feat(agent-runner): support host tool lookup (#2244)

src/langbot/pkg/provider/tools/loaders/mcp.py

@@ -567,6 +567,13 @@ class MCPLoader(loader.ToolLoader):
                     return True
         return False
 
+    async def get_tool(self, name: str) -> resource_tool.LLMTool | None:
+        for session in self.sessions.values():
+            for function in session.get_tools():
+                if function.name == name:
+                    return function
+        return None
+
     async def invoke_tool(self, name: str, parameters: dict, query: pipeline_query.Query) -> typing.Any:
         """执行工具调用"""
         for session in self.sessions.values():