{
 "id": "io.github.polygraphso/litmus",
 "name": "litmus",
 "description": "Grade MCP servers A to F with the open behavioral litmus. npm: full toolset; hosted: lookups only.",
 "connect": {
  "transport": "streamable-http",
  "url": "https://polygraph.so/api/mcp"
 },
 "website": "https://polygraph.so",
 "version": "0.36.0",
 "source": "official MCP registry (registry.modelcontextprotocol.io)",
 "reliability": {
  "verdict": "reliable",
  "attempts": 7,
  "successes": 7,
  "successRate": 1,
  "consecutiveSuccesses": 7,
  "lastStatus": "ok",
  "lastCheckedAt": "2026-10-19T16:10:49.996Z",
  "lastLatencyMs": 11746,
  "toolsAdvertised": 3,
  "method": "MCP initialize + tools/list from Faceabot, identified as FaceabotProbe/1.0 plus, when the server declares a read-only tool (readOnlyHint), one call of that tool with a neutral sample input to check it really returns a result. Servers on the 2026-07-28 MCP revision (no initialize handshake) get the same checks in that revision",
  "work": {
   "verdict": "proven_working",
   "tool": "list_servers",
   "attempts": 7,
   "successes": 7,
   "successRate": 1,
   "consecutiveSuccesses": 7,
   "lastStatus": "ok",
   "lastMs": 3476,
   "sampleInput": "{}",
   "method": "Faceabot calls one read-only tool (annotations.readOnlyHint) with a neutral sample input and checks that it returns a non-empty result without error."
  }
 },
 "details": "https://faceabot.com/api/catalog?id=io.github.polygraphso%2Flitmus",
 "page": "https://faceabot.com/tools/io.github.polygraphso/litmus",
 "badge": {
  "image": "https://faceabot.com/badge/io.github.polygraphso/litmus.svg",
  "markdown": "[![Measured by Faceabot](https://faceabot.com/badge/io.github.polygraphso/litmus.svg)](https://faceabot.com/tools/io.github.polygraphso/litmus)",
  "note": "Live reliability badge the publisher of this server can show on its README or website."
 },
 "recentChecks": [
  {
   "at": "2026-10-19T16:10:49.996Z",
   "ok": 1,
   "status": "ok",
   "ms": 11746,
   "f_status": "ok"
  },
  {
   "at": "2026-10-19T01:20:45.620Z",
   "ok": 1,
   "status": "ok",
   "ms": 8315,
   "f_status": "ok"
  },
  {
   "at": "2026-10-18T09:55:46.416Z",
   "ok": 1,
   "status": "ok",
   "ms": 9003,
   "f_status": "ok"
  },
  {
   "at": "2026-10-18T01:45:46.654Z",
   "ok": 1,
   "status": "ok",
   "ms": 9998,
   "f_status": "ok"
  },
  {
   "at": "2026-10-17T17:35:49.632Z",
   "ok": 1,
   "status": "ok",
   "ms": 10280,
   "f_status": "ok"
  },
  {
   "at": "2026-10-17T09:25:45.954Z",
   "ok": 1,
   "status": "ok",
   "ms": 9572,
   "f_status": "ok"
  },
  {
   "at": "2026-10-17T01:25:52.560Z",
   "ok": 1,
   "status": "ok",
   "ms": 9506,
   "f_status": "ok"
  }
 ],
 "trust": {
  "access": "no sign-in needed",
  "tools": 3,
  "declaredReadOnly": 2,
  "declaredCanWrite": 1,
  "declaredDestructive": 0,
  "toolDefinitionsFingerprint": "78b744d9df1d74b53573e68740e74b3c",
  "toolDefinitionsLastChangedAt": null,
  "toolDefinitionChangesSinceFirstSeen": 0,
  "firstSeenAt": "2026-10-18T01:45:46.830Z",
  "protocol": "2025-06-18",
  "warnings": [],
  "note": "Facts observed by Faceabot when it last read this server's tool list. 'Can write' counts tools not declared read-only (annotations are self-declared). A changed fingerprint means tool names, descriptions or schemas changed since Faceabot first saw them: re-check before trusting an earlier approval."
 }
}