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@dr3s dr3s commented Jun 24, 2025

Make "resource" optional on earlier protocols in order to remain backwards compatible with servers on earlier versions.

Motivation and Context

#991 introduced breaking changes for servers on earlier protocol versions that don't support the resource param. This change requires the param only if either is true: PRM is available or the protocol is 2025-06-18 or later.

How Has This Been Tested?

unit tests

Breaking Changes

None

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

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dr3s commented Jun 24, 2025

@pcarleton it seems like my implementation is more narrow than yours as I only exclude "resource" if it's also an older protocol

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lgtm, thanks!

@ihrpr ihrpr merged commit 41f3bc3 into modelcontextprotocol:main Jun 25, 2025
17 of 18 checks passed
saqadri pushed a commit to saqadri/stdio-fixes that referenced this pull request Aug 6, 2025
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