We scan a rotating set of popular MCP servers every week with a real JSON-RPC handshake — not a ping. Here's what the current data says. All numbers below are live from this week's index.
That's the correct posture for anything touching private data (Notion, Linear, Sentry, Stripe, GitHub all sit behind OAuth). But it means the openly-introspectable surface — the servers agents can discover and try anonymously — is much smaller than the raw registry counts suggest.
Every publicly-introspectable server we rank tops out at the same score, docked the same points for the same reason: they answer initialize without authentication. For a public docs/knowledge server that's a deliberate, reasonable choice — but it's the one thing separating them from a perfect score, and it's identical across the board.
Agents chain many calls, so handshake latency compounds. The spread between the fastest and slowest public server is large — a real, measurable quality difference that never shows up in a registry listing.
Across the servers that pass conformance, the thing that varies most is tool description coverage — and it's the single strongest predictor of whether agents actually call a server's tools. See why your tools aren't being called.
initialize + tools/list handshake via MCP Pulse. Auth-gated servers can't be introspected anonymously and are excluded from scored rankings but counted in the totals. Data refreshes weekly; cite it freely with a link.Real handshake, conformance score, latency — free, 10 seconds.
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