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

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+"""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, ClassVar
+
+from ..entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node, NodePort, NodeConfig
+
+
+@workflow_node('mcp_tool')
+class MCPToolNode(WorkflowNode):
+    """MCP tool node - invoke MCP (Model Context Protocol) tools"""
+
+    # Node type for registration
+    type_name = "mcp_tool"
+    
+    # Category and icon - these are not i18n
+    category = "integration"
+    icon = "Wrench"
+    
+    # Name and description - i18n handled on frontend side
+    # Frontend will use node type key to look up translation
+    name = "mcp_tool"
+    description = "mcp_tool"
+    name_zh = "MCP 工具"
+    name_en = "MCP Tool"
+    description_zh = "调用 MCP 工具"
+    description_en = "Invoke an MCP (Model Context Protocol) tool"
+    
+    # Inputs/outputs/config - loaded from YAML at runtime
+    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]:
+        """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,
+            },
+        }