{"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":"2026-07-17T03:47:36.340Z","server":{"name":"io.github.xyzzylabs/tc39-mcp","title":"tc39-mcp","description":"Independent MCP server for the TC39 specs (ECMA-262 + ECMA-402): clauses, search, diffs, history.","version":"0.6.1","remote_url":"https://mcp.xyzzylabs.ai/tc39/mcp","repo_url":"https://github.com/xyzzylabs/tc39-mcp"},"operational_grade":{"grade":"A","score":100,"provisional":0,"reachable":1,"auth_state":"open","latency_ms":91,"tool_count":17,"probed_at":"2026-07-14T23:45:34.801Z","evidence":[{"criterion":"reachability","points":25,"max":25,"evidence":"HTTP 200, initialize accepted in 91ms"},{"criterion":"protocol","points":15,"max":15,"evidence":"valid JSON-RPC initialize result, protocolVersion 2024-11-05, serverInfo tc39-mcp@0.6.1"},{"criterion":"tooling","points":35,"max":35,"evidence":"tools/list OK: 17 tools e.g. \"spec.about\"; 17/17 described, 17/17 fully-typed schemas, median description 234 chars"},{"criterion":"latency","points":10,"max":10,"evidence":"initialize round-trip 91ms"},{"criterion":"provenance","points":15,"max":15,"evidence":"description present; repository linked; version 0.6.1; namespace io.github.xyzzylabs 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":"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."}