Python FastMCP构建MCP服务端与客户端的详细步骤

pip install fastmcp

from fastmcp import FastMCP

# 初始化 MCP 服务实例
mcp = FastMCP(name="MyServer")

# 定义一个工具函数
@mcp.tool
def greet(name: str) -> str:
    """Greet a user by name."""
    return f"Hello, {name}!"

if __name__ == "__main__":
    # 启动服务（Streamable HTTP 模式）
    mcp.run(transport="streamable-http", host="127.0.0.1", port=9000)

import asyncio
from fastmcp import Client

# 配置 MCP 服务器地址
config = {
    "mcpServers": {
        "printer": {
            "url": "http://127.0.0.1:9000/mcp",
            "transport": "streamable-http"
        }
    }
}

# 初始化客户端
client = Client(config)

async def main():
    async with client:
        # 调用服务端工具
        greet_data = await client.call_tool("greet", {"name": "world"})
        print(f"greet: {greet_data}")

if __name__ == "__main__":
    asyncio.run(main())

python server.py

python client.py

# my_server.py
from fastmcp import FastMCP

mcp = FastMCP(name="MyServer")


@mcp.tool
def greet(name: str) -> str:
    """Greet a user by name."""
    return f"Hello, {name}!"


if __name__ == "__main__":
    # This runs the server, defaulting to STDIO transport
    mcp.run(transport="streamable-http", host="127.0.0.1", port=9000)

    # To use a different transport, e.g., HTTP:
    # mcp.run(transport="streamable-http", host="127.0.0.1", port=9000)

import asyncio

from fastmcp import Client

# Create a standard MCP configuration with multiple servers
config = {
    "mcpServers": {
        # A local MCP server
        "printer": {
            "url": "http://127.0.0.1:9000/mcp",
            "transport": "streamable-http"
        }

    }
}

# Create a client that connects to both servers
client = Client(config)


async def main():
    async with client:
        # Access tools from different servers with prefixes
        greet_data = await client.call_tool("greet", {"name": "word"})

        print(f"greet: {greet_data}")


if __name__ == "__main__":
    asyncio.run(main())