v4.22.7 v4.22.8
low risk
punkpeye/fastmcpOct 14, 2026 → Oct 14, 20260 days between releases
What's New
Corrects JSON-RPC error responses for malformed URIs and enhances OpenAPI media type recognition
New Features
- OpenAPI media type recognition now supports different casing or parameters
Improvements
- OpenAPI media type recognition now supports different casing or parameters
Bug Fixes
- Returns -32602 for malformed percent-escaped resource URIs
Upgrade Notes
No configuration changes required. The library now returns specific JSON-RPC error codes for malformed URIs or missing arguments. OpenAPI media type handling is now more flexible regarding casing and parameters.
The Two Releases
v4.22.7
v4.22.7
Oct 14, 2026· 8 days ago
Ensures client capabilities are properly detected and learned for stateful HTTP stream sessions.
Full release notesv4.22.8
v4.22.8
Oct 14, 2026· 8 days ago
Corrects JSON-RPC error responses for malformed URIs and missing arguments, and enhances OpenAPI media type recognition.
Full release notes