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v4.23.3

punkpeye/fastmcpv4.23.3Oct 20, 2026by github-actions[bot]

Upgrading?

What changed from v4.23.2 → v4.23.3?What's new in v4.23.4 after v4.23.3?

AI Summary

This update resolves several critical bugs in the OpenAPI and Edge modules to enhance tool compatibility and security. It improves how resources are loaded, handles mixed-case HTTP URL schemes, and ensures security-sensitive fields are preserved during tool generation.

Key Highlights

  • Preserved declared mimeType for Edge resources when loading returns an object
  • Recognized mixed-case HTTP URL schemes in OpenAPI
  • Preserved __proto__ fields through generated tools to prevent security risks
  • Handled GET requests with object parameters correctly as tools

Full Release Notes

## [4.23.3](https://github.com/punkpeye/fastmcp/compare/v4.23.2...v4.23.3) (2026-10-20)


### Bug Fixes

* **edge:** keep a resource's declared mimeType when load returns an object ([#446](https://github.com/punkpeye/fastmcp/issues/446)) ([fe9f91a](https://github.com/punkpeye/fastmcp/commit/fe9f91a085c1c361f9295ab4d88e921f0a8519f7))
* **openapi:** ignore inherited mcpNames overrides ([#447](https://github.com/punkpeye/fastmcp/issues/447)) ([4b8d2a0](https://github.com/punkpeye/fastmcp/commit/4b8d2a0a4099fb5e92d4fa6cb9582eba06da778d))
* **openapi:** keep GETs with object parameters as tools ([#444](https://github.com/punkpeye/fastmcp/issues/444)) ([6f6f89a](https://github.com/punkpeye/fastmcp/commit/6f6f89ab25852812436156a6e41d3a3f9c382403))
* **openapi:** preserve __proto__ fields through generated tools ([#450](https://github.com/punkpeye/fastmcp/issues/450)) ([cf6f981](https://github.com/punkpeye/fastmcp/commit/cf6f981305e4f8c11c0a3e1d1401bcdcb1530587))
* **openapi:** recognize mixed-case HTTP URL schemes ([#449](https://github.com/punkpeye/fastmcp/issues/449)) ([ad208db](https://github.com/punkpeye/fastmcp/commit/ad208db72933e4431adecabf9e658235afd38135))

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