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OSS2026-04-21 · source-backed
PrefectHQ/fastmcp shipped Prefab UI (beta), MultiAuth, PropelAuth support, and Google GenAI sampling. Over 1M daily downloads. If you're building MCP servers, this is the de facto framework.
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v4.0.0b5, released August 28, introduces ClientGroup: one managed client per server, each negotiating independently, with collision-checked tool namespacing and call routing. That replaces fronting several servers with a proxy that forces one negotiated version across all of t...
Released August 31 after five betas, five weeks, 23 contributors and 80+ PRs, built on the MCP 2026-07-28 revision and the rewritten Python SDK v2 (GitHub). Modern requests are sessionless and self-contained, so protocol version is negotiated per connection and horizontal scal...
The Model Context Protocol's 2026-07-28 revision is the biggest change since the protocol existed. The core is now stateless request/response instead of a bidirectional stateful session. Authorization aligns with OAuth 2.1 and OpenID Connect. MCP Apps and Tasks moved under a v...
FastMCP v4.0.1 (September 2) makes ClientGroup reference-count its context like Client does, so entering a connected group from a nested block reuses connections instead of raising (release). LangChain's 1.4.0a4, cut hours later, contains commits adding _ReentrantClientGroup,...
The 1.4.0a2 alpha ships langchain.mcp, an MCPAdapter turning any MCP server into tools you hand straight to create_agent. Connection handling is FastMCP's rather than a reimplementation, so a URL, a local stdio script, an in-process FastMCP server, a multi-server config, or a...
PR #3426, merged September 2, backports session lifecycle ownership: session_idle_timeout existed on StreamableHTTPSessionManager but defaulted to None and couldn't be set from FastMCP, so at stock settings a session whose client never sent DELETE stayed registered until proce...
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