{"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":"2026-07-17T06:42:24.903Z","server":{"name":"io.github.AceDataCloud/mcp-producer","title":null,"description":"MCP server for Producer/Riffusion AI music generation","version":"2026.7.4.1","remote_url":"https://producer.mcp.acedata.cloud/mcp","repo_url":"https://github.com/AceDataCloud/ProducerMCP"},"operational_grade":{"grade":"C","score":62,"provisional":1,"reachable":1,"auth_state":"auth-wellbehaved","latency_ms":1181,"tool_count":null,"probed_at":"2026-07-16T08:16:20.009Z","evidence":[{"criterion":"reachability","points":18,"max":25,"evidence":"HTTP 401 in 1181ms — auth required; WWW-Authenticate present: \"Bearer error=\"invalid_token\", error_description=\"Authentication required\", resource_metadata=\"https://producer.mcp.aceda\""},{"criterion":"protocol","points":0,"max":15,"evidence":"handshake not reachable behind auth — unverified"},{"criterion":"tooling","points":0,"max":0,"evidence":"auth-gated — tooling unverifiable, excluded from score (grade marked provisional)"},{"criterion":"latency","points":7,"max":10,"evidence":"initialize round-trip 1181ms"},{"criterion":"provenance","points":15,"max":15,"evidence":"description present; repository linked; version 2026.7.4.1; namespace io.github.AceDataCloud matches endpoint/repo"}],"protocol_access":"auth-wellbehaved"},"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":"unaudited","observations":[],"response_benchmarks":[],"reviewed_field_reports":[],"interpretation":"Dimensions are independent; missing evidence is not a pass; field reports are qualitative, moderated and never votes."}