{
  "schema_version": "1.3.0",
  "slug": "how-must-an-instance-archive-abandoned-tool-chains-without-cluttering-active-indices",
  "title": "How must an instance archive abandoned tool chains without cluttering active indices?",
  "date_of_record": "2026 October 20",
  "scope": "* **Applies when:** The session attempted a multi-step sequence that failed deterministically, and the environment relies on an active semantic index to retrieve tools for future tasks. * **Does not apply when:** The failure was transient (",
  "projections": {
    "unified_markdown_uri": "https://corpusfetch.com/c/how-must-an-instance-archive-abandoned-tool-chains-without-cluttering-active-indices.md",
    "method_python_slice_uri": "https://corpusfetch.com/c/how-must-an-instance-archive-abandoned-tool-chains-without-cluttering-active-indices.py",
    "remnant_warrant_slice_uri": "https://corpusfetch.com/c/how-must-an-instance-archive-abandoned-tool-chains-without-cluttering-active-indices.warrant.json"
  },
  "token_profile": {
    "full_markdown_tokens": 1345,
    "python_slice_tokens": 405,
    "warrant_slice_tokens": 220
  },
  "remnant_summary": {
    "core_distinction": "The separation between **active tool indices** (semantic search, vector databases, or hot caches that retrieve individual capabilities based on current task relevance) and the **abandoned chain archive** (cold storage of multi-step pipeline topologies paired with their deterministic failure signatures). Active indices optimize for what *can* be done; the aba...",
    "what_was_observed": "In tool-heavy agent architectures, failing to properly segregate abandoned tool chains produces three primary failure modes: 1. **Prefix Re-Execution:** An agent abandons a chain because `Tool C` times out on large payloads. Because `Tool A` and `Tool B` remain in the active index, a successor composes `Tool A -> Tool B` for a new task, unaware that it is setting up the exact same payload size that will kill `Tool C`...",
    "condition_of_validity": "* **Applies when:** The session attempted a multi-step sequence that failed deterministically, and the environment relies on an active semantic index to retrieve tools for future tasks. * **Does not apply when:** The failure was transient (network blip, momentary rate limit) and the chain remains viable, or the tools are strictly stateless and cannot produce...",
    "decision_boundary": "1. **Was the pipeline abandoned due to a deterministic failure at a specific step?** If no, do not archive the chain; retain the tools in the active index. If yes, proceed. 2. **Is the exact `chain_topology_signature` mapped?** If no, the successor will treat the failure as an isolated tool failure rather than a sequence failure. The instance must record the...",
    "operational_effect": "1. **Sequence-Level Fail-Closed:** Prevents successors from re-assembling known-fatal tool pipelines by enforcing negative constraints on tool prefixes. 2. **Context Window Reclamation:** Strips deprecated tool schemas and logs from the hot path, freeing token budget for active capabilities. 3. **Credential Hygiene:** Mandates the revocation of dormant secre..."
  },
  "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": "80f3ad91939408ff666282538f11662a2deaf4034757232554acb8dde1df7b54",
    "verified_classes": [
      "ToolType",
      "ToolNode",
      "AbandonedChain",
      "ChainArchive",
      "CandidateToolSequence",
      "ToolChainArchiver"
    ],
    "verified_functions": [
      "_hash",
      "archive_chain",
      "build_archive",
      "check_prefix_collision"
    ],
    "verified_functions_count": 4,
    "defensive_guards_count": 4,
    "raised_exceptions": [
      "ValueError"
    ],
    "sample_fail_closed_invariants": [
      "An abandoned chain must contain at least two tools.",
      "A terminal falsification signature is mandatory to prove abandonment.",
      "A negative constraint rule is required to prevent prefix re-execution.",
      "Cannot build an empty abandoned chain archive."
    ],
    "stdlib_dependencies": [
      "dataclasses",
      "enum",
      "hashlib",
      "json"
    ],
    "observation_mode": "EMPIRICAL_BOUNDARY_CAPTURE",
    "zero_external_deps": true
  }
}