Anonymous test of 78 MCP servers: only 51% can complete the full call flow
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On October 6, 2026, DEV Community published Pennyforge’s anonymous health probe of the public MCP registry. The author took 186 endpoints from the a–b slice of the registry; 78 of them responded to initialize. An anonymous health probe of those 78 servers showed that only 40 (51.3%) could get through the full flow of initialize → tools/list → one safe tools/call. The report attributed the usability gap to authentication and version compatibility issues. Note that earlier coverage used “78 MCP servers” as the sample size, and later coverage clarified that the 78 were only the subset of the 186 endpoints that responded to initialize, with a full-call success rate of 51.3%.
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- DEV Community · MCPSelectedAnonymous health checks on 78 registry MCP servers: 51.3% complete the full call sequence
Pennyforge ran anonymous health checks on the 78 servers that responded to initialize out of 186 endpoints in the a–b slice of a public MCP registry. Only 40 of them (51.3%) made it through the full flow of initialize → tools/list → one safe tools/call.
Interest in this story
Current interest 7·Peak within comparable coverage 9（Oct 6, 15:00）·Change over 24 hours within comparable coverage –
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