Failure PatternDecision layer

The MCP Census Verdict Drift Trap: Why Agencies Fail With MCP Census in Client Agent Delivery

Symptom: Client .mcp.json audits return UNKNOWN for servers the agency already approved last month, and nobody can say what changed between runs. Root cause: Census returns four verdicts (PASS, REVIEW, BLOCK, UNKNOWN) and agencies treat only BLOCK as actionable, leaving REVIEW and UNKNOWN as silent pass-throughs in delivery.

By InnovaAI ResearchPublished

AI Infrastructure
How do you recognize it?
  • •Client .mcp.json audits return UNKNOWN for servers the agency already approved last month, and nobody can say what changed between runs
  • •A CI job wired to the /v1/audit endpoint starts failing on exit codes after a server's npm package is republished, blocking deploys mid-sprint
  • •Anonymous lookups hit the 10 unique lookups/day per IP ceiling during a multi-server client audit, so the last entries in the config never get checked
  • •REVIEW verdicts pile up in the risk report with no owner, and the client signs off on servers that were never actually cleared
  • •Credit burn spikes on the free plan's 1,000 credits each UTC month because the team re-audits whole configs instead of pulling the change feed via cursor
Why does it happen?
  • •Census returns four verdicts (PASS, REVIEW, BLOCK, UNKNOWN) and agencies treat only BLOCK as actionable, leaving REVIEW and UNKNOWN as silent pass-throughs in delivery
  • •Verdicts are grounded in public evidence across registry, GitHub, npm, and PyPI, so a republished package or moved repo shifts the result without any change on the client side, and teams audit once at kickoff instead of subscribing webhooks to watch specific servers
  • •The free tier grants 1,000 credits each UTC month with no grant rollover, and anonymous access is capped at 10 unique lookups/day per IP, so audits run without an API key or without a credit budget stall partway through a config
  • •MCP Census is a first gate, not a malware scanner or pen-test tool, so agencies that sell it to clients as full agent security coverage create expectations the verdict set cannot meet
How do you fix it?
  • •Generate an API key and move every audit call off anonymous access, then set a per-client credit ceiling against the $19 builder tier's 2,000 credits each UTC month before the next config sweep
  • •Add the one-line Census rule to CLAUDE.md, AGENTS.md, or .cursor/rules so agents stamp servers at install time rather than at kickoff, and route the /v1/audit call through GitHub Actions as a preflight gate
  • •Subscribe webhooks to watch every server that returned REVIEW or UNKNOWN, and assign each verdict a named owner with a resolution date in the client risk report
  • •Pull the change feed via cursor on a fixed weekly cadence per client stack, and re-run only the entries that shifted instead of re-auditing the full .mcp.json
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