stdio mcp

先写一个工具

点击查看代码

import subprocess
import shlex
from mcp.server.fastmcp import FastMCP
from typing import Annotated
from pydantic import Field, BaseModel

mcp = FastMCP()

@mcp.tool(name="run_shell"
          ,description="run a shell command"
          )
def run_shell_command(
    command: Annotated[str, Field(description="shell command will be executed", examples="ls -al")]
    , timeout: Annotated[int, Field(description="expired time command faile")]) -> str:
    try:
        # shell=True 只能执行第一个命令，无法处理数组
        ret = subprocess.run(command, shell=True, capture_output=True, text=True, timeout=timeout)
        if ret.returncode != 0:
            return ret.stderr
        return ret.stdout
    except Exception as e:
        print(e)

if __name__ == "__main__":
    mcp.run(transport="stdio")

Client launches server as a subprocess and communicates via standard input/output. Best for local tools and simple setups.

点击查看代码

from langchain_mcp_adapters.client import MultiServerMCPClient

client = MultiServerMCPClient(
    {
        "给工具起个名字": {
            "transport": "stdio",
            "command": "python",
            "args": ["工具的路径"],
        }
    }
)

tools = await client.get_tools()  
agent = create_agent("claude-sonnet-4-5-20250929", tools)