先写一个工具
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import subprocess
import shlex
from mcp.server.fastmcp import FastMCP
from typing import Annotated
from pydantic import Field, BaseModelmcp = 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.stderrreturn ret.stdoutexcept 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.
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from langchain_mcp_adapters.client import MultiServerMCPClientclient = 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)