improvement(mcp): per-server tool queries + negative cache #4715

Bugbot Review

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Final Result: Bugbot completed review - no new issues found! ✅

Request ID: serverGenReqId_4b63b682-e10c-4c50-8796-1af956f14a2c

✅ Bugbot reviewed your changes and found no new issues!

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^{Reviewed by Cursor Bugbot for commit ed1b970. Configure here.}