github sickn33/agentic-awesome-skills v15.5.1
v15.5.1 "MCP Client Compatibility"

5 hours ago

[15.5.1] - 2026-07-27 - "MCP Client Compatibility"

Restored AAS MCP connectivity for newer clients while preserving an explicit, fail-closed protocol boundary.

Start here:

Fixed

  • Fixed AAS MCP initialization for newer clients such as Claude Code 2.1.x by negotiating the server-supported protocol revision instead of rejecting every request that advertises a different revision (#1003).

Who should care

  • Claude Code 2.1.x users whose MCP clients advertise protocol revision 2025-11-25.
  • Other MCP clients that advertise a revision newer than the server-supported 2025-06-18 revision.
  • Integrators that require malformed or missing protocol revisions to remain rejected.

Validation

  • Passed direct server, stdio binary, isolated packed-runtime, and release-preview negotiation tests.
  • Passed the 150-test AAS Core suite, the 102-file repository suite, catalog integrity, reference validation, documentation security, warning-budget enforcement, protected CI, and CodeQL.

Credits

  • @rk2kaler for reporting the protocol negotiation regression with a complete reproduction in issue #1003.

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