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Feat: Add RFC 7523 (JWT Bearer Grant) support #875

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@ZachGerman ZachGerman commented Aug 14, 2025

Adds support for JWT Credentials passed to the OAuthClientProvider.
Also added a JWT OAuth client in the examples directory.

Motivation and Context

This provides support for machine-to-machine auth.

How Has This Been Tested?

Tested E2E via Auth0.

Breaking Changes

  • Now requiring codeVerifier for token exchange, but I'm pretty sure it's desirable behavior since PKCE is required per MCP spec.

Types of changes

  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to change)
  • Documentation update

Checklist

  • I have read the MCP Documentation
  • My code follows the repository's style guidelines
  • New and existing tests pass locally
  • I have added appropriate error handling
  • I have added or updated documentation as needed

Additional context

Draft until tested end-to-end. Tested E2E via Auth0.
Bloated jwt-utils, as I was oiriginally going to add it to the built-in AS, but did a 180. Leaving it as-is in case someone wants to add built-in AS support for JWT.

@ZachGerman ZachGerman force-pushed the RFC-7523-support branch 4 times, most recently from 7092743 to 1094286 Compare August 19, 2025 04:58
@ZachGerman ZachGerman marked this pull request as ready for review August 19, 2025 05:04
@ZachGerman ZachGerman requested review from a team as code owners August 19, 2025 05:04
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