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                "draw": 2,
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                "phase": "judge",
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                "phase": "judge",
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              },
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                "phase": "judge",
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                "phase": "judge",
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              {
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              },
              {
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              {
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                "sample": 0,
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              },
              {
                "phase": "judge",
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                "draw": 5,
                "sample": 1,
                "model": "claude-haiku-5-5",
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                  "claude-haiku-5-5"
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              },
              {
                "phase": "judge",
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                "draw": 5,
                "sample": 2,
                "model": "claude-haiku-5-5",
                "reported_models": [
                  "claude-haiku-5-5"
                ]
              },
              {
                "phase": "judge",
                "case": "unclear",
                "mode": "baseline",
                "draw": 5,
                "sample": 3,
                "model": "claude-haiku-5-5",
                "reported_models": [
                  "claude-haiku-5-5"
                ]
              },
              {
                "phase": "judge",
                "case": "unclear",
                "mode": "baseline",
                "draw": 5,
                "sample": 4,
                "model": "claude-haiku-5-5",
                "reported_models": [
                  "claude-haiku-5-5"
                ]
              }
            ]
          }
        },
        "counts": {
          "generations_per_arm": 6
        }
      }
    ],
    "aggregates": {
      "with_skill": {
        "case_count": 3,
        "pass_count": 2,
        "borderline_count": 1,
        "mean_score": 0.868889,
        "stddev": 0.12633
      },
      "baseline": {
        "case_count": 3,
        "