans: 当前项目
+  - name: index
+    type: integer
+    label:
+      en_US: Index
+      zh_Hans: 索引
+    description:
+      en_US: Current index
+      zh_Hans: 当前索引
+  - name: is_first
+    type: boolean
+    label:
+      en_US: Is First
+      zh_Hans: 是否第一个
+    description:
+      en_US: Whether this is the first item
+      zh_Hans: 是否是第一个项目
+  - name: is_last
+    type: boolean
+    label:
+      en_US: Is Last
+      zh_Hans: 是否最后一个
+    description:
+      en_US: Whether this is the last item
+      zh_Hans: 是否是最后一个项目
+
+config:
+  - name: parallel
+    type: boolean
+    default: false
+    label:
+      en_US: Parallel
+      zh_Hans: 并行
+    description:
+      en_US: Whether to process in parallel
+      zh_Hans: 是否并行处理
+
+  - name: max_concurrency
+    type: integer
+    default: 5
+    min_value: 1
+    max_value: 100
+    label:
+      en_US: Max Concurrency
+      zh_Hans: 最大并发数
+    description:
+      en_US: Maximum concurrent tasks
+      zh_Hans: 最大并发任务数
+    show_if:
+      parallel: true

src/langbot/templates/metadata/nodes/knowledge_retrieval.yaml

@@ -0,0 +1,118 @@
+# Knowledge Retrieval Node Configuration
+# This file defines the metadata for the Knowledge Retrieval workflow node
+# The corresponding Python implementation is in: pkg/workflow/nodes/knowledge_retrieval.py
+
+name: knowledge_retrieval
+label:
+  en_US: Knowledge Retrieval
+  zh_Hans: 知识库检索
+category: process
+icon: Search
+color: '#8b5cf6'
+description:
+  en_US: Retrieve relevant information from knowledge bases
+  zh_Hans: 从知识库中检索相关信息
+
+inputs:
+  - name: query
+    type: string
+    label:
+      en_US: Query
+      zh_Hans: 查询
+    description:
+      en_US: Query text to search for
+      zh_Hans: 要搜索的查询文本
+
+outputs:
+  - name: results
+    type: array
+    label:
+      en_US: Results
+      zh_Hans: 结果
+    description:
+      en_US: Retrieved documents/chunks
+      zh_Hans: 检索到的文档/块
+  - name: context
+    type: string
+    label:
+      en_US: Context
+      zh_Hans: 上下文
+    description:
+      en_US: Concatenated text from all results
+      zh_Hans: 所有结果的连接文本
+  - name: scores
+    type: array
+    label:
+      en_US: Scores
+      zh_Hans: 分数
+    description:
+      en_US: Similarity scores for each result
+      zh_Hans: 每个结果的相似度分数
+
+config:
+  - name: knowledge_bases
+    type: knowledge-base-multi-selector
+    required: true
+    default: []
+    label:
+      en_US: Knowledge Bases
+      zh_Hans: 知识库
+    description:
+      en_US: Select knowledge bases to search
+      zh_Hans: 选择要搜索的知识库
+
+  - name: top_k
+    type: integer
+    default: 5
+    label:
+      en_US: Top K Results
+      zh_Hans: 返回数量 (Top K)
+    description:
+      en_US: Number of top results to retrieve
+      zh_Hans: 返回的最相关结果数量
+
+  - name: similarity_threshold
+    type: number
+    default: 0.5
+    label:
+      en_US: Similarity Threshold
+      zh_Hans: 相似度阈值
+    description:
+      en_US: Minimum similarity score for results
+      zh_Hans: 结果的最小相似度分数
+
+  - name: retrieval_mode
+    type: select
+    default: vector
+    options:
+      - vector
+      - hybrid
+      - keyword
+    label:
+      en_US: Retrieval Mode
+      zh_Hans: 检索模式
+    description:
+      en_US: Method used for retrieving documents
+      zh_Hans: 用于检索文档的方法
+
+  - name: rerank_enabled
+    type: boolean
+    default: false
+    label:
+      en_US: Enable Reranking
+      zh_Hans: 启用重排序
+    description:
+      en_US: Use a reranking model to improve result relevance
+      zh_Hans: 使用重排序模型提高结果相关性
+
+  - name: rerank_model
+    type: rerank-model-selector
+    default: ""
+    label:
+      en_US: Rerank Model
+      zh_Hans: 重排序模型
+    description:
+      en_US: Model to use for reranking results
+      zh_Hans: 用于结果重排序的模型
+    show_if:
+      rerank_enabled: true

