{"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":"2026-07-23T18:21:43.049Z","server":{"name":"io.github.Invaro/opentax","title":null,"description":"Verifiable US tax oracle for AI agents: cited, machine-checkable federal and state tax computation","version":"0.2.1","remote_url":"https://opentax.invaro.ai/mcp","repo_url":null},"operational_grade":{"grade":"A","score":90,"provisional":0,"reachable":1,"auth_state":"open","latency_ms":436,"tool_count":15,"probed_at":"2026-07-23T16:16:09.927Z","evidence":[{"criterion":"reachability","points":25,"max":25,"evidence":"HTTP 200, initialize accepted in 436ms"},{"criterion":"protocol","points":15,"max":15,"evidence":"valid JSON-RPC initialize result, protocolVersion 2025-06-18, serverInfo opentax@0.1.0"},{"criterion":"tooling","points":35,"max":35,"evidence":"tools/list OK: 15 tools e.g. \"calculate_tax\"; 15/15 described, 15/15 fully-typed schemas, median description 320 chars"},{"criterion":"latency","points":10,"max":10,"evidence":"initialize round-trip 436ms"},{"criterion":"provenance","points":5,"max":15,"evidence":"description present; no repository URL; version 0.2.1; namespace io.github.Invaro does NOT match remote host (expected *.invaro.github.io)"}],"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":"citation_quality","metric":"citation_capability_advertised","status":"unverified","value_text":null,"evidence":"Metadata/tool descriptions advertise citation or evidence capability: Verifiable US tax oracle for AI agents: cited, machine-checkable federal and state tax computation calculate_tax Compute US federal INDIVIDUAL income tax (or balance due if withholding is given) from a con | tent-addressed corpus of cited rules | own keys are rejected,  calculate_business_tax Compute US federal BUSINESS-ENTITY tax from the same cited corpus: check-the-box entity classification, Form 1120 corporate income tax (§ 179/168(k)/174A/163(j)/DRD/NOL, § 250, GBC/FTC/BEAT), S-corp entity taxes, corpo. No response-level citation benchmark has verified this claim yet.","source_type":"live_probe","sample_size":null,"observed_at":"2026-07-23T16:16:09.927Z","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":"2026-07-23T16:16:09.927Z","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."}