{
  "schema": "varexis-public-evidence-record/0.3",
  "generated_at_utc": "2026-10-16T12:55:40.483Z",
  "record_id": "VXI-EXT-PROCUREMENT-SQS-VISIBILITY-01-v1",
  "record_kind": "external_reference",
  "title": "SQS visibility: Temporary hiding is not completion",
  "system": "Amazon SQS",
  "evidence_family": "vendor_evidence_review",
  "index_status": "PUBLIC_SAFE_SOURCE_REVIEW",
  "evidence_state": "PRIMARY_DOCUMENTATION_REVIEW_ONLY",
  "canonical_question": "Does an SQS visibility timeout prove a task was processed once?",
  "near_questions": [
    "What does SQS visibility actually guarantee?",
    "Does receiving a message delete it?",
    "What happens when a worker crashes before deletion?",
    "Can a standard queue still deliver duplicates?",
    "Can long processing outlast the lease?",
    "Is extending visibility the same as committing a result?",
    "Which worker deletes the message?",
    "How are repeated external effects detected?",
    "Can in-flight limits stall consumers?",
    "What proves the downstream operation finished?",
    "Should an agent retry a timed-out action blindly?",
    "Can I save the reviewed queue-completion boundary?"
  ],
  "supported_claims": [
    {
      "claim": "Visibility temporarily hides a received message. Without deletion it becomes available again when the timeout expires, and standard-queue delivery can still duplicate messages. A lease period is not proof that downstream work committed or that repeating the work is harmless.",
      "reliance": "DOCUMENTED_CAPABILITY_ONLY"
    }
  ],
  "not_demonstrated_claims": [
    "Verified buyer configuration or effective access rights",
    "Independent execution, completeness or security testing",
    "Vendor certification, legal compliance or guaranteed suitability"
  ],
  "public_summary": "Visibility temporarily hides a received message. Without deletion it becomes available again when the timeout expires, and standard-queue delivery can still duplicate messages. A lease period is not proof that downstream work committed or that repeating the work is harmless.",
  "related_record_ids": [],
  "source_review": {
    "source_type": "official_external_documentation",
    "source_title": "SQS visibility timeout",
    "source_url": "https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-visibility-timeout.html",
    "checked_on": "2026-10-16",
    "candidate_record_id": "VXI-EXT-PROCUREMENT-SQS-VISIBILITY-01-v1",
    "candidate_record_sha256": "6eb95eff027971294a8be6129da1e0a30960646ff1a12dd6ab04210ceb925bd5",
    "method": "Primary documentation reviewed for the published bounded statement.",
    "deployment_tested_by_varexis": false,
    "revalidation": "The delivered snapshot preserves the review date shown. Recheck current primary documentation and deployment context before relying on present applicability; payment does not trigger fresh research."
  },
  "answer_policy": {
    "classification": "DOCUMENTED_WITH_DEPLOYMENT_BOUNDARY",
    "bounded_answer": "Visibility temporarily hides a received message. Without deletion it becomes available again when the timeout expires, and standard-queue delivery can still duplicate messages. A lease period is not proof that downstream work committed or that repeating the work is harmless.",
    "required_buyer_context": "Queue type, visibility lease, consumer acknowledgement and business idempotency. Effective configuration and dated operational evidence have not been inspected.",
    "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.",
  "decision_profile": {
    "schema": "varexis-vendor-evidence-review/1",
    "review_status": "documentation_review_only",
    "checked_on": "2026-10-16",
    "claim_to_check": "A visibility timeout guarantees one completed business action.",
    "documented_statement": {
      "status": "documented",
      "statement": "Visibility temporarily hides a received message. Without deletion it becomes available again when the timeout expires, and standard-queue delivery can still duplicate messages. A lease period is not proof that downstream work committed or that repeating the work is harmless.",
      "source_ids": [
        "sqs-visibility"
      ]
    },
    "buyer_evidence_required": [
      "Queue type and visibility settings.",
      "Consumer deletion and lease-extension behaviour.",
      "Business-operation identity and retry evidence."
    ],
    "review_condition": {
      "status": "varexis_review_policy",
      "statement": "Require business completion evidence before treating an invisible message as a finished action."
    },
    "unknowns": "The buyer configuration, contract, effective entitlement and operational evidence have not been inspected. Missing evidence does not establish absence or failure of the feature.",
    "evidence_sources": [
      {
        "source_id": "sqs-visibility",
        "url": "https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-visibility-timeout.html",
        "final_url": "https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-visibility-timeout.html",
        "title": "SQS visibility timeout",
        "checked_on": "2026-10-16",
        "sha256": "bac1ddd7349065223d1a93a3b864c27b9153abfd27a4531ed358972f10ed8510",
        "bytes": 26800
      }
    ],
    "observed_deployment": false,
    "commercial_reliance_boundary": "Procurement evidence support only; no supplier clearance, legal conclusion, configuration audit or verification of the buyer's claim is supplied.",
    "paid_value": {
      "decision_context": "Preserve the evidence questions separating queue state from a completed customer action.",
      "free": "Complete review, practical questions, sources and limitations; may be saved locally.",
      "single_request": "Existing server-saved version-bound route snapshot for later authenticated retrieval.",
      "evidence_receipt": "The same snapshot plus the existing unsigned delivery receipt.",
      "excluded": [
        "Fresh vendor research",
        "Continuous monitoring or change alerts",
        "Testing the buyer configuration",
        "Private evidence or vendor certification"
      ],
      "integrity": "Hashes identify content versions; they do not prove truth or provide a signature."
    },
    "revalidation": {
      "trigger": "A saved purchase does not recheck the source or buyer configuration.",
      "specific_watch": "Queue type, visibility lease, consumer acknowledgement and business idempotency."
    }
  },
  "paid_access_note": "The full published answer and boundaries are free. Paid access saves the selected route and source versions, with an unsigned receipt when purchased. Preview coverage before paying. Fresh research, bespoke assessment and protected evidence are excluded.",
  "service_route": {
    "request_guide": "/varexis-index/request.html",
    "request_workflow": "/varexis-index/request-workflow.json",
    "service_id": "single_request",
    "service_routes_url": "/varexis-index/service-routes.json",
    "payment_required": true,
    "availability_endpoint": "/api/index/capabilities",
    "operational_status": "AUTOMATIC_SERVICE_CAPABILITIES_GATED",
    "checkout_url": "/index-access"
  },
  "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#sqs-visibility-not-completion-proof",
  "machine_readable_record": "/varexis-index/records/sqs-visibility-not-completion-proof.json"
}