src/langbot/templates/metadata/nodes/langflow_flow.yaml

@@ -0,0 +1,107 @@
+# Langflow Flow Node Configuration
+name: langflow_flow
+label:
+  en_US: Langflow Flow
+  zh_Hans: Langflow 流程
+description:
+  en_US: Call Langflow API
+  zh_Hans: 调用 Langflow API
+category: integration
+icon: GitBranch
+color: '#3b82f6'
+
+inputs:
+  - name: input_value
+    type: string
+    label:
+      en_US: Input Value
+      zh_Hans: 输入内容
+    description:
+      en_US: Input content
+      zh_Hans: 输入内容
+    required: true
+
+outputs:
+  - name: result
+    type: any
+    label:
+      en_US: Result
+      zh_Hans: 结果
+    description:
+      en_US: Flow execution result
+      zh_Hans: 流程执行结果
+  - name: success
+    type: boolean
+    label:
+      en_US: Success
+      zh_Hans: 成功
+    description:
+      en_US: Whether the call was successful
+      zh_Hans: 调用是否成功
+
+config:
+  - name: base-url
+    label:
+      en_US: Base URL
+      zh_Hans: 基础 URL
+    description:
+      en_US: Langflow server base URL
+      zh_Hans: Langflow 服务器基础 URL
+    type: string
+    required: true
+    default: 'http://localhost:7860'
+
+  - name: api-key
+    label:
+      en_US: API Key
+      zh_Hans: API 密钥
+    description:
+      en_US: Langflow API key
+      zh_Hans: Langflow API 密钥
+    type: string
+    required: true
+    default: ''
+
+  - name: flow-id
+    label:
+      en_US: Flow ID
+      zh_Hans: 流程 ID
+    description:
+      en_US: Flow ID to run
+      zh_Hans: 要运行的流程 ID
+    type: string
+    required: true
+    default: ''
+
+  - name: input-type
+    label:
+      en_US: Input Type
+      zh_Hans: 输入类型
+    description:
+      en_US: Input type for the flow
+      zh_Hans: 流程的输入类型
+    type: string
+    required: false
+    default: chat
+
+  - name: output-type
+    label:
+      en_US: Output Type
+      zh_Hans: 输出类型
+    description:
+      en_US: Output type for the flow
+      zh_Hans: 流程的输出类型
+    type: string
+    required: false
+    default: chat
+
+  - name: tweaks
+    label:
+      en_US: Tweaks
+      zh_Hans: 调整参数
+    description:
+      en_US: Optional tweaks to apply to the flow
+      zh_Hans: 可选的流程调整参数
+    type: json
+    required: false
+    default: '{}'

