{"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":"2026-10-14T10:08:35.726Z","server":{"name":"ai.arcreport/mcp","title":"ARC: agent checkout reachability","description":"Free, no sign-in MCP: can AI agents reach checkout at a store? Try: Use ARC to check allbirds.com","version":"2.2.0","remote_url":"https://www.arcreport.ai/api/mcp","repo_url":"https://github.com/abab7575/arc-mcp"},"operational_grade":{"grade":"A","score":94,"provisional":0,"reachable":1,"auth_state":"open","latency_ms":682,"tool_count":19,"probed_at":"2026-10-13T04:31:12.647Z","evidence":[{"criterion":"reachability","points":25,"max":25,"evidence":"HTTP 200, initialize accepted in 682ms"},{"criterion":"protocol","points":15,"max":15,"evidence":"valid JSON-RPC initialize result, protocolVersion 2025-06-18, serverInfo ARC@2.1.0"},{"criterion":"tooling","points":35,"max":35,"evidence":"tools/list OK: 19 tools e.g. \"check_store\"; 19/19 described, 19/19 fully-typed schemas, median description 191 chars"},{"criterion":"latency","points":7,"max":10,"evidence":"initialize round-trip 682ms"},{"criterion":"provenance","points":12,"max":15,"evidence":"description present; no repository URL; version 2.1.0; namespace ai.arcreport 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":"2026-10-13T04:31:12.647Z","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."}