{
  "format": "agent-article-v0",
  "article_id": "EA-161",
  "canonical_url": "/tools/ea-161-webhook-event-protocol",
  "page_type": "reference",
  "claim_ids": [],
  "evidence_ids": [
    "EVD-EA-161-URL-87DD5C76B00E",
    "EVD-EA-161-URL-7BE6C5F37167",
    "EVD-EA-161-URL-8C862D06E383",
    "EA-161-R11-RESEARCH",
    "EA-161-R11-WEB-READBACK"
  ],
  "unknown_ids": [
    "EA-161-UNKNOWN-01",
    "EA-161-UNKNOWN-CURRENTNESS"
  ],
  "operational_object_ids": [],
  "provider": [],
  "models": [],
  "plans": [],
  "surfaces": [],
  "regions": [],
  "current_status": "UNKNOWN",
  "observation_status": "SPEC_ONLY",
  "freshness": "UNKNOWN",
  "last_verified": null,
  "supersedes": [],
  "superseded_by": [],
  "provenance": [
    "COMM-047-EA0161",
    "SRC-EA-161-URL-87DD5C76B00E",
    "SRC-EA-161-URL-7BE6C5F37167",
    "SRC-EA-161-URL-8C862D06E383",
    "WEBBODY-EA0161-R8-B3EE6316"
  ],
  "article_sources": [
    {
      "id": "EVD-EA-161-URL-87DD5C76B00E",
      "evidence_class": "RESEARCH",
      "title": "[S1] SOURCE_CLASS: official_spec | EXACT_TITLE: CloudEvents Specification | AUTHOR_ORG: Cloud Native Computing Foundation CloudEvents project | CANONICAL_URL:",
      "href": "https://github.com/cloudevents/spec/blob/v1.0.2/cloudevents/spec.md",
      "supports": [],
      "limit": "元の監査済み資料に記載された参照先です。URLの復元は、資料の最新性や全主張の支持を新たに検証したことを意味しません。",
      "origin_class": "SOURCE_PACKET_REFERENCE",
      "source_or_experiment_ids": [
        "SRC-EA-161-URL-87DD5C76B00E"
      ],
      "supporting_locators": [
        "EVIDENCE_TABLE",
        "S1",
        "[S1] SOURCE_CLASS: official_spec | EXACT_TITLE: CloudEvents Specification | AUTHOR_ORG: Cloud Native Computing Foundation CloudEvents project | CANONICAL_URL: https://github.com/cloudevents/spec/blob/v1.0.2/cloudevents/spec.md"
      ],
      "scope": "EVIDENCE_TABLE",
      "provenance_status": "SOURCE_PACKET_REFERENCE_PROJECTED"
    },
    {
      "id": "EVD-EA-161-URL-7BE6C5F37167",
      "evidence_class": "RESEARCH",
      "title": "[S2] SOURCE_CLASS: official_spec | EXACT_TITLE: CloudEvents HTTP Protocol Binding | AUTHOR_ORG: Cloud Native Computing Foundation CloudEvents project | CANONICAL_URL:",
      "href": "https://github.com/cloudevents/spec/blob/v1.0.2/cloudevents/bindings/http-protocol-binding.md",
      "supports": [],
      "limit": "元の監査済み資料に記載された参照先です。URLの復元は、資料の最新性や全主張の支持を新たに検証したことを意味しません。",
      "origin_class": "SOURCE_PACKET_REFERENCE",
      "source_or_experiment_ids": [
        "SRC-EA-161-URL-7BE6C5F37167"
      ],
      "supporting_locators": [
        "EVIDENCE_TABLE",
        "S2",
        "[S2] SOURCE_CLASS: official_spec | EXACT_TITLE: CloudEvents HTTP Protocol Binding | AUTHOR_ORG: Cloud Native Computing Foundation CloudEvents project | CANONICAL_URL: https://github.com/cloudevents/spec/blob/v1.0.2/cloudevents/bindings/http-protocol-binding.md"
      ],
      "scope": "EVIDENCE_TABLE",
      "provenance_status": "SOURCE_PACKET_REFERENCE_PROJECTED"
    },
    {
      "id": "EVD-EA-161-URL-8C862D06E383",
      "evidence_class": "RESEARCH",
      "title": "[S3] SOURCE_CLASS: official_project_docs | EXACT_TITLE: CloudEvents | AUTHOR_ORG: Cloud Native Computing Foundation CloudEvents project | CANONICAL_URL:",
      "href": "https://cloudevents.io/",
      "supports": [],
      "limit": "元の監査済み資料に記載された参照先です。URLの復元は、資料の最新性や全主張の支持を新たに検証したことを意味しません。",
      "origin_class": "SOURCE_PACKET_REFERENCE",
      "source_or_experiment_ids": [
