{"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":"2026-09-20T03:10:19.720Z","server":{"name":"io.github.cyanheads/crossref-mcp-server","title":null,"description":"Resolve DOIs, search ~155M scholarly works, and fetch references via the Crossref REST API.","version":"0.3.13","remote_url":"https://crossref.caseyjhand.com/mcp","repo_url":"https://github.com/cyanheads/crossref-mcp-server"},"operational_grade":{"grade":"A","score":97,"provisional":0,"reachable":1,"auth_state":"open","latency_ms":842,"tool_count":7,"probed_at":"2026-09-19T23:15:54.939Z","evidence":[{"criterion":"reachability","points":25,"max":25,"evidence":"HTTP 200, initialize accepted in 842ms"},{"criterion":"protocol","points":15,"max":15,"evidence":"valid JSON-RPC initialize result, protocolVersion 2025-06-18, serverInfo crossref-mcp-server@0.3.13"},{"criterion":"tooling","points":35,"max":35,"evidence":"tools/list OK: 7 tools e.g. \"crossref_get_work\"; 7/7 described, 7/7 fully-typed schemas, median description 782 chars"},{"criterion":"latency","points":7,"max":10,"evidence":"initialize round-trip 842ms"},{"criterion":"provenance","points":15,"max":15,"evidence":"description present; repository linked; version 0.3.13; namespace io.github.cyanheads 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":"claim_verification","metric":"advertised_corpus_scale","status":"unverified","value_text":"155M records","evidence":"Advertised corpus-size expression(s) found in public metadata/tool descriptions: 155M records. Black-box discovery does not establish corpus coverage; a manifest or sampled benchmark is required.","source_type":"live_probe","sample_size":null,"observed_at":"2026-09-19T23:15:54.939Z","methodology_version":"trust-v1"},{"dimension":"citation_quality","metric":"citation_capability_advertised","status":"unverified","value_text":null,"evidence":"Metadata/tool descriptions advertise citation or evidence capability: Resolve DOIs, search ~155M scholarly works, and fetch references via the Crossref REST API | crossref_get_work Resolves a DOI to its full Crossref metadata record: title, authors, affiliations, abstract (when deposited), journal or container, publication date, type, license, full-text | Outgoing references are reported as a count in referencesCount; the reference entries themselves come from crossref_get_references. No response-level citation benchmark has verified this claim yet.","source_type":"live_probe","sample_size":null,"observed_at":"2026-09-19T23:15:54.939Z","methodology_version":"trust-v1"},{"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":"2026-09-19T23:15:54.939Z","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."}