Every remote server in the official MCP registry, probed live and graded with receipts — the only MCP index where every grade shows its evidence.
14 matches. Categories are keyword-derived from registry metadata — imperfect by design, deterministic by principle.
| # | Server | Grade | Score | Tools |
|---|---|---|---|---|
| 1 | ai.backengine/backengine-mcp | C prov. | 66 | — |
| 2 | ai.waystation/gmail | C prov. | 66 | — |
| 3 | ai.calfeed/calfeed Calfeed |
C prov. | 62 | — |
| 4 | ai.fathom.api/mcp | C prov. | 62 | — |
| 5 | ai.tuteliq/mcp | C prov. | 62 | — |
| 6 | ai.openhelm/email-outreach | D prov. | 57 | — |
| 7 | ai.primeta/primeta Primeta |
D prov. | 57 | — |
| 8 | ai.radiusos.www/crm RadiusOS CRM |
D prov. | 49 | — |
| 9 | ai.smithery/arjunkmrm-ahoy | F | 15 | — |
| 10 | ai.smithery/Danushkumar-V-mcp-discord | F | 15 | — |
| 11 | ai.smithery/faithk7-gmail-mcp | F | 15 | — |
| 12 | ai.smithery/samihalawa-whatsapp-go-mcp | F | 15 | — |
| 13 | ai.smithery/smithery-ai-slack | F | 15 | — |
| 14 | ai.smithery/sachicali-discordmcp-suite | F | 12 | — |
Each server is probed live over streamable HTTP: reachability (25) — does initialize succeed; auth-gated servers earn partial credit only if they advertise WWW-Authenticate so clients can discover OAuth. protocol (15) — valid JSON-RPC handshake; deprecated SSE transport is penalized. tooling (35) — tools/list works, share of tools with descriptions and fully-typed input schemas, median description depth. latency (10) — initialize round-trip. provenance (15) — registry metadata completeness and whether the reverse-DNS namespace actually matches the serving domain. Scores scale to what is verifiable; unverifiable dimensions mark the grade provisional rather than guessing. Every point carries the verbatim observation that earned it. No stars, no votes, no pay-to-rank — probes only.