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v4.22.5

punkpeye/fastmcpv4.22.5Oct 14, 2026by github-actions[bot]

Upgrading?

What changed from v4.22.4 → v4.22.5?What's new in v4.22.6 after v4.22.5?

AI Summary

Enhances prompt argument validation, OpenAPI path handling, and configuration precedence.

Key Highlights

  • Enforces required prompt arguments named like Object.prototype properties.
  • Rejects OpenAPI path parameters that resolve to dot segments.
  • Supports prototype property names in argument completions.
  • Respects explicit stateless configuration precedence.

Full Release Notes

## [4.22.5](https://github.com/punkpeye/fastmcp/compare/v4.22.4...v4.22.5) (2026-10-14)


### Bug Fixes

* enforce a required prompt argument named like an Object.prototype property ([#427](https://github.com/punkpeye/fastmcp/issues/427)) ([a2ddf3c](https://github.com/punkpeye/fastmcp/commit/a2ddf3c4b4797271cad35600ff278359ff031d59))
* **openapi:** recognize JSON response media types case-insensitively ([#425](https://github.com/punkpeye/fastmcp/issues/425)) ([cbd43e2](https://github.com/punkpeye/fastmcp/commit/cbd43e29d42eb57e70648fc53ddaf2469880ec5f))
* **openapi:** reject path parameters that resolve to a dot segment ([#419](https://github.com/punkpeye/fastmcp/issues/419)) ([6f622af](https://github.com/punkpeye/fastmcp/commit/6f622aff9eea7570bf85a2531100f4bc016866fc))
* respect explicit stateless configuration precedence ([#432](https://github.com/punkpeye/fastmcp/issues/432)) ([5bcc5ad](https://github.com/punkpeye/fastmcp/commit/5bcc5add9824811167d93e145b87c6183ae701ab))
* support prototype property names in argument completions ([#426](https://github.com/punkpeye/fastmcp/issues/426)) ([ec42e13](https://github.com/punkpeye/fastmcp/commit/ec42e13cf3a8bf972fc2288ed1eb4a65b6518ef8))

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