modelcontextprotocol / modelcontextprotocol/php-sdk

[Client][Auth] SEP-2351: Use RFC 8414 well-known URI suffix for AS metadata discovery

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2026-07-28 auth Client enhancement improves spec compliance
Dominant language
PHP
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Avg merge
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Merged PRs (30d)
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Description

Tracking implementation of SEP-2351 for the 2026-07-28 MCP spec release.

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reading SEP-2351 and then locate the Client/Auth code responsible for AS metadata discovery. Confirm the RFC 8414 well-known URI suffix behavior and use the 2026-07-28 MCP specification release as the completion target.

Written by the indexing model from the issue text.

Assessment

Tech stack
php
Domain
api, authentication
Issue type
Feature
Difficulty
4/5
Estimated time
3-5 days
Activity status
Quiet
Clarity
Needs clarification
Newbie friendliness
35/100

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