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MCP Python SDK

The Model Context Protocol (MCP) allows applications to provide context for LLMs in a standardized way, separating the concerns of providing context from the actual LLM interaction.

This Python SDK implements the full MCP specification, making it easy to:

  • Build MCP servers that expose resources, prompts, and tools
  • Create MCP clients that can connect to any MCP server
  • Use standard transports like stdio, SSE, and Streamable HTTP

If you want to read more about the specification, please visit the MCP documentation.

Quick Example

Here's a simple MCP server that exposes a tool, resource, and prompt:

server.py
from mcp.server.fastmcp import FastMCP mcp = FastMCP("Test Server") @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:  """Get a personalized greeting""" return f"Hello, {name}!" @mcp.prompt() def greet_user(name: str, style: str = "friendly") -> str:  """Generate a greeting prompt""" return f"Write a {style} greeting for someone named {name}."

Test it with the MCP Inspector:

uv run mcp dev server.py

Getting Started

  1. Install the MCP SDK
  2. Learn concepts - understand the three primitives and architecture
  3. Explore authorization - add security to your servers
  4. Use low-level APIs - for advanced customization

API Reference

Full API documentation is available in the API Reference.