{
  "schema": "anvil-investigation.cache-admission-diagnosis/v1",
  "engine_revision": "bace20dc70249eed6402b66d4852c6c3f9612905",
  "source_capture": "Read-only capture from the exact retained Swift image; no model requests or lifecycle changes.",
  "observed_from_independent_native_review": {
    "warm_request": 178,
    "completed_captures": 0,
    "changed_cached_tokens": 0,
    "changed_host_to_device_transfers": 0,
    "preserve_thinking": true,
    "preserve_thinking_semantic_change": false
  },
  "facts": [
    {
      "source": "resource_manager.h:1681-1705",
      "fact": "DefaultAutomatic first-seen shared candidates require vacant shared slots, otherwise declared ExplicitBoundary/RequestedAutomatic evidence or at least two matching reuse domains. Only declared or repeated candidates are pressure-capable."
    },
    {
      "source": "resource_manager.h:582-607",
      "fact": "Occupied shared-owner replacement during active capture similarly requires explicit/requested evidence or two matching reuse domains."
    },
    {
      "source": "resource_manager.h:1781-1813 and shared_capture_planner.h:311-380",
      "fact": "Declared candidates receive explicit shared credit but capture still requires positive portfolio benefit after private retention loss and immediate/schedule costs. This is not guaranteed pinning."
    },
    {
      "source": "resource_manager.h:3098-3111,1327",
      "fact": "Published explicit credit expires after the bounded32-demand window."
    },
    {
      "source": "resource_manager.h:323-363",
      "fact": "Matching exact private resident checkpoints are considered without requiring a session key; a session binding changes retention/source handling, not general prefix eligibility."
    },
    {
      "source": "openai_common.cpp:53-64,83-104,165-177",
      "fact": "prompt_cache_key is validated only here, not assigned as a chat session. prompt_cache_options mode implicit selects RequestedAutomatic; mode explicit suppresses the default endpoint marker. Engine automatic shared-prefix inference is disabled in favor of protocol markers."
    },
    {
      "source": "openai_chat_request.cpp:356-357 and openai_common.cpp:41-50",
      "fact": "A content-part prompt_cache_breakpoint={mode:explicit} declares a boundary. This is NInfer-supported request syntax; do not substitute generic cache_control without source support."
    }
  ],
  "interpretation": "Warm zero-capture with occupied catalogs is consistent with adaptive default admission refusing this first-seen checkpoint. Preserved reasoning and identical history alone do not prove a resident checkpoint survived pressure. Native observations do not expose every planner rejection, so exact per-candidate reason remains an inference, not a uniquely proven branch.",
  "next_plan_constraint": "If another request is authorized, predeclare cache-aware shape with explicit content-part boundary or requested-automatic evidence, require observed capture before pressure, then native positive reuse plus changed-value correctness. Do not repeat default warm-and-pressure blindly; explicit markers do not guarantee retention.",
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