MCP Python SDK

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GitHub Python MIT

Description

MCP Python SDK is the official Python implementation for building MCP servers and agent-side integrations with a standardized tool protocol.

Key Features

  • FastMCP high-level interface — quickly define MCP Server tools, resources and prompts with decorators
  • Multi-transport support — supports stdio, SSE and Streamable HTTP standard transport methods
  • Structured output — tool return values automatically serialized into structured JSON responses
  • Resource and prompt system — expose data via Resources, define interaction templates via Prompts
  • OAuth authentication support — built-in OAuth authentication flow in client
  • ASGI mounting — mountable into existing FastAPI/Starlette apps as sub-applications

Use Cases

💡 Quickly build MCP Servers exposing database query capabilities for LLM applications
💡 Wrap existing Python APIs into MCP-compatible tool services for agent invocation
💡 Build local MCP Servers connected to Claude Desktop for tool extensions
💡 Mount MCP Servers in FastAPI apps to provide standardized LLM context interfaces
💡 Build MCP clients to connect to and invoke any standard MCP Server

Tags

mcp python sdk protocol

Categories

🔌 MCP Tools

Quick Start

uv init mcp-server-demo
cd mcp-server-demo
uv add "mcp[cli]"

# server.py
from mcp.server.fastmcp import FastMCP

mcp = FastMCP("Demo", json_response=True)

@mcp.tool()
def add(a: int, b: int) -> int:
    """Add two numbers"""
    return a + b

@mcp.resource("greeting://{name}")
def get_greeting(name: str) -> str:
    return f"Hello, {name}!"

if __name__ == "__main__":
    mcp.run(transport="streamable-http")
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