Check a tool before your agent depends on it.
Robin Saige probes every server in the MCP registry — 30,455 ○ listed, 15,472 ● reachable, checked weekly — and turns what it finds into one verdict: allow, warn, or block. Search for what you need, read the verdict, and open the evidence behind it.
…or paste a server name. Agents: point at robinsaige.com/mcp and call should_i_use(name) — same answer, no key. Try: weather · tariff · sanctions
✓ allow ! warn ✕ block — from four questions: does it answer · what is it · can it be checked · did it hold. Company kept is context, never sentence.
The registry, cut by the five questions
The registry lists 30,455 ○ servers and checks none of them. Watch the number fall as each question is asked — every bar opens the servers that survived that cut. The last bar is small on purpose: “verified true” is the hardest claim on this site, and attempts never inflate it.
as of 2026-09-06 · counts are doors
Of the 15,472 ● servers probed, 43% never answer a real handshake — read the full picture →
Five questions, asked in order
Verdicts that moved this week
On its own scoreboard.
Robin Saige is itself an MCP server, listed in the registry it measures
(com.robinsaige/verifier) — probed by its own prober, scored by its
own rules. A grader that won’t be graded isn’t one.
Every number carries its grade — ● observed: our probe recorded it · ◐ derived: computed from observations · ○ reported: the registry or operator says so. Every number is a door to its servers. 13 ● numbers corrected in public — two of them ours — and none deleted. How to read this site →