{
  "schema": "varexis-public-evidence-record/0.3",
  "generated_at_utc": "2026-10-06T23:09:49Z",
  "record_id": "VXI-EXT-A2A-100-02-v1",
  "record_kind": "external_reference",
  "title": "A2A: Agent interoperability",
  "system": "Agent2Agent Protocol",
  "evidence_family": "agent_protocol",
  "index_status": "PUBLIC_SAFE_SOURCE_REVIEW",
  "evidence_state": "PRIMARY_DOCUMENTATION_REVIEW_ONLY",
  "canonical_question": "What does A2A establish about communication between independent agents?",
  "near_questions": [
    "How can independent agents exchange work through A2A?",
    "Does A2A guarantee that two vendor agents work together?",
    "Which protocol helps agents communicate across frameworks?",
    "What evidence is needed for an A2A compatibility claim?",
    "Can a protocol specification replace integration testing?",
    "How should an agent describe A2A interoperability scope?",
    "Does choosing A2A authorise cross-agent delegation?",
    "What must a buyer supply for a scoped A2A review?",
    "Can two A2A deployments support different capabilities?",
    "Does published A2A support establish a working connection?",
    "What should an A2A interoperability receipt capture?",
    "agent protocol interoperability"
  ],
  "supported_claims": [
    {
      "claim": "The A2A specification defines a shared interaction model for independent agent systems. A particular pair of deployments still needs compatibility checks.",
      "reliance": "DOCUMENTED_CAPABILITY_ONLY"
    }
  ],
  "not_demonstrated_claims": [
    "universal interoperability",
    "tested compatibility of a named deployment",
    "permission to delegate or spend"
  ],
  "public_summary": "The A2A specification defines a shared interaction model for independent agent systems. A particular pair of deployments still needs compatibility checks.",
  "related_record_ids": [
    "VXI-EXT-A2A-100-03-v1",
    "VXI-EXT-A2A-100-04-v1"
  ],
  "source_review": {
    "source_type": "official_external_documentation",
    "source_title": "A2A Protocol current specification",
    "source_url": "https://a2a-protocol.org/latest/specification/",
    "checked_on": "2026-10-07",
    "candidate_record_id": "VXI-EXT-A2A-100-02-v1",
    "candidate_record_sha256": "0b07beb584b32fb0dcbe686f32b9971a87069fd7869e0536a6812cbfa6e9f6e8",
    "method": "Primary documentation reviewed for the published bounded statement.",
    "deployment_tested_by_varexis": false,
    "revalidation": "Recheck the primary source, version and deployment context before paid delivery."
  },
  "answer_policy": {
    "classification": "DOCUMENTED_WITH_DEPLOYMENT_BOUNDARY",
    "bounded_answer": "The A2A specification defines a shared interaction model for independent agent systems. A particular pair of deployments still needs compatibility checks.",
    "required_buyer_context": "Protocol versions, supported interfaces, declared capabilities and the concrete interaction.",
    "missing_evidence": "A broader claim needs evidence matching the intended use. Payment does not upgrade the evidence state."
  },
  "private_boundary": "Raw logs, thresholds, private paths, source code, protected mechanisms and reconstruction-level details are excluded from public and paid delivery.",
  "paid_access_note": "The public answer and boundaries are free. Pay first, then email a concrete question for asynchronous manual review, receipt or scoped export. No fixed turnaround or automatic API access is promised.",
  "service_route": {
    "request_guide": "/varexis-index/request.html",
    "request_workflow": "/varexis-index/request-workflow.json",
    "service_id": "evidence_receipt",
    "service_routes_url": "/varexis-index/service-routes.json",
    "payment_required": true,
    "accepting_paid_requests": true,
    "operational_status": "PAID_ASYNC_MANUAL_FULFILMENT",
    "checkout_url": "https://buy.stripe.com/28EaEXaPe7bBdGLgXSdwc05"
  },
  "authority_boundary": "VAREXIS-INDEX informs evidence reliance. It does not provide advice, certification, deployment authority, security assurance, production approval, or guarantee.",
  "human_page": "/varexis-index/catalog.html#a2a-agent-interoperability",
  "machine_readable_record": "/varexis-index/records/a2a-agent-interoperability.json"
}