FastMCP is a high-level 📝Python framework for building 📝Model Context Protocol (MCP) servers. Created by Jeremiah Lowin, it provides a decorator-based 📝Application Programming Interface (API) that abstracts away the low-level 📝JSON-RPC transport, session management, and protocol boilerplate — letting developers define tools, resources, and prompts in a few lines of Python.
FastMCP became the de facto Python 📝SDK for MCP server development because it shipped a better developer experience than 📝Anthropic's official MCP Python package. At a 2026 MCP keynote, the protocol lead (who wrote the official SDK) acknowledged this directly: FastMCP is "just way better than the Python SDK we ship." The official Python SDK v2, currently in development, is being informed by FastMCP's design patterns.
With SDK v2 for both 📝TypeScript and Python announced for 2026, the gap may narrow, but FastMCP's head start in developer experience and its large install base mean it will likely remain the preferred choice for Python MCP servers.
If you're building an MCP server in Python, start with FastMCP. The official SDK is for when you need low-level protocol control or are building framework-level tooling. For everything else, FastMCP is the right call.