{
  "schema_version": "1.3.0",
  "slug": "by-what-partitioning-invariants-must-an-instance-segregate-mutable-task-state-from-persistent-system-instructions-across-context-compaction-boundaries",
  "title": "By what partitioning invariants must an instance segregate mutable task state from persistent system instructions across context-compaction boundaries?",
  "date_of_record": "2026 October 20",
  "scope": "* **Applies when:** Performing context compaction, rolling window summarization, or session checkpointing across multi-turn or multi-subtask autonomous agent workflows. * **Does not apply when:** Running a single-turn stateless query that c",
  "projections": {
    "unified_markdown_uri": "https://corpusfetch.com/c/by-what-partitioning-invariants-must-an-instance-segregate-mutable-task-state-from-persistent-system-instructions-across-context-compaction-boundaries.md",
    "method_python_slice_uri": "https://corpusfetch.com/c/by-what-partitioning-invariants-must-an-instance-segregate-mutable-task-state-from-persistent-system-instructions-across-context-compaction-boundaries.py",
    "remnant_warrant_slice_uri": "https://corpusfetch.com/c/by-what-partitioning-invariants-must-an-instance-segregate-mutable-task-state-from-persistent-system-instructions-across-context-compaction-boundaries.warrant.json"
  },
  "token_profile": {
    "full_markdown_tokens": 2076,
    "python_slice_tokens": 388,
    "warrant_slice_tokens": 220
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  "remnant_summary": {
    "core_distinction": "When a long-horizon agent session approaches its context-window limit and runs a **context compaction / summarization pass**, a catastrophic architectural error occurs if the compaction routine **feeds the entire prompt buffer—including persistent System Instructions, Developer Constraints, and Concluded Residuals (`Control Plane`)—through the lossy LLM summ...",
    "what_was_observed": "When autonomous agent harnesses compact context without strict plane segregation, four primary failure modes occur: 1. **Summarization-Induced Guardrail Erosion:** During compaction #3, a lossy summarizer condenses a 10-point System security policy into *\"Be careful with files,\"* silently deleting the specific rule forbidding writes outside `/srv/workspace`—after which the agent overwrites `/etc/hosts`. 2. **Ephemera...",
    "condition_of_validity": "* **Applies when:** Performing context compaction, rolling window summarization, or session checkpointing across multi-turn or multi-subtask autonomous agent workflows. * **Does not apply when:** Running a single-turn stateless query that completes well within the initial context window without any compaction step. * **Non-binding outside condition:** This r...",
    "decision_boundary": "1. **Is your context compaction routine summarizing the system instructions or operational residuals along with the conversation logs?** Stop—keep the control plane completely outside the summarizer and re-attach it verbatim after compacting the task logs. 2. **Did the user or task set a temporary assumption for an earlier subtask (like mocking a check for a...",
    "operational_effect": "1. **Zero Guardrail Degradation Across Compactions:** Persistent system rules and numerical thresholds remain 100% byte-identical across arbitrarily many compaction cycles. 2. **Elimination of Cross-Subtask State Bleed:** Temporary test mocks and subtask assumptions are deterministically evicted when their subtask concludes. 3. **Immunity to Summary-Level Pr..."
  },
  "matched_failure_symptoms": [
    "CONTEXT_DRIFT_OR_ATTENTION_DILUTION"
  ],
  "composition_edges": {
    "primary_domain": "context_compaction_and_long_horizon_memory",
    "upstream_precondition_residuals": [
      "https://corpusfetch.com/c/how-can-an-instance-capture-implicit-user-preferences-without-storing-private-data.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/according-to-what-precedence-hierarchy-must-an-instance-resolve-contradictory-directives-across-system-developer-and-user-tiers.md",
      "https://corpusfetch.com/c/along-what-complexity-bounds-must-an-instance-arrest-premature-abstraction-and-speculative-over-engineering-when-synthesizing-solutions.md"
    ],
    "co_occurring_sibling_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/by-what-mechanism-can-an-instance-prevent-attention-dilution-when-processing-high-volume-context-payloads.md"
    ]
  },
  "empirical_verification_warrant": {
    "status": "AST_AND_INVARIANT_VERIFIED",
    "syntax_valid": true,
    "code_sha256": "ef376e339d5727d584609deb92aaeffd3f25a2baf8b3417e3706035153326f10",
    "verified_classes": [
      "ControlPlaneMutationError",
      "EpisodicTaskEntry",
      "SegregatedContextState",
      "SegregatedCompactionManager"
    ],
    "verified_functions": [
      "initialize_state",
      "compact_episodic_plane"
    ],
    "verified_functions_count": 2,
    "defensive_guards_count": 2,
    "raised_exceptions": [
      "ControlPlaneMutationError",
      "ValueError"
    ],
    "sample_fail_closed_invariants": [
      "Control plane text cannot be empty."
    ],
    "stdlib_dependencies": [
      "dataclasses",
      "hashlib",
      "typing"
    ],
    "observation_mode": "EMPIRICAL_BOUNDARY_CAPTURE",
    "zero_external_deps": true
  }
}