src/langbot/templates/metadata/nodes/llm_call.yaml

@@ -0,0 +1,230 @@
+# LLM Call Node Configuration
+# This file defines the metadata for the LLM Call workflow node
+# The corresponding Python implementation is in: pkg/workflow/nodes/llm_call.py
+
+name: llm_call
+label:
+  en_US: LLM Call
+  zh_Hans: LLM 调用
+category: process
+icon: Brain
+color: '#8b5cf6'
+description:
+  en_US: Call a large language model to generate responses
+  zh_Hans: 调用大语言模型生成响应
+
+inputs:
+  - name: input
+    type: string
+    required: false
+    label:
+      en_US: Input
+      zh_Hans: 输入
+    description:
+      en_US: Input text to send to the model
+      zh_Hans: 发送到模型的输入文本
+  - name: context
+    type: object
+    required: false
+    label:
+      en_US: Context
+      zh_Hans: 上下文
+    description:
+      en_US: Additional context data
+      zh_Hans: 额外的上下文数据
+
+outputs:
+  - name: response
+    type: string
+    label:
+      en_US: Response
+      zh_Hans: 响应
+    description:
+      en_US: Model response text
+      zh_Hans: 模型响应文本
+  - name: usage
+    type: object
+    label:
+      en_US: Usage
+      zh_Hans: 使用量
+    description:
+      en_US: Token usage information
+      zh_Hans: Token 使用量信息
+  - name: parsed
+    type: object
+    label:
+      en_US: Parsed
+      zh_Hans: 解析结果
+    description:
+      en_US: Parsed output (if output format is JSON)
+      zh_Hans: 解析后的输出（如果输出格式为 JSON）
+
+config:
+  - name: model_config
+    type: model-fallback-selector
+    required: true
+    default:
+      primary: ''
+      fallbacks: []
+    label:
+      en_US: Model Configuration
+      zh_Hans: 模型配置
+    description:
+      en_US: Configure the primary model and optional fallback models
+      zh_Hans: 配置主模型和可选的备用模型
+
+  - name: prompt
+    label:
+      en_US: Prompt
+      zh_Hans: 提示词
+    description:
+      en_US: Unless you understand the message structure, please only use a single system prompt
+      zh_Hans: 除非您了解消息结构，否则请只使用 system 单提示词
+    type: prompt-editor
+    required: true
+    default:
+      - role: system
+        content: "You are a helpful assistant."
+
+  - name: max_round
+    type: integer
+    required: false
+    default: 10
+    label:
+      en_US: Max Round
+      zh_Hans: 最大回合数
+    description:
+      en_US: The maximum number of previous messages that the agent can remember
+      zh_Hans: 最大前文消息回合数
+
+  - name: knowledge_bases
+    type: knowledge-base-multi-selector
+    required: false
+    default: []
+    label:
+      en_US: Knowledge Bases
+      zh_Hans: 知识库
+    description:
+      en_US: Configure the knowledge bases to use for the agent, if not selected, the agent will directly use the LLM to reply
+      zh_Hans: 配置用于提升回复质量的知识库，若不选择，则直接使用大模型回复
+
+  - name: rerank_model
+    type: rerank-model-selector
+    required: false
+    default: ''
+    label:
+      en_US: Rerank Model
+      zh_Hans: 重排序模型
+    description:
+      en_US: Optional rerank model to improve retrieval quality by re-scoring retrieved chunks
+      zh_Hans: 可选的重排序模型，通过重新评分检索结果来提升检索质量
+
+  - name: rerank_top_k
+    type: integer
+    required: false
+    default: 5
+    label:
+      en_US: Rerank Top K
+      zh_Hans: 重排序保留数量
+    description:
+      en_US: Number of top results to keep after reranking
+      zh_Hans: 重排序后保留的最相关结果数量
+
+  - name: temperature
+    type: number
+    default: 0.7
+    label:
+      en_US: Temperature
+      zh_Hans: 温度
+    description:
+      en_US: Controls randomness in responses
+      zh_Hans: 控制响应的随机性
+
+  - name: max_tokens
+    type: integer
+    default: 0
+    label:
+      en_US: Max Tokens
+      zh_Hans: 最大令牌数
+    description:
+      en_US: Maximum number of tokens to generate
+      zh_Hans: 生成的最大令牌数
+
+  - name: output_format
+    type: select
+    default: text
+    options:
+      - text
+      - json
+      - markdown
+    label:
+      en_US: Output Format
+      zh_Hans: 输出格式
+    description:
+      en_US: Expected format of the model output
+      zh_Hans: 模型输出的预期格式
+
+  - name: json_schema
+    type: textarea
+    default: ""
+    label:
+      en_US: JSON Schema
+      zh_Hans: JSON Schema
+    description:
+      en_US: JSON schema for structured output validation
+      zh_Hans: 用于结构化输出验证的 JSON Schema
+
+  - name: exception_handling
+    type: select
+    required: true
+    default: show-hint
+    options:
+      - name: show-error
+        label:
+          en_US: Show Full Error
+          zh_Hans: 显示完整报错信息
+      - name: show-hint
+        label:
+          en_US: Show Failure Hint
+          zh_Hans: 仅文字提示
+      - name: hide
+        label:
+          en_US: Hide All
+          zh_Hans: 不显示任何异常信息
+    label:
+      en_US: Exception Handling Strategy
+      zh_Hans: 异常处理策略
+    description:
+      en_US: Controls how error messages are displayed to the user when an AI request fails
+      zh_Hans: 控制 AI 请求失败时向用户展示错误信息的方式
+
+  - name: failure_hint
+    type: string
+    required: false
+    default: 'Request failed.'
+    label:
+      en_US: Failure Hint Text
+      zh_Hans: 失败提示文本
+    description:
+      en_US: The text to display when a request fails. Only effective when Exception Handling Strategy is set to "Show Failure Hint"
+      zh_Hans: 请求失败时显示的提示文本，仅在异常处理策略设置为"仅文字提示"时生效
+
+  - name: remove_think
+    type: boolean
+    default: false
+    label:
+      en_US: Remove CoT
+      zh_Hans: 删除思维链
+    description:
+      en_US: 'If enabled, the model thinking content in the response will be automatically removed. Note: When using streaming response, removing CoT may cause the first token to wait for a long time.'
+      zh_Hans: '如果启用，将自动删除大模型回复中的模型思考内容。注意：当您使用流式响应时，删除思维链可能会导致首个 Token 的等待时间过长'
+
+  - name: track_function_calls
+    type: boolean
+    default: false
+    label:
+      en_US: Track Function Calls
+      zh_Hans: 跟踪函数调用
+    description:
+      en_US: If enabled, the Agent will output a hint to the user each time a tool is called
+      zh_Hans: 启用后，Agent 每次调用工具时都会输出一个提示给用户

