FastMCP 4 beta 5 introduces ClientGroup — one managed client per server, each negotiating its own protocol era independently, with collision-checked tool namespacing and call routing and no proxy in the middle. It also aligns middleware response limits with output schemas.
What's Changed
Enhancements ✨
- Remove obsolete Docket memory-server reset fixtures by @TyceHerrman in #4912
- add independent client groups by @zzstoatzz in #4904
Fixes 🐞
- fix(ci): satisfy latest ty control-flow checks by @zzstoatzz in #4928
- fix(middleware): align response limits with output schemas by @zzstoatzz in #4931
Docs 📚
- docs: fix beta 4 changelog MDX by @zzstoatzz in #4916
- docs: prepare FastMCP 4 beta 5 by @zzstoatzz in #4934
New Contributors
- @TyceHerrman made their first contribution in #4912
Full Changelog: v4.0.0b4...v4.0.0b5