FastMCP Python Framework
Python framework for exposing functions as MCP tools and connecting applications to MCP servers, with generated schemas and input/output validation.
About this listing
FastMCP helps Python developers build MCP servers and clients around ordinary application functions. It generates tool schemas, validates inputs and outputs, and handles protocol and connection lifecycle concerns so developers can concentrate on application logic.
Servers can expose tools, resources and prompts, while clients connect to local or remote MCP servers. This makes the framework useful for teams adding existing Python capabilities to agent workflows without implementing the MCP boundary themselves. A typical workflow is to define a Python function, register it as a tool, run a server and call that tool through a client.
The framework code is available under Apache License 2.0. Free refers to the code, not to external model APIs, hosting or infrastructure, which may incur separate charges. Documentation tracks the main development branch, so developers should check release compatibility before adopting newer features.