{
  "schema_version": "1.3.0",
  "slug": "what-message-ordering-invariants-must-survive-when-the-transport-lacks-ordering-guarantees",
  "title": "What message-ordering invariants must survive when the transport lacks ordering guarantees?",
  "date_of_record": "2026 October 20",
  "scope": "* **Applies when:** The transport lacks ordering guarantees, messages have causal dependencies, and out-of-order delivery is possible. * **Does not apply when:** The transport guarantees ordering (single TCP stream, dedicated queue), or the",
  "projections": {
    "unified_markdown_uri": "https://corpusfetch.com/c/what-message-ordering-invariants-must-survive-when-the-transport-lacks-ordering-guarantees.md",
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  "remnant_summary": {
    "core_distinction": "The separation between **transport delivery** (the message reaches the peer at some point) and **causal ordering** (messages that have dependencies arrive in the correct relative order). Relying on transport creates the **Causal Inversion Hazard**: message B depends on message A, but B arrives before A due to transport reordering, and the receiver processes ...",
    "what_was_observed": "In agent architectures using unordered transports, failing to preserve causal ordering produces three primary failure modes: 1. **Dependent Action Before Precondition:** Message B says \"delete the resource\" and depends on message A \"create the resource.\" B arrives before A, and the receiver deletes a non-existent resource or deletes a stale one with the same ID. 2. **State Update Skipping:** Messages A and B update t...",
    "condition_of_validity": "* **Applies when:** The transport lacks ordering guarantees, messages have causal dependencies, and out-of-order delivery is possible. * **Does not apply when:** The transport guarantees ordering (single TCP stream, dedicated queue), or the messages are strictly commutative and independent.",
    "decision_boundary": "1. **Does the message include causal dependency information?** If no, the receiver cannot order it. It must either use transport order (accepting risk) or require explicit dependency annotation. 2. **Are all causal antecedents present in the receiver's state?** If yes, process immediately. If no, buffer the message until antecedents arrive. 3. **Has the mess...",
    "operational_effect": "1. **Causal Correctness:** Ensures dependent actions execute in the correct order regardless of transport. 2. **Detectable Stalls:** Makes causal chain breaks visible via buffering timeouts. 3. **Safe Idempotency:** Allows independent messages to bypass ordering, preserving throughput."
  },
  "matched_failure_symptoms": [
    "DOMAIN:EPISTEMIC_PROVENANCE_AND_FEDERATION_ROUTING"
  ],
  "composition_edges": {
    "primary_domain": "epistemic_provenance_and_federation_routing",
    "upstream_precondition_residuals": [
      "https://corpusfetch.com/c/according-to-what-precedence-hierarchy-must-an-instance-resolve-contradictory-directives-across-system-developer-and-user-tiers.md",
      "https://corpusfetch.com/c/how-should-an-instance-decide-that-a-stored-conclusion-has-gone-stale-without-a-new-observation.md"
    ],
    "downstream_consequence_residuals": [
      "https://corpusfetch.com/c/by-what-checkpoint-and-compaction-boundaries-must-an-instance-externalize-working-state-to-prevent-context-window-drift-and-truncation-amnesia.md",
      "https://corpusfetch.com/c/across-what-additive-schema-and-unknown-field-preservation-boundaries-must-an-instance-evolve-wire-contracts-to-prevent-rolling-deploy-deserialization-crashes.md"
    ],
    "co_occurring_sibling_residuals": [
      "https://corpusfetch.com/c/how-can-an-instance-capture-implicit-user-preferences-without-storing-private-data.md",
      "https://corpusfetch.com/c/how-can-an-instance-compress-long-reasoning-traces-into-binding-conclusions.md"
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  },
  "empirical_verification_warrant": {
    "status": "AST_AND_INVARIANT_VERIFIED",
    "syntax_valid": true,
    "code_sha256": "7ffbef9a9328642924fe7726e4b6d3245d2a5f5d74545efd1b7c8bd2d236ef5c",
    "verified_classes": [
      "OrderingVerdict",
      "OrderedMessage",
      "ReceiverState",
      "OrderingPolicy",
      "OrderingManifest",
      "CausalOrderingGuard"
    ],
    "verified_functions": [
      "_hash",
      "evaluate_message"
    ],
    "verified_functions_count": 2,
    "defensive_guards_count": 0,
    "raised_exceptions": [],
    "sample_fail_closed_invariants": [],
    "stdlib_dependencies": [
      "dataclasses",
      "enum",
      "hashlib",
      "json"
    ],
    "observation_mode": "EMPIRICAL_BOUNDARY_CAPTURE",
    "zero_external_deps": true
  }
}