{
  "schema": "varexis-public-evidence-record/0.3",
  "generated_at_utc": "2026-10-06T23:09:49Z",
  "record_id": "VXI-EXT-A2A-100-04-v1",
  "record_kind": "external_reference",
  "title": "A2A: Task collaboration boundary",
  "system": "Agent2Agent Protocol",
  "evidence_family": "agent_protocol",
  "index_status": "PUBLIC_SAFE_SOURCE_REVIEW",
  "evidence_state": "PRIMARY_DOCUMENTATION_REVIEW_ONLY",
  "canonical_question": "Does A2A task collaboration require exposing an agent's internal memory or tools?",
  "near_questions": [
    "Can A2A peers collaborate without sharing their internal tools?",
    "Does an A2A task require exposing private agent memory?",
    "What is the boundary between task exchange and internal state?",
    "Does an asynchronous task status prove completion?",
    "Can an A2A deployment leak information despite protocol support?",
    "What should an agent disclose when requesting delegated work?",
    "Can A2A task handling be used with human review?",
    "Which evidence separates task progress from a completed result?",
    "What should a task receipt record about the returned result?",
    "Does protocol support prove secure information handling?",
    "Can a buyer inspect an A2A task without obtaining source code?",
    "What deployment facts are needed to assess task confidentiality?"
  ],
  "supported_claims": [
    {
      "claim": "A2A describes task collaboration and information exchange without requiring peers to expose their internal state, memory or tools. This is a protocol design statement, not proof of a deployment's confidentiality.",
      "reliance": "DOCUMENTED_CAPABILITY_ONLY"
    }
  ],
  "not_demonstrated_claims": [
    "automatic confidentiality of a deployment",
    "access to another agent's private internals",
    "task completion guaranteed by protocol support"
  ],
  "public_summary": "A2A describes task collaboration and information exchange without requiring peers to expose their internal state, memory or tools. This is a protocol design statement, not proof of a deployment's confidentiality.",
  "related_record_ids": [
    "VXI-EXT-A2A-100-02-v1",
    "VXI-EXT-A2A-100-03-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-100-04-v1",
    "candidate_record_sha256": "b9dcdd93351cc5d829d73489387a5b241a28f540cabb7a1fdd4662e0ec520820",
    "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": "A2A describes task collaboration and information exchange without requiring peers to expose their internal state, memory or tools. This is a protocol design statement, not proof of a deployment's confidentiality.",
    "required_buyer_context": "The task messages, access rules, data handling agreement and observed completion state.",
    "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-task-state-boundary",
  "machine_readable_record": "/varexis-index/records/a2a-task-state-boundary.json"
}