Endpoints the MCP registry declares that failed the initialize handshake on 2026-09-10. No tool was ever called. A server answering 401 is alive and is not listed here.
441 records across 212 subjects, observed 2026-09-10. Every one carries a check you can run in a single request.
All subjects ยท the whole registry, machine-readable
This is not a list of good APIs or bad ones. It is a list of observations, each dated and each disprovable in one request. Absence from it means an operation was not examined, not that it is fine.