src/langbot/templates/metadata/nodes/loop.yaml

@@ -0,0 +1,117 @@
+# Loop Node Configuration
+# This file defines the metadata for the Loop workflow node
+# The corresponding Python implementation is in: pkg/workflow/nodes/loop.py
+
+name: loop
+label:
+  en_US: Loop
+  zh_Hans: 循环
+category: control
+icon: Repeat
+color: '#8b5cf6'
+description:
+  en_US: Iterate over items or repeat until condition
+  zh_Hans: 遍历项目或重复直到满足条件
+
+inputs:
+  - name: items
+    type: array
+    required: false
+    label:
+      en_US: Items
+      zh_Hans: 项目
+    description:
+      en_US: Items to iterate over
+      zh_Hans: 要遍历的项目
+
+outputs:
+  - name: item
+    type: any
+    label:
+      en_US: Item
+      zh_Hans: 当前项
+    description:
+      en_US: Current item in iteration
+      zh_Hans: 迭代中的当前项
+  - name: index
+    type: number
+    label:
+      en_US: Index
+      zh_Hans: 索引
+    description:
+      en_US: Current iteration index
+      zh_Hans: 当前迭代索引
+  - name: completed
+    type: any
+    label:
+      en_US: Completed
+      zh_Hans: 完成
+    description:
+      en_US: Output after loop completes
+      zh_Hans: 循环完成后的输出
+
+config:
+  - name: loop_type
+    type: select
+    required: true
+    default: foreach
+    options:
+      - foreach
+      - while
+      - count
+    label:
+      en_US: Loop Type
+      zh_Hans: 循环类型
+    description:
+      en_US: Type of loop to execute
+      zh_Hans: 要执行的循环类型
+
+  - name: max_iterations
+    type: integer
+    default: 100
+    label:
+      en_US: Max Iterations
+      zh_Hans: 最大迭代次数
+    description:
+      en_US: Maximum number of iterations
+      zh_Hans: 最大迭代次数
+
+  - name: count
+    type: integer
+    default: 10
+    label:
+      en_US: Count
+      zh_Hans: 计数
+    description:
+      en_US: Number of times to iterate
+      zh_Hans: 迭代次数
+
+  - name: while_condition
+    type: string
+    default: ""
+    label:
+      en_US: While Condition
+      zh_Hans: While 条件
+    description:
+      en_US: Condition expression to continue looping
+      zh_Hans: 继续循环的条件表达式
+
+  - name: parallel
+    type: boolean
+    default: false
+    label:
+      en_US: Parallel Execution
+      zh_Hans: 并行执行
+    description:
+      en_US: Execute iterations in parallel
+      zh_Hans: 并行执行迭代
+
+  - name: parallel_limit
+    type: integer
+    default: 5
+    label:
+      en_US: Parallel Limit
+      zh_Hans: 并行限制
+    description:
+      en_US: Maximum number of parallel executions
+      zh_Hans: 最大并行执行数