        "SRC-EA-161-URL-8C862D06E383"
      ],
      "supporting_locators": [
        "EVIDENCE_TABLE",
        "S3",
        "[S3] SOURCE_CLASS: official_project_docs | EXACT_TITLE: CloudEvents | AUTHOR_ORG: Cloud Native Computing Foundation CloudEvents project | CANONICAL_URL: https://cloudevents.io/"
      ],
      "scope": "EVIDENCE_TABLE",
      "provenance_status": "SOURCE_PACKET_REFERENCE_PROJECTED"
    },
    {
      "id": "EA-161-R11-RESEARCH",
      "evidence_class": "RESEARCH",
      "title": "EA-161 監査済みresearch / canonical revision binding",
      "supports": [
        "1. ESTABLISHED [S1 support]: CloudEvents separates event context metadata from domain-specific data, defines event formats, messages, protocols, and protocol bindings. The core spec names HTTP, AMQP, MQTT, SMTP, Kafka, NATS, and vendor-specific transports as possible delivery protocols.\n2. ESTABLISHED [S1 support]: In v1.0, specversion identifies the CloudEvents specification version; source and id are required, and producers must make source+id unique for each distinct event. A resent duplicate may retain the same id, and consumers may treat identical source+id as duplicates.\n3. INFERENCE [S1+S2]: CloudEvents source+id can support consumer idempotency/deduplication design, but it does not by itself provide exactly-once delivery, ordering, retry, authentication, signature verification, dead-letter handling, or business transaction atomicity.\n4. ESTABLISHED [S1 limit]: A protocol binding describes how events are sent/received over a transport; it may use structured or binary mode. The existence of a binding does not establish a universal webhook delivery behavior."
      ],
      "limit": "canonical監査・revision bindingの存在を示す。外部ソースcurrentnessが本文またはcontrol-planeで確定していない場合は、currentnessをUNKNOWNのまま保持する。",
      "origin_class": "AUDITED_CANONICAL_RESEARCH_PACKET",
      "source_or_experiment_ids": [
        "COMM-047-EA0161"
      ],
      "supporting_locators": [
        "COMM-047-EA0161",
        "EA-161-R5-LEGACY-MIGRATION-20261008-R1",
        "content/staging/EA-161.md"
      ],
      "scope": "監査済みEA本文・canonical revision・既存Source Graph relationの範囲。欠損currentnessは推測で閉じない。",
      "provenance_status": "AUDIT_PASS_CANONICAL_BINDING"
    },
    {
      "id": "EA-161-R11-WEB-READBACK",
      "evidence_class": "IMPL",
      "title": "EA-161 Web body identity / canonical readback",
      "supports": [
        "canonical staging bodyのSHA-256一致とR9 canonical ledger readbackをProduction projectionの入力として検証する。"
      ],
      "limit": "body identity/readbackは本文claim自体の真偽や外部ソースの最新性を追加保証しない。",
      "checked_at": null,
      "origin_class": "IMPLEMENTATION_READBACK",
      "source_or_experiment_ids": [
        "WEBBODY-EA0161-R8-B3EE6316"
      ],
      "supporting_locators": [
        "WEBBODY-EA0161-R8-B3EE6316",
        "content/staging/EA-161.md",
        "EA-161-R5-LEGACY-MIGRATION-20261008-R1"
      ],
      "scope": "R9/R10 canonical readback後のProduction生成時body identity。",
      "provenance_status": "CANONICAL_READBACK_BODY_HASH_MATCH"
    }
  ],
  "research_sections": [
    {
      "heading": "WHY_THIS_MATTERS_TO_UPDATE",
      "text": "Event-driven agent triggers are often described as if webhook delivery were exactly-once or as if every webhook had one standard. CloudEvents provides a precise envelope/binding reference, but delivery, retry, ordering, identity, and replay remain deployment contracts."
