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FastMCP 3.0 is out! I don't even know how to fit it in a post... 🔌 Build servers from directories, APIs, remote servers — anything 🎭 Per-session context & progressive disclosure 🖥️ Full CLI: list, call, generate clients 🔐 Versioning, granular auth, OTEL ⚡️ DX galore

Jeremiah Lowin

@jlowin.dev

Most of the work went into rearchitecting the framework to be production-ready for where MCP is going in 2026. But if we did our job right, you shouldn't be able to tell. You'll just notice everything works *better*. www.jlowin.dev/blog/fastmcp...

jlowin.devFastMCP 3.0 is GAThree at last

19/2/26, 12:20 am0 reposts0 likes

Jeremiah Lowin

@jlowin.dev

19 Feb

You already know this was our biggest release ever, but during its month-long beta, FastMCP 3 attracted 21 first-time contributors and over 100K opt-in installs. The paint is still wet on the overhauled docs and upgrade guides (just ask your LLM!) gofastmcp.com/getting-star...

gofastmcp.comUpgrading from FastMCP 2 - FastMCPMigration instructions for upgrading between FastMCP versions

Jeremiah Lowin

@jlowin.dev

19 Feb

FastMCP is downloaded over a million times a day. We regret that some of you are about to be surprised by an unexpected upgrade. If it causes any issue, we're sorry. The upgrade guides will help, and if something's broken, please open an issue: github.com/prefecthq/fa...

github.comGitHub - PrefectHQ/fastmcp: 🚀 The fast, Pythonic way to build MCP servers and clients.🚀 The fast, Pythonic way to build MCP servers and clients. - PrefectHQ/fastmcp

Jeremiah Lowin

@jlowin.dev

19 Feb

Lastly, we're already working on FastMCP 3.1 with a new take on MCP Apps. I think it might be a bigger deal than 3.0.