{"attribution":"MCP Queen — the evidence layer for MCP (https://mcpqueen.com)","license":"CC BY 4.0 — free to use with attribution and a link to mcpqueen.com","methodology":"https://mcpqueen.com/registry#methodology","docs":"https://mcpqueen.com/api","generated_at":"2026-10-10T01:34:57.198Z","server":{"name":"app.shelfclub/books","title":"Shelfclub","description":"Search a catalog of 1.7 million books and find books by mood, vibe, pace or genre. Read-only.","version":"0.2.0","remote_url":"https://mcp.shelfclub.app/mcp","repo_url":null},"operational_grade":{"grade":"A","score":97,"provisional":0,"reachable":1,"auth_state":"open","latency_ms":259,"tool_count":6,"probed_at":"2026-10-09T21:45:52.744Z","evidence":[{"criterion":"reachability","points":25,"max":25,"evidence":"HTTP 200, initialize accepted in 259ms"},{"criterion":"protocol","points":15,"max":15,"evidence":"valid JSON-RPC initialize result, protocolVersion 2025-06-18, serverInfo shelfclub@0.2.0"},{"criterion":"tooling","points":35,"max":35,"evidence":"tools/list OK: 6 tools e.g. \"search_books\"; 6/6 described, 6/6 fully-typed schemas, median description 374 chars"},{"criterion":"latency","points":10,"max":10,"evidence":"initialize round-trip 259ms"},{"criterion":"provenance","points":12,"max":15,"evidence":"description present; no repository URL; version 0.2.0; namespace app.shelfclub matches endpoint/repo"}],"protocol_access":"open"},"field_semantics":{"auth_state":"Deprecated name retained for compatibility. It means protocol handshake/discovery access only, not tool-level data entitlement.","protocol_access":"Preferred name for auth_state."},"audit_state":"observations_published","observations":[{"dimension":"security","metric":"authentication_boundary","status":"observed","value_text":"open","evidence":"Live protocol probe observed auth_state=open. This describes discovery/access behavior; it is not by itself a vulnerability finding.","source_type":"live_probe","sample_size":null,"observed_at":"2026-10-09T21:45:52.744Z","methodology_version":"trust-v1"}],"response_benchmarks":[],"reviewed_field_reports":[],"interpretation":"Dimensions are independent; missing evidence is not a pass; field reports are qualitative, moderated and never votes."}