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@jlowin announced a new MCP spec and released FastMCP v4 beta on 2026-03-11 (post…

2026-07-28 · 21:32 UTC ·@jlowin ·0 min read

Brief

FastMCP (announced by @jlowin on 2026-03-11) released a new MCP specification alongside a FastMCP v4 beta that’s been completely rebuilt on the v2 Python SDK. The v4 beta aims to expose the new Model Context Protocol capabilities while preserving FastMCP’s familiar API, with installation and docs hosted at gofastmcp.com/getting-starte….

Why it matters

@jlowin announced a new MCP spec and released FastMCP v4 beta on 2026-03-11 (post created 2026-03-11 12:44).

Key details

  • FastMCP v4 is rebuilt on top of the v2 Python SDK, promising the new Model Context Protocol features with FastMCP’s existing interface and workflow.
  • Download and docs are linked at gofastmcp.com/getting-starte… (project site: gofastmcp.com) for servers, clients, and interactive app development.
Source evidence

It's MCPster today, and the new spec is out... along with the FastMCP v4 beta!

FastMCP v4 is totally rebuilt on top of the v2 Python SDK, which means you get all the fun of the new protocol with the same old FastMCP form you know and love.

Try it now!

gofastmcp.com/getting-starte…

Link

FastMCP: The Framework for MCP - FastMCP

FastMCP is the standard framework for building Model Context Protocol (MCP) servers, clients, and interactive applications.
gofastmcp.com