{
  "cache_miss_hypotheses": [
    {
      "action": "Move diffs, logs, timestamps, and command output after stable reusable prompt prefixes.",
      "confidence": "partial",
      "evidence": "inferred",
      "id": "volatile-prefix-breakers",
      "reason": "Redacted prompt segment hashes show volatile content near the prefix window."
    }
  ],
  "caveats": [
    "Cache diagnostics are local transcript heuristics and do not prove exact provider cache-prefix state.",
    "Provider cache read/write fields are diagnostic telemetry and do not prove ContextGuard-caused token reduction.",
    "Stable-prefix and breaker positions come from bounded redacted segment hashes, not raw prompt text."
  ],
  "confidence": "hypothesis",
  "derived_ratios": {
    "cache_read_share": {
      "evidence": "inferred",
      "value": 0.7009345794392523
    },
    "cache_reuse_ratio": {
      "evidence": "inferred",
      "value": 2.5
    }
  },
  "dynamic_prefix_breakers": [
    {
      "action": "Move diffs, logs, timestamps, and command output after stable reusable prompt prefixes.",
      "confidence": "partial",
      "evidence": "inferred",
      "heuristic": true,
      "position": 2,
      "sample_count": 2,
      "stability": 0.5,
      "trigger": "prefix_position",
      "unique_hashes": 2,
      "volatile_share": 0.5
    }
  ],
  "evidence": "inferred",
  "headroom_diagnostics": {
    "evidence": "unavailable",
    "historical_total_tokens_are_not_headroom": true,
    "observable_via": "live_statusline_snapshot",
    "reason": "Transcript scans do not carry live context-window or remaining-token data, so context headroom cannot be observed or conservatively inferred from history alone.",
    "required_observation": "live_statusline_snapshot",
    "status": "missing"
  },
  "heuristic": true,
  "observations": {
    "cache_creation_tokens": 60000,
    "cache_fields": {
      "derived": {
        "cache_read_share": {
          "evidence": "inferred",
          "value": 0.7009345794392523
        },
        "cache_reuse_ratio": {
          "evidence": "inferred",
          "value": 2.5
        }
      },
      "evidence": "observed",
      "present_fields": {
        "cache_creation": 2,
        "cache_read": 2
      },
      "status": "available",
      "zero_values_observed": {
        "cache_creation": false,
        "cache_read": false
      }
    },
    "cache_read_tokens": 150000
  },
  "schema_version": "contextguard.cache-diagnostics.v1",
  "stable_prefix_candidates": [
    {
      "action": "Keep stable instructions, policies, and reusable context before run-specific evidence.",
      "confidence": "partial",
      "evidence": "inferred",
      "position": 0,
      "sample_count": 2,
      "stability": 1.0,
      "unique_hashes": 1,
      "volatile_share": 0.0
    },
    {
      "action": "Keep stable instructions, policies, and reusable context before run-specific evidence.",
      "confidence": "partial",
      "evidence": "inferred",
      "position": 1,
      "sample_count": 2,
      "stability": 1.0,
      "unique_hashes": 1,
      "volatile_share": 0.0
    }
  ],
  "status": "partial",
  "ttl_diagnostics": {
    "candidate": "between-5m-and-1h",
    "caveats": [
      "Timestamped cache telemetry records do not prove exact provider cache-prefix identity or provider cache TTL state.",
      "5-minute versus 1-hour TTL guidance is a local hypothesis unless corroborated with provider telemetry and repeated stable prefixes."
    ],
    "confidence": "hypothesis",
    "evidence": "inferred",
    "interval_basis": "positive_timestamped_cache_records",
    "positive_timestamped_cache_record_count": 2,
    "reason": "Positive timestamped cache telemetry records bound the local cache-observation span, but exact provider cache TTL reuse remains a hypothesis.",
    "status": "hypothesis",
    "timestamped_cache_record_count": 2,
    "timestamped_cache_record_span_seconds": 450
  }
}