simple_server.py

#!/usr/bin/env python3
"""Minimaler MCP Server - zeigt nur ein Tool"""

import asyncio
from mcp.server import Server
from mcp.server.stdio import stdio_server
from mcp.types import Tool, TextContent

app = Server("minimal-server")


@app.list_tools()
async def list_tools() -> list[Tool]:
    return [
        Tool(
            name="add",
            description="Addiert zwei Zahlen",
            inputSchema={
                "type": "object",
                "properties": {
                    "a": {"type": "number"},
                    "b": {"type": "number"}
                },
                "required": ["a", "b"]
            }
        )
    ]


@app.call_tool()
async def call_tool(name: str, arguments: dict) -> list[TextContent]:
    if name == "add":
        result = arguments["a"] + arguments["b"]
        return [TextContent(type="text", text=f"{arguments['a']} + {arguments['b']} = {result}")]

    raise ValueError(f"Unbekanntes Tool: {name}")


async def main():
    async with stdio_server() as (read_stream, write_stream):
        await app.run(read_stream, write_stream, app.create_initialization_options())


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