Make url optional for mcp-stdio

Signed-off-by: Anuradha Karuppiah <[email protected]>

Author: AnuradhaKaruppiah

src/aiq/tool/mcp/mcp_tool.py

@@ -33,7 +33,7 @@ class MCPToolConfig(FunctionBaseConfig, name="mcp_tool_wrapper"):
     function.
     """
     # Add your custom configuration parameters here
-    url: HttpUrl = Field(description="The URL of the MCP server (for SSE mode)")
+    url: HttpUrl | None = Field(default=None, description="The URL of the MCP server (for SSE mode)")
     mcp_tool_name: str = Field(description="The name of the tool served by the MCP Server that you want to use")
     client_type: str = Field(default="sse", description="The type of client to use ('sse' or 'stdio')")
     command: str | None = Field(default=None, description="The command to run for stdio mode (e.g. 'mcp-server')")
@@ -64,6 +64,8 @@ async def mcp_tool(config: MCPToolConfig, builder: Builder):  # pylint: disable=
             raise ValueError("command is required when using stdio client type")
         client = MCPBuilder(url=config.command, client_type=config.client_type, args=config.args)
     else:
+        if not config.url:
+            raise ValueError("url is required when using sse client type")
         client = MCPBuilder(url=str(config.url), client_type=config.client_type)
 
     tool: MCPToolClient = await client.get_tool(config.mcp_tool_name)