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Expose advertised MCP server capabilities in status responses - #44826
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copyberry[bot] merged 1 commit intoSep 11, 2026
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## What changed Add `serverCapabilities` to `mcpServerStatus/list` responses in both `full` and `toolsAndAuthOnly` modes, including thread-scoped reads. Return the initialized server's capabilities object, including its `extensions` map, or `null` when unavailable. Capture capabilities during initialization so they remain available when tool discovery fails. Clear them on each new connection attempt and keep them independent of shared tool caches. Update the protocol schemas, generated TypeScript and Python types, and documentation. ## Testing Add coverage for extension capabilities surviving tool-discovery failures in both detail modes. Extend existing tests to check advertised extensions, absent capabilities after initialization failure, and serialization of unavailable capabilities as `null`. GitOrigin-RevId: 8e9d67c10fac3a54e82bef8be5d99caaf82597d1
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Expose advertised MCP server capabilities in status responses
What changed
Add
serverCapabilitiestomcpServerStatus/listresponses in bothfullandtoolsAndAuthOnlymodes, including thread-scoped reads. Return the initialized server's capabilities object, including itsextensionsmap, ornullwhen unavailable.Capture capabilities during initialization so they remain available when tool discovery fails. Clear them on each new connection attempt and keep them independent of shared tool caches. Update the protocol schemas, generated TypeScript and Python types, and documentation.
Testing
Add coverage for extension capabilities surviving tool-discovery failures in both detail modes. Extend existing tests to check advertised extensions, absent capabilities after initialization failure, and serialization of unavailable capabilities as
null.