FastMCP is an open-source Python framework for building servers, clients and apps that use the Model Context Protocol (MCP).
In plain words
MCP is a standard way to connect language models to tools and data. Building an MCP server by hand means handling schemas, validation, transport and authentication. With FastMCP you write an ordinary Python function, mark it as a tool, and the framework generates the rest. It can also act as a client that connects to other MCP servers. In 2024 its first version became part of the MCP project's own Python SDK.
A quick example
A developer writes a small Python function that adds two numbers, puts FastMCP's tool decorator on it and runs the server. An MCP-capable assistant can now discover and call that add tool.
Where you'll meet it
- Building MCP servers in Python.
- Connecting Python code to MCP servers as a client.
Related
Sources
- DocsFastMCP README, Prefect (GitHub) · read 29 Sept 2026
- DocsFastMCP: The Framework for MCP, FastMCP docs · read 29 Sept 2026
- DocsPrefectHQ/fastmcp, Prefect (GitHub) · read 29 Sept 2026
Checked by WhatIsAI against the sources above · 29 Sept 2026. Spotted an error? Report it.