{
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  "generated_at_utc": "2026-10-24T18:06:09.388Z",
  "record_id": "VXI-EXT-PROCUREMENT-MCP-TOOL-LIST-CHANGE-SUBSCRIPTION-BOUNDARY-01-v1",
  "record_kind": "external_reference",
  "title": "MCP tool-change notification coverage",
  "system": "Model Context Protocol",
  "evidence_family": "vendor_evidence_review",
  "index_status": "PUBLIC_SAFE_SOURCE_REVIEW",
  "evidence_state": "PRIMARY_DOCUMENTATION_REVIEW_ONLY",
  "canonical_question": "Does absence of an MCP tools/list_changed notification prove a cached tool schema is unchanged?",
  "near_questions": [
    "Does every MCP client automatically receive tool-list changes?",
    "What subscription enables toolsListChanged in MCP 2026-07-28?",
    "Can notification silence validate a cached input schema?",
    "What evidence supports freshness of MCP tool discovery?"
  ],
  "supported_claims": [
    {
      "claim": "In the reviewed 2026-07-28 tools specification, servers advertising listChanged should notify clients whose subscriptions/listen stream requests toolsListChanged. This is a SHOULD requirement tied to capability and subscription context. Silence alone is not a verified immutable tool inventory or schema.",
      "reliance": "DOCUMENTED_CAPABILITY_ONLY"
    }
  ],
  "not_demonstrated_claims": [
    "Live drift detection supplied by current INDEX",
    "Actual server changes, missed notifications and cache freshness are unknown.",
    "Buyer deployment testing, live runtime enforcement, certification or permission to act",
    "Expanded capabilities or licences for existing INDEX executables"
  ],
  "public_summary": "In the reviewed 2026-07-28 tools specification, servers advertising listChanged should notify clients whose subscriptions/listen stream requests toolsListChanged. This is a SHOULD requirement tied to capability and subscription context. Silence alone is not a verified immutable tool inventory or schema.",
  "related_record_ids": [],
  "source_review": {
    "source_type": "official_external_documentation",
    "source_title": "Tools - Model Context Protocol",
    "source_url": "https://modelcontextprotocol.io/specification/2026-07-28/server/tools",
    "checked_on": "2026-10-24",
    "candidate_record_id": "VXI-EXT-PROCUREMENT-MCP-TOOL-LIST-CHANGE-SUBSCRIPTION-BOUNDARY-01-v1",
    "candidate_record_sha256": "2a3b1c21448154429825fbdd23480c0b33fcbf9672b23e729211e257b532ff47",
    "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": "In the reviewed 2026-07-28 tools specification, servers advertising listChanged should notify clients whose subscriptions/listen stream requests toolsListChanged. This is a SHOULD requirement tied to capability and subscription context. Silence alone is not a verified immutable tool inventory or schema.",
    "required_buyer_context": "Pinned protocol edition and tool description; Server listChanged capability; Subscription state and refreshed inventory. Buyer deployment not 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": "2026-10-24",
    "claim_to_check": "Does absence of an MCP tools/list_changed notification prove a cached tool schema is unchanged?",
    "documented_statement": {
      "status": "documented",
      "statement": "In the reviewed 2026-07-28 tools specification, servers advertising listChanged should notify clients whose subscriptions/listen stream requests toolsListChanged. This is a SHOULD requirement tied to capability and subscription context. Silence alone is not a verified immutable tool inventory or schema.",
      "source_ids": [
        "mcp-tools"
      ]
    },
    "review_inference": {
      "status": "review_inference",
      "statement": "Recheck the authorized tool description when freshness matters and record the capability and subscription evidence.",
      "source_ids": [
        "mcp-tools"
      ]
    },
    "buyer_evidence_required": [
      "Pinned protocol edition and tool description",
      "Server listChanged capability",
      "Subscription state and refreshed inventory"
    ],
    "review_condition": {
      "status": "varexis_review_policy",
      "statement": "Do not approve unchanged schema solely from notification silence."
    },
    "unknowns": "Actual server changes, missed notifications and cache freshness are unknown.",
    "unknown_finding": {
      "status": "unknown",
      "statement": "Actual server changes, missed notifications and cache freshness are unknown."
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    "evidence_sources": [
      {
        "source_id": "mcp-tools",
        "url": "https://modelcontextprotocol.io/specification/2026-07-28/server/tools",
        "final_url": "https://modelcontextprotocol.io/specification/2026-07-28/server/tools",
        "status": 200,
        "captured_at_utc": "2026-10-24T17:45:36.462Z",
        "sha256": "6f48067956d274128d700dbfb6cec9bbda642804fb25b1e59e86e20cda7298fb",
        "bytes": 825561,
        "title": "Tools - Model Context Protocol",
        "hash_basis": "Decoded HTTP response body bytes",
        "rights_review": "Factual paraphrase and source metadata only; raw source retained privately and not redistributed.",
        "checked_on": "2026-10-24",
        "capture_status": 200,
        "claim_review_completed": true,
        "reviewed_sections": [
          "List Changed Notification",
          "listChanged capability",
          "subscriptions/listen toolsListChanged"
        ],
        "version_context": "MCP 2026-07-28 pinned edition; per-request version compatibility and subscription-specific notifications must not be applied to legacy editions."
      }
    ],
    "observed_deployment": false,
    "commercial_reliance_boundary": "Documentation review only; the buyer must establish applicability and actual outcomes. INDEX does not inspect or control the deployment.",
    "paid_value": {
      "decision_context": "Avoid executing against an unverified stale tool definition.",
      "free": "Complete review, sources, practical questions 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": "Recheck the documented behavior, product version and buyer evidence before relying on a current outcome."
    },
    "buyer_relevance": "Avoid executing against an unverified stale tool definition.",
    "refusal_conditions": [
      "Do not approve unchanged schema solely from notification silence."
    ]
  },
  "niche": {
    "niche_id": "agent-authority-action-evidence",
    "label": "Agent Authority & Action Evidence",
    "classification_id": "governance",
    "classification_label": "Agent Governance & Policy Boundaries",
    "topic_id": "governance",
    "buyer_intent": "Avoid executing against an unverified stale tool definition.",
    "comparison_role": "supplementary_discovery"
  },
  "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.",
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    "request_workflow": "/varexis-index/request-workflow.json",
    "service_id": "single_request",
    "service_routes_url": "/varexis-index/service-routes.json",
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    "operational_status": "AUTOMATIC_SERVICE_CAPABILITIES_GATED",
    "checkout_url": "/index-access"
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  "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#mcp-tool-list-change-subscription-boundary",
  "machine_readable_record": "/varexis-index/records/mcp-tool-list-change-subscription-boundary.json"
}