将原来的 functioncall 重构为 mcp #61

{
    "mcp": {
        "servers": {
            "my-tavily-mcp": {
                "type": "stdio",
                "command": "npx",
                "args": [
                    "-y",
                    "tavily-mcp@0.1.3"
                ],
                "env": {
                    "TAVILY_API_KEY": "tvly-*"
                }
            }
        }
    }
}