v4.13.0

Automattic/harperv4.13.0Aug 7, 2026by github-actions[bot]

AI Summary

This release adds a new authentication configuration option to enforce S256 code challenges.

Key Highlights

Added `allowPlainPkce` configuration to require S256 code challenges.

New Features

Auth: Added allowPlainPkce to require S256 code challenges.

Full Release Notes

# [4.13.0](https://github.com/punkpeye/fastmcp/compare/v4.12.8...v4.13.0) (2026-08-07)


### Features

* **auth:** add allowPlainPkce to require S256 code challenges ([fe382cb](https://github.com/punkpeye/fastmcp/commit/fe382cbed6a40398e7e91a7aedc63341f29addd0))