feat(core): Capture initialize attributes on MCP servers #18531
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… logic for initialize requests, and improving session data handling
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dcramer
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Dec 18, 2025
I shipped [a fix](getsentry/sentry-javascript#18531) to capture client name on stateless servers for `initialize` spans and it was released today. [Sentry SDK changelog](https://github.com/getsentry/sentry-javascript/releases/tag/10.32.0).
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With this PR we get this attributes from the initialization request and response into the
initializespan:mcp.client.name,mcp.client.version,mcp.client.title(from request)mcp.server.name,mcp.server.version,mcp.server.title(from response)mcp.protocol.version(from both request and response)Changes:
initializerequest and set them on the span after creation intransport.tsinitializeresponse incompleteSpanWithResultsand add them to the spanbuildClientAttributesFromInfoandbuildServerAttributesFromInfoto build attributes directly fromPartyInfoobjectsCloses #18532 (added automatically)