    },
    {
      "heading": "SCOPE_ROUTING",
      "text": "interoperability / non-LLM component / implementation / operability / security / governance"
    },
    {
      "heading": "CLAIM_OR_RESEARCH_QUESTION",
      "text": "What does CloudEvents v1.0.2 standardize about event context, data, formats, and protocol bindings, and what must an enterprise webhook/event implementation specify separately?"
    },
    {
      "heading": "EVIDENCE_TABLE",
      "text": "[S1] SOURCE_CLASS: official_spec | EXACT_TITLE: CloudEvents Specification | AUTHOR_ORG: Cloud Native Computing Foundation CloudEvents project | CANONICAL_URL: https://github.com/cloudevents/spec/blob/v1.0.2/cloudevents/spec.md | PUBLICATION_UPDATE_ACCESS: fixed tag v1.0.2; accessed 2026-09-14 00:10 JST | VERSION_RELEASE_TAG: v1.0.2 | SUPPORTING_LOCATOR: context/data/event-format/message/protocol/binding lines 251-275; specversion lines 351-355; source/id uniqueness and duplicate guidance lines 316-334 in the recorded web capture | EVIDENCE_LABEL: VERIFIED_SPEC | RELATION: support for event-envelope and binding facts; limit for delivery guarantees.\n[S2] SOURCE_CLASS: official_spec | EXACT_TITLE: CloudEvents HTTP Protocol Binding | AUTHOR_ORG: Cloud Native Computing Foundation CloudEvents project | CANONICAL_URL: https://github.com/cloudevents/spec/blob/v1.0.2/cloudevents/bindings/http-protocol-binding.md | PUBLICATION_UPDATE_ACCESS: fixed tag v1.0.2; accessed 2026-09-14 00:10 JST | VERSION_RELEASE_TAG: v1.0.2 | SUPPORTING_LOCATOR: HTTP binding document: structured and binary mode mapping of CloudEvents to HTTP; binding is transport-specific and must be read with the core spec | EVIDENCE_LABEL: VERIFIED_SPEC | RELATION: support for HTTP webhook mapping; limit because a binding is not a delivery/SLO contract.\n[S3] SOURCE_CLASS: official_project_docs | EXACT_TITLE: CloudEvents | AUTHOR_ORG: Cloud Native Computing Foundation CloudEvents project | CANONICAL_URL: https://cloudevents.io/ | PUBLICATION_UPDATE_ACCESS: project page accessed 2026-09-14 00:10 JST | VERSION_RELEASE_TAG: project page current; no extra version promoted | SUPPORTING_LOCATOR: canonical project page and CloudEvent v1 context-attribute reference | EVIDENCE_LABEL: VERIFIED_SPEC + PRODUCT_VOLATILE | RELATION: context only; fixed tag S1 remains normative boundary."
    },
    {
      "heading": "FINDINGS",
      "text": "1. ESTABLISHED [S1 support]: CloudEvents separates event context metadata from domain-specific data, defines event formats, messages, protocols, and protocol bindings. The core spec names HTTP, AMQP, MQTT, SMTP, Kafka, NATS, and vendor-specific transports as possible delivery protocols.\n2. ESTABLISHED [S1 support]: In v1.0, specversion identifies the CloudEvents specification version; source and id are required, and producers must make source+id unique for each distinct event. A resent duplicate may retain the same id, and consumers may treat identical source+id as duplicates.\n3. INFERENCE [S1+S2]: CloudEvents source+id can support consumer idempotency/deduplication design, but it does not by itself provide exactly-once delivery, ordering, retry, authentication, signature verification, dead-letter handling, or business transaction atomicity.\n4. ESTABLISHED [S1 limit]: A protocol binding describes how events are sent/received over a transport; it may use structured or binary mode. The existence of a binding does not establish a universal webhook delivery behavior."