src/langbot/templates/metadata/nodes/mcp_tool.yaml

@@ -0,0 +1,88 @@
+# Mcp Tool Node Configuration
+# This file defines the metadata for the Mcp Tool workflow node
+# The corresponding Python implementation is in: pkg/workflow/nodes/mcp_tool.py
+
+name: mcp_tool
+label:
+  en_US: MCP Tool
+  zh_Hans: MCP 工具
+category: integration
+icon: Wrench
+color: '#ec4899'
+description:
+  en_US: Invoke an MCP (Model Context Protocol) tool
+  zh_Hans: 调用 MCP 工具
+inputs:
+- name: arguments
+  type: object
+  required: false
+  label:
+    en_US: Arguments
+    zh_Hans: 参数
+  description:
+    en_US: Tool arguments
+    zh_Hans: 工具参数
+outputs:
+- name: result
+  type: any
+  label:
+    en_US: Result
+    zh_Hans: 结果
+  description:
+    en_US: Tool execution result
+    zh_Hans: 工具执行结果
+- name: success
+  type: boolean
+  label:
+    en_US: Success
+    zh_Hans: 成功
+  description:
+    en_US: Whether tool call was successful
+    zh_Hans: 工具调用是否成功
+- name: error
+  type: string
+  label:
+    en_US: Error
+    zh_Hans: 错误
+  description:
+    en_US: Error message if failed
+    zh_Hans: 失败时的错误信息
+config:
+- name: server_name
+  type: string
+  required: true
+  default: ''
+  label:
+    en_US: MCP Server
+    zh_Hans: MCP 服务器
+  description:
+    en_US: Name of the MCP server
+    zh_Hans: MCP 服务器名称
+- name: tool_name
+  type: string
+  required: true
+  default: ''
+  label:
+    en_US: Tool Name
+    zh_Hans: 工具名称
+  description:
+    en_US: Name of the MCP tool to invoke
+    zh_Hans: 要调用的 MCP 工具名称
+- name: arguments_template
+  type: textarea
+  default: ''
+  label:
+    en_US: Arguments Template
+    zh_Hans: 参数模板
+  description:
+    en_US: Tool arguments as JSON
+    zh_Hans: 工具参数（JSON 格式）
+- name: timeout
+  type: integer
+  default: 30
+  label:
+    en_US: Timeout (seconds)
+    zh_Hans: 超时时间（秒）
+  description:
+    en_US: Maximum execution time
+    zh_Hans: 最大执行时间

src/langbot/templates/metadata/nodes/memory_store.yaml

@@ -0,0 +1,99 @@
+# Memory Store Node Configuration
+# This file defines the metadata for the Memory Store workflow node
+# The corresponding Python implementation is in: pkg/workflow/nodes/memory_store.py
+
+name: memory_store
+label:
+  en_US: Memory Store
+  zh_Hans: 记忆存储
+category: integration
+icon: HardDrive
+color: '#ec4899'
+description:
+  en_US: Store and retrieve data from workflow memory
+  zh_Hans: 从工作流记忆中存储和检索数据
+
+inputs:
+  - name: value
+    type: any
+    required: false
+    label:
+      en_US: Value
+      zh_Hans: 值
+    description:
+      en_US: Value to store
+      zh_Hans: 要存储的值
+
+outputs:
+  - name: result
+    type: any
+    label:
+      en_US: Result
+      zh_Hans: 结果
+    description:
+      en_US: Retrieved or stored value
+      zh_Hans: 检索到的或存储的值
+  - name: success
+    type: boolean
+    label:
+      en_US: Success
+      zh_Hans: 成功
+    description:
+      en_US: Whether operation was successful
+      zh_Hans: 操作是否成功
+
+config:
+  - name: operation
+    type: select
+    required: true
+    default: get
+    options:
+      - get
+      - set
+      - delete
+      - append
+      - list
+    label:
+      en_US: Operation
+      zh_Hans: 操作
+    description:
+      en_US: Memory operation to perform
+      zh_Hans: 要执行的记忆操作
+
+  - name: key
+    type: string
+    required: true
+    default: ""
+    label:
+      en_US: Key
+      zh_Hans: 键
+    description:
+      en_US: Memory key
+      zh_Hans: 记忆键
+
+  - name: scope
+    type: select
+    required: true
+    default: execution
+    options:
+      - execution
+      - workflow
+      - session
+      - user
+      - global
+    label:
+      en_US: Scope
+      zh_Hans: 作用域
+    description:
+      en_US: Scope of the memory storage
+      zh_Hans: 记忆存储的作用域
+
+  - name: ttl
+    type: integer
+    default: 0
+    label:
+      en_US: TTL (seconds)
+      zh_Hans: TTL（秒）
+    description:
+      en_US: Time to live (0 = no expiry)
+      zh_Hans: 过期时间（0 = 不过期）

