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Developer building blocks

FastMCP

A Python toolkit for building the connectors that let AI assistants use your tools and data.

What it does

MCP (Model Context Protocol) is a standard way to connect AI assistants like Claude or ChatGPT to outside tools and data. FastMCP is a Python framework that makes building those connections, called MCP servers and clients, much simpler.

A programmer writes an ordinary Python function and FastMCP handles the technical details, such as describing it to the AI, checking inputs, sign-in and communication. It can also give tools small interactive screens that appear right in the AI conversation. Its makers say an early version became part of the official MCP Python toolkit, and a TypeScript version is also available.

Who it's for

Developers who want to plug their own tools or data into AI assistants.

Can I use it without coding?

Developers only. A Python library for programmers. New to this? Start here.

Can I run it?

Cost
FreeNothing to pay or sign up for.
Computer
An ordinary computer is fine
API key
Not needed

Try it

Using Claude Code, Cursor or another AI coding assistant? Paste the prompt and it will walk you through the setup.New to this?

Before you install

  • Only download from the official GitHub page. Copies with similar names exist for many popular projects.
  • License (Apache-2.0): Permissive: free to use, change and share, including for business.
  • More on staying safe

Where people are talking about it