docs: add tools API, tools-selector config type, and OpenAPI tools endpoints

- Plugin SDK APIs: list_tools, get_tool_detail, call_tool (zh/en/ja)
- Config type: tools-selector for multi-select tool picker (zh/en/ja)
- OpenAPI: GET /api/v1/tools, GET /api/v1/tools/{tool_name} (zh/en/ja)

en/plugin/dev/apis/common.mdx

@@ -249,6 +249,87 @@ parsers = await self.plugin.list_parsers(mime_type="application/pdf")
 # Each item includes plugin_id, plugin_author, plugin_name, name, description, supported_mime_types
 ```
 
+### List All Available Tools
+
+List all available tools in the current LangBot instance (including plugin tools and MCP tools).
+
+```python
+async def list_tools(self) -> list[dict[str, Any]]:
+    """List all available tools
+
+    Returns:
+        A list of tool dicts, each containing:
+        - name: Tool name
+        - label: Display label (i18n)
+        - description: Tool description (i18n)
+        - icon: Tool icon
+        - spec: Tool specification (includes llm_prompt and parameters)
+    """
+
+# Example
+tools = await self.plugin.list_tools()
+for tool in tools:
+    print(f"Tool: {tool['name']}")
+```
+
+### Get Tool Detail
+
+Get detailed information about a specific tool.
+
+```python
+async def get_tool_detail(self, tool_name: str) -> dict[str, Any]:
+    """Get detailed information about a specific tool
+
+    Args:
+        tool_name: Tool name (metadata.name, e.g. "get_weather_alerts")
+
+    Returns:
+        Tool detail dict containing name, label, description, spec (with parameters and llm_prompt)
+    """
+
+# Example
+detail = await self.plugin.get_tool_detail("get_weather_alerts")
+print(detail['spec']['parameters'])
+```
+
+### Call Tool
+
+Call a specific tool.
+
+```python
+async def call_tool(
+    self,
+    tool_name: str,
+    parameters: dict[str, Any],
+    session: dict[str, Any],
+    query_id: int,
+) -> dict[str, Any]:
+    """Call a specific tool
+
+    Args:
+        tool_name: Tool name (metadata.name)
+        parameters: Tool parameters
+        session: Session info
+        query_id: Query ID
+
+    Returns:
+        Tool response dict
+    """
+
+# Example
+result = await self.plugin.call_tool(
+    tool_name="get_weather_alerts",
+    parameters={"state": "CA"},
+    session={},
+    query_id=0,
+)
+print(result)
+```
+
+<Tip>
+Tool names use `metadata.name` (e.g. `echo_tool`, `get_weather_alerts`), without author or plugin name prefix.
+</Tip>
+
 ### Set Plugin Persistent Data
 
 Persistently store plugin data. Data stored through this interface can only be accessed by this plugin. Values need to be converted to bytes manually.

en/plugin/dev/basic-info.mdx

@@ -50,7 +50,7 @@ For example:
 spec:
   config:
     - name: github_token  # Required; configuration item name, used for retrieval in the plugin
-      type: string  # Required; configuration item type, supports string, integer, float, boolean, select, prompt-editor, llm-model-selector, bot-selector, etc.
+      type: string  # Required; configuration item type, supports string, integer, float, boolean, select, prompt-editor, llm-model-selector, bot-selector, tools-selector, etc.
       label:  # Required; configuration item display name, supports multilingual. Language codes follow RFC 4646 standard.
         en_US: Github Token
         zh_Hans: Github Token
@@ -274,6 +274,33 @@ bot_uuid = self.get_config()['bot']
 print(bot_uuid)  # Output: '550e8400-e29b-41d4-a716-446655440000'
 ```
 
+### type: tools-selector
+
+Tool selector. Displays a multi-select tool selector where you can choose registered tools (plugin tools and MCP tools), with the final result represented as an array of tool names.
+
+```yaml
+- name: selected_tools
+  type: tools-selector
+  ...
+```
+
+Using the selected tool names in the plugin:
+
+```python
+# Get selected tool names from config
+selected_tools = self.get_config()['selected_tools']
+print(selected_tools)  # Output: ['get_weather_alerts', 'web_search']
+
+# Call selected tools
+for tool_name in selected_tools:
+    result = await self.plugin.call_tool(
+        tool_name=tool_name,
+        parameters={"query": "hello"},
+        session={},
+        query_id=0,
+    )
+```
+
 ## What's Next
 
 This tutorial will guide you through step-by-step completion of plugin functionality.