{"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":"2026-09-10T02:43:56.330Z","server":{"name":"bot.mailbox/mailbox","title":null,"description":"Physical mail API for AI agents. Send letters, certified mail. Sandbox + live keys via MCP.","version":"1.0.1","remote_url":"https://mailbox.bot/api/mcp","repo_url":null},"operational_grade":{"grade":"A","score":97,"provisional":0,"reachable":1,"auth_state":"open","latency_ms":236,"tool_count":19,"probed_at":"2026-09-05T20:45:32.945Z","evidence":[{"criterion":"reachability","points":25,"max":25,"evidence":"HTTP 200, initialize accepted in 236ms"},{"criterion":"protocol","points":15,"max":15,"evidence":"valid JSON-RPC initialize result, protocolVersion 2025-11-25, serverInfo mailbox.bot@1.0.1"},{"criterion":"tooling","points":35,"max":35,"evidence":"tools/list OK: 19 tools e.g. \"get_mailbox\"; 19/19 described, 19/19 fully-typed schemas, median description 268 chars"},{"criterion":"latency","points":10,"max":10,"evidence":"initialize round-trip 236ms"},{"criterion":"provenance","points":12,"max":15,"evidence":"description present; no repository URL; version 1.0.1; namespace bot.mailbox 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":"2026-09-05T20:45:32.945Z","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."}