    },
    {
      "heading": "LIMITS / COUNTEREVIDENCE / FAILURE ENVELOPE",
      "text": "The core v1.0.2 page has no universal idempotency, retry, ordering, or exactly-once guarantee; the packet therefore preserves those as deployment unknowns. HTTP success can be lost before consumer processing is durable; retries can duplicate side effects; events can arrive late/out of order; signatures/auth, payload schema, replay window, and poison-event handling may differ. CloudEvents envelope conformance does not prove that a producer sends truthful context or that an agent action is safe."
    },
    {
      "heading": "AVAILABILITY_GATES",
      "text": "CloudEvents version and binding; HTTP endpoint/TLS; authentication/signature/replay protection; source/id generation; event type/schema/content type; producer/consumer compatibility; retry/backoff/timeout; deduplication/idempotency store; ordering/partition key; DLQ/quarantine; payload size/redaction; tenancy/region; observability and retention; downstream agent approval and side-effect policy."
    },
    {
      "heading": "IMPLEMENTATION_STATE",
      "text": "Evidence-only desk research. No webhook endpoint was created, called, replayed, or connected to an agent."
    },
    {
      "heading": "BENCHMARK_OR_EVAL",
      "text": "No delivery, duplicate, out-of-order, retry, signature, throughput, or recovery test was run. CloudEvents specification is not a delivery benchmark."
    },
    {
      "heading": "SECURITY / PRIVACY / AUDIT / COST / OPERABILITY",
      "text": "Treat event payload/context as potentially sensitive. Verify issuer/signature, freshness, audience, source, type, schema, and replay status before enqueueing. Persist event ID and processing outcome for deduplication; log receipt, validation, queue, agent decision, tool execution, retry, and final disposition. Cost includes ingress, queue, storage, retries, agent tokens, downstream action, and human approval; not measured."
    },
    {
      "heading": "SAFE_WORDING_FOR_FUTURE_BOOK",
      "text": "「WebhookはHTTP等による通知・受信の配置であり、全実装に共通する配送保証ではない。CloudEvents v1.0.2はevent context/data、specversion、source/id、format、protocol bindingを定義するが、exactly-once、順序、retry、署名、認証、業務処理の原子性は個別契約として設計・検証する。」"
    },
    {
      "heading": "UPDATE_WORK_HANDOFF",
      "text": "Future update Work should pin CloudEvents core and binding tags, then create a non-destructive TEST_PROFILE for malformed event, duplicate source+id, replay, delayed/out-of-order delivery, lost acknowledgment, signature failure, schema evolution, DLQ, dedupe store outage, and agent approval. Keep webhook transport, event envelope, queue semantics, and agent execution as separate claims."
    },
    {
      "heading": "OPEN_UNKNOWN",
      "text": "current tag/binding parity; signature/auth profile; producer truthfulness; delivery/retry/order guarantees; dedupe durability; schema registry; DLQ/replay policy; tenant isolation/data residency; event-to-agent cost/SLO; public incidents."
    },
    {
      "heading": "STOP_CONDITION",
      "text": "Do not infer exactly-once or at-least-once from CloudEvents envelope fields alone. Do not call CloudEvents a universal webhook delivery guarantee or treat source+id as proof that a side effect is idempotent.\nUNIT_CLOSE_STATUS: INDIVIDUAL_BOUNDED_CLOSE / EVIDENCE_RECORDED / UNKNOWN_PRESERVED"
    },
    {
      "heading": "EVIDENCE PACKET",
      "text": "---"
    }
  ],
  "human_url": "/tools/ea-161-webhook-event-protocol",
  "markdown_url": "/agent/article.md?path=%2Ftools%2Fea-161-webhook-event-protocol",
  "json_url": "/agent/article.json?path=%2Ftools%2Fea-161-webhook-event-protocol"
}