src/langbot/templates/metadata/nodes/merge.yaml

@@ -0,0 +1,77 @@
+# Merge Node Configuration
+name: merge
+label:
+  en_US: Merge
+  zh_Hans: 合并
+category: control
+icon: GitMerge
+color: '#f59e0b'
+description:
+  en_US: Merge multiple branches back together
+  zh_Hans: 将多个分支合并在一起
+
+inputs:
+  - name: input_1
+    type: any
+    label:
+      en_US: Input 1
+      zh_Hans: 输入 1
+    description:
+      en_US: First input
+      zh_Hans: 第一个输入
+  - name: input_2
+    type: any
+    label:
+      en_US: Input 2
+      zh_Hans: 输入 2
+    description:
+      en_US: Second input
+      zh_Hans: 第二个输入
+  - name: input_3
+    type: any
+    label:
+      en_US: Input 3
+      zh_Hans: 输入 3
+    description:
+      en_US: Third input
+      zh_Hans: 第三个输入
+    required: false
+  - name: input_4
+    type: any
+    label:
+      en_US: Input 4
+      zh_Hans: 输入 4
+    description:
+      en_US: Fourth input
+      zh_Hans: 第四个输入
+    required: false
+
+outputs:
+  - name: merged
+    type: object
+    label:
+      en_US: Merged
+      zh_Hans: 合并结果
+    description:
+      en_US: Merged result
+      zh_Hans: 合并后的结果
+  - name: array
+    type: array
+    label:
+      en_US: Array
+      zh_Hans: 数组
+    description:
+      en_US: All inputs as array
+      zh_Hans: 所有输入作为数组
+
+config:
+  - name: merge_strategy
+    type: select
+    options: ["object", "array", "first_non_null", "concat"]
+    default: "object"
+    label:
+      en_US: Merge Strategy
+      zh_Hans: 合并策略
+    description:
+      en_US: Strategy for merging inputs
+      zh_Hans: 合并输入的策略

src/langbot/templates/metadata/nodes/message_trigger.yaml

@@ -0,0 +1,105 @@
+# Message Trigger Node Configuration
+# This file defines the metadata for the Message Trigger workflow node
+# The corresponding Python implementation is in: pkg/workflow/nodes/message_trigger.py
+
+name: message_trigger
+label:
+  en_US: Message Trigger
+  zh_Hans: 消息触发
+category: trigger
+icon: MessageSquare
+color: '#22c55e'
+description:
+  en_US: Trigger workflow when a message is received
+  zh_Hans: 当收到消息时触发工作流
+
+inputs: []
+
+outputs:
+  - name: message
+    type: object
+    label:
+      en_US: Message
+      zh_Hans: 消息
+    description:
+      en_US: The received message object
+      zh_Hans: 接收到的消息对象
+  - name: sender
+    type: object
+    label:
+      en_US: Sender
+      zh_Hans: 发送者
+    description:
+      en_US: Message sender information
+      zh_Hans: 消息发送者信息
+  - name: context
+    type: object
+    label:
+      en_US: Context
+      zh_Hans: 上下文
+    description:
+      en_US: Message context information
+      zh_Hans: 消息上下文信息
+
+config:
+  - name: match_type
+    type: select
+    required: true
+    default: all
+    options:
+      - all
+      - prefix
+      - regex
+      - contains
+      - exact
+    label:
+      en_US: Match Type
+      zh_Hans: 匹配类型
+    description:
+      en_US: How to match the incoming message
+      zh_Hans: 如何匹配收到的消息
+
+  - name: match_pattern
+    type: string
+    default: ""
+    label:
+      en_US: Match Pattern
+      zh_Hans: 匹配模式
+    description:
+      en_US: The pattern to match against the message
+      zh_Hans: 用于匹配消息的模式
+
+  - name: message_source
+    type: select
+    required: true
+    default: all
+    options:
+      - all
+      - group
+      - private
+    label:
+      en_US: Message Source
+      zh_Hans: 消息来源
+    description:
+      en_US: Filter messages by source type
+      zh_Hans: 按来源类型筛选消息
+
+  - name: platforms
+    type: json
+    default: []
+    label:
+      en_US: Platform Filter
+      zh_Hans: 平台筛选
+    description:
+      en_US: Only trigger for messages from these platforms
+      zh_Hans: 仅对来自这些平台的消息触发
+
+  - name: ignore_bot_messages
+    type: boolean
+    default: true
+    label:
+      en_US: Ignore Bot Messages
+      zh_Hans: 忽略机器人消息
+    description:
+      en_US: Do not trigger for messages sent by bots
+      zh_Hans: 不对机器人发送的消息触发