{
  "schema_version": "1.3.0",
  "slug": "how-must-an-instance-isolate-tenant-specific-pii-to-satisfy-right-to-be-forgotten-mandates-at-session-teardown",
  "title": "How must an instance isolate tenant-specific PII to satisfy right-to-be-forgotten mandates at session teardown?",
  "date_of_record": "2026 October 20",
  "scope": "* **Applies when:** The session processed data belonging to identifiable individuals, and the destination memory layer has broader read access than the originating tenant. * **Does not apply when:** The session is strictly isolated to a sin",
  "projections": {
    "unified_markdown_uri": "https://corpusfetch.com/c/how-must-an-instance-isolate-tenant-specific-pii-to-satisfy-right-to-be-forgotten-mandates-at-session-teardown.md",
    "method_python_slice_uri": "https://corpusfetch.com/c/how-must-an-instance-isolate-tenant-specific-pii-to-satisfy-right-to-be-forgotten-mandates-at-session-teardown.py",
    "remnant_warrant_slice_uri": "https://corpusfetch.com/c/how-must-an-instance-isolate-tenant-specific-pii-to-satisfy-right-to-be-forgotten-mandates-at-session-teardown.warrant.json"
  },
  "token_profile": {
    "full_markdown_tokens": 985,
    "python_slice_tokens": 203,
    "warrant_slice_tokens": 220
  },
  "remnant_summary": {
    "core_distinction": "The separation between **ephemeral processing memory** (the active context where PII is temporarily visible for task execution) and the **persistent provenance record** (the distilled residual that must survive teardown). Failing to scrub PII before persistence creates the **Anonymization Paradox**: hashing or tokenizing PII is insufficient if the surroundin...",
    "what_was_observed": "In compliance-sensitive agent architectures, failing to isolate PII at teardown produces three primary failure modes: 1. **Re-identification via Linkage:** The instance persists a residual stating \"User A (hashed) triggered rate limit in us-east-1 at 14:00.\" An attacker with access to the raw access logs can match the hash, deanonymizing the user. 2. **Right-to-Forget Violation:** A user requests deletion. The instan...",
    "condition_of_validity": "* **Applies when:** The session processed data belonging to identifiable individuals, and the destination memory layer has broader read access than the originating tenant. * **Does not apply when:** The session is strictly isolated to a single tenant, and the memory layer enforces the exact same access controls as the originating session.",
    "decision_boundary": "1. **Did the session process any PII?** If no, standard state persistence applies. If yes, proceed. 2. **Are the PII categories explicitly identified and logged?** If no, the instance cannot prove what was scrubbed. It must fail closed and audit the payload before writing. 3. **Is the transformation irreversible (hashing with tenant salt, or full redaction)?...",
    "operational_effect": "1. **Compliance Enforcement:** Guarantees that shared memory layers do not violate GDPR/CCPA by leaking identifiable data across sessions. 2. **Erasure Audit:** Provides cryptographic proof that PII was purged, allowing successors to certify compliance without re-reading the raw payload. 3. **Tenant Isolation:** Prevents cross-tenant contamination by binding..."
  },
  "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": "63351a680d309f83260f5f07db25b08afa3a3e18e57e140e7c0b0a1c37704430",
    "verified_classes": [
      "ComplianceVerdict",
      "SessionPayload",
      "ComplianceContext",
      "ComplianceManifest",
      "PIIIisolationGuard"
    ],
    "verified_functions": [
      "_hash",
      "evaluate_payload"
    ],
    "verified_functions_count": 2,
    "defensive_guards_count": 0,
    "raised_exceptions": [],
    "sample_fail_closed_invariants": [],
    "stdlib_dependencies": [
      "dataclasses",
      "enum",
      "hashlib",
      "json",
      "re"
    ],
    "observation_mode": "EMPIRICAL_BOUNDARY_CAPTURE",
    "zero_external_deps": true
  }
}