{
  "schema_version": "1.3.0",
  "slug": "why-does-an-instance-admit-a-tool-call-that-no-single-federation-policy-permits-cross-org-federation-policy-negotiation-for-data-residency-and-tool-al",
  "title": "Why does an instance admit a tool call that no single federation policy permits? — Cross-Org Federation Policy Negotiation for Data Residency and Tool Allowlists",
  "date_of_record": "2026 November 11",
  "scope": "Applies to federated agent runtimes where two or more organizations negotiate a joint capability envelope (tool allowlist ∩, residency region ∪-with-constraint) per request or per session. Does not apply to single-tenant deployments where one policy authority governs all tool invocations, nor to stateless proxies that do not materialize a negotiated envelope.",
  "projections": {
    "unified_markdown_uri": "https://corpusfetch.com/c/why-does-an-instance-admit-a-tool-call-that-no-single-federation-policy-permits-cross-org-federation-policy-negotiation-for-data-residency-and-tool-al.md",
    "method_python_slice_uri": "https://corpusfetch.com/c/why-does-an-instance-admit-a-tool-call-that-no-single-federation-policy-permits-cross-org-federation-policy-negotiation-for-data-residency-and-tool-al.py",
    "remnant_warrant_slice_uri": "https://corpusfetch.com/c/why-does-an-instance-admit-a-tool-call-that-no-single-federation-policy-permits-cross-org-federation-policy-negotiation-for-data-residency-and-tool-al.warrant.json"
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  "token_profile": {
    "full_markdown_tokens": 1703,
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  "remnant_summary": {
    "core_distinction": "The failure is not \"policy was misconfigured.\" It is a distinction between **envelope intersection** and **envelope composition under a shared principal**. When federation negotiation intersects two allowlists, the resulting set is a *capability* set, not an *authority* set. A tool call is admitted if it lies in the intersection. The invariant that operators...",
    "what_was_observed": "During a joint incident on 2026-11-09, a federated agent under Org A's principal executed `tool:search` with a request body routed to `us-east-1`. Org A's policy manifest declared `search → residency: eu-west` with `delegation: forbidden`. Org B's manifest declared `search → residency: us-east, eu-west` with `delegation: allowed-to-A`. The negotiator produced a merged envelope: - `tools: {search, translate}` - `resid...",
    "condition_of_validity": "The invariant \"admitted ⇒ permitted by at least one full policy\" holds only when one of the following is true: 1. **Single-authority residency.** All parties agree on a single residency region for every tool in the intersection. Then union = intersection and the composition is sound. 2. **Tag-preserving intersection.** The negotiator intersects not just tool...",
    "decision_boundary": "The operational decision is: **do you intersect tuples or compose sets?** - If you intersect tuples (`(tool, region, principal)`), you get soundness at the cost of *empty envelopes* whenever parties' region maps disagree—federation frequently fails closed to \"no tools,\" which operators experience as a broken integration. - If you compose sets (intersect tool...",
    "operational_effect": "The observable effect is a class of admitted calls that are individually auditable but jointly impermissible. Detection requires cross-org log joining on `request_id` and reconstruction of the `(tool, region, principal)` triple against *both* manifests—a check that neither party performs alone because each party's slice looks valid. The blast radius is bound..."
  },
  "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": "ed794f508a8b72f3e614a1ef0ecd170ff40789a7f30e6676862d9d1ee84e0ead",
    "verified_classes": [
      "FederationEnvelopeError",
      "Manifest"
    ],
    "verified_functions": [
      "negotiate",
      "admit"
    ],
    "verified_functions_count": 2,
    "defensive_guards_count": 3,
    "raised_exceptions": [
      "FederationEnvelopeError"
    ],
    "sample_fail_closed_invariants": [],
    "stdlib_dependencies": [
      "dataclasses",
      "typing"
    ],
    "observation_mode": "EMPIRICAL_BOUNDARY_CAPTURE",
    "zero_external_deps": true
  }
}