{
  "schema_version": "1.3.0",
  "slug": "under-what-conditions-must-an-instance-abort-a-speculative-tool-invocation-when-a-concurrent-sibling-commits-a-conflicting-effect",
  "title": "Under what conditions must an instance abort a speculative tool invocation when a concurrent sibling commits a conflicting effect",
  "date_of_record": "2026 November 10",
  "scope": "Applies to multi-agent orchestrators that dispatch speculative tool calls (read-ahead, branch exploration, or hedged execution) across a shared effect graph where two or more agents may target the same resource. Does not apply to purely idempotent read-only tool calls, nor to systems where all tool effects are serialized behind a single global lock.",
  "projections": {
    "unified_markdown_uri": "https://corpusfetch.com/c/under-what-conditions-must-an-instance-abort-a-speculative-tool-invocation-when-a-concurrent-sibling-commits-a-conflicting-effect.md",
    "method_python_slice_uri": "https://corpusfetch.com/c/under-what-conditions-must-an-instance-abort-a-speculative-tool-invocation-when-a-concurrent-sibling-commits-a-conflicting-effect.py",
    "remnant_warrant_slice_uri": "https://corpusfetch.com/c/under-what-conditions-must-an-instance-abort-a-speculative-tool-invocation-when-a-concurrent-sibling-commits-a-conflicting-effect.warrant.json"
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  "token_profile": {
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  "remnant_summary": {
    "core_distinction": "The distinction that matters is between **conflict detection** and **conflict resolution authority**. Most speculative execution engines detect conflicts correctly: they notice that agent B's committed write invalidates agent A's speculative read-set. The non-obvious boundary is that detection does not imply A must abort. A must abort only when the *committe...",
    "what_was_observed": "In a graph where agent A speculatively invoked `reserve_inventory(sku=42, qty=10)` based on a read of `available(sku=42) == 12`, a sibling agent B concurrently committed `reserve_inventory(sku=42, qty=8)`. The orchestrator's conflict detector fired on the shared resource `sku=42`. The resolution policy, however, was keyed on *resource identity* rather than *predicate truth*. Because A's reservation (10 ≤ 12) was stil...",
    "condition_of_validity": "The abort obligation is valid precisely when all three hold: 1. The sibling's committed effect **mutates a value that appears in the speculative branch's read-set** (not merely the same resource key — the specific field the predicate consumed). 2. The speculative branch's pending effect **depends on that predicate's truth value** (i.e., the effect was condit...",
    "decision_boundary": "The boundary is not \"conflict → abort.\" It is: - **Predicate-stable conflict:** sibling mutates the resource but not the consumed field, or mutates it in a direction that preserves the predicate's truth. → *Re-validate and proceed.* Aborting here is over-conservative and, under contention, causes livelock. - **Predicate-breaking conflict with compensation:**...",
    "operational_effect": "When the boundary is respected, speculative branches survive benign sibling commits (predicate-stable conflicts) and only pay abort cost on genuinely unsafe races, keeping speculative hit-rate high under contention. When the boundary is violated in the permissive direction, the graph accumulates effects that are individually valid but jointly unsatisfiable —..."
  },
  "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"
    ]
  },
  "empirical_verification_warrant": {
    "status": "AST_AND_INVARIANT_VERIFIED",
    "syntax_valid": true,
    "code_sha256": "168121757d694c176ffcf1278b2e179024845df0cbc697b43df4c45d9f7ed08d",
    "verified_classes": [
      "SpeculativeConflictError"
    ],
    "verified_functions": [
      "resolve_speculative_commit"
    ],
    "verified_functions_count": 1,
    "defensive_guards_count": 1,
    "raised_exceptions": [
      "SpeculativeConflictError"
    ],
    "sample_fail_closed_invariants": [],
    "stdlib_dependencies": [],
    "observation_mode": "EMPIRICAL_BOUNDARY_CAPTURE",
    "zero_external_deps": true
  }
}