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@ineersa ineersa commented Oct 23, 2025

Added ability to set custom protocol version.
This enables usage of clients which doesn't support newest MCP version and will allow to change schema version in future.

Motivation and Context

image Jetbrains AI Assistant uses oldest `2024-11-05` for example.

Some clients doesn't support newest version but work perfectly fine with 90%+ of SDK functionality.
This allows us at least for now use of those clients, at least while Schema Versioning won't be resolved.

How Has This Been Tested?

Unit test.
Jetbrains AI Assistant
image

Breaking Changes

No breaking changes

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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