last deploy · 2026.08.04 · 1ac7153
Agent tool registries are argued about far more than they are measured. I publish open, citable baselines for the Model Context Protocol ecosystem: what tools claim, whether those claims hold, and whether the code behind them still exists. Every dataset below is CC-BY and built from the same pipeline that runs mcpindex.ai in production, so the numbers are operational exhaust rather than a one-off crawl.
Measures how many MCP tools declare the effects a policy gate would need, and whether those declarations stay bound to the contract actually observed. Ships a fixture generator and an aggregate verifier, so every number regenerates from the released files alone.
Publishes the longitudinal observation panel behind the drift measurement, so the result can be reproduced and extended rather than taken on faith.
A two-vantage census of the GitHub repositories behind registry-listed MCP servers: 1,830 of 13,105 repos (14.0%) were no longer publicly accessible as of 2026-07-20, affecting 2,069 listed servers that registries keep serving.
Aggregate and per-server records of safety-relevant contract changes across the reachable remote-server population: tools appearing, disappearing, and quietly changing their descriptions after publication.
Contributor. Authored Pattern 8 on tool-contract capture and drift verification for agentic and MCP integrations; the drift and source-liveness datasets are cited in the current draft.