FastMCP

FastMCP 🚀

Move fast and make things.

*Made with 💙 by [Prefect](https://www.prefect.io/)*

[](https://gofastmcp.com) [](https://discord.gg/uu8dJCgttd) [](https://pypi.org/project/fastmcp) [](https://github.com/PrefectHQ/fastmcp/actions/workflows/run-tests.yml) [](https://github.com/PrefectHQ/fastmcp/blob/main/LICENSE)

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The [Model Context Protocol](https://modelcontextprotocol.io/) (MCP) connects LLMs to tools and data. FastMCP gives you everything you need to go from prototype to production:

from fastmcp import FastMCP

mcp = FastMCP("Demo 🚀")

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

if __name__ == "__main__":
    mcp.run()

Why FastMCP

Building an effective MCP application is harder than it looks. FastMCP handles all of it. Declare a tool with a Python function, and the schema, validation, and documentation are generated automatically. Connect to a server with a URL, and transport negotiation, authentication, and protocol lifecycle are managed for you. You focus on your logic, and the MCP part just works: **with FastMCP, best practices are built in.**

**That's why FastMCP is the standard framework for working with MCP.** FastMCP 1.0 was incorporated into the official MCP Python SDK in 2024. Today, the actively maintained standalone project is downloaded a million times a day, and some version of FastMCP powers 70% of MCP servers across all languages.

FastMCP has three pillars:

Servers

Expose tools, resources, and prompts to LLMs.

Apps

Give your tools interactive UIs rendered directly in the conversation.

Clients

Connect to any MCP server — local or remote, programmatic or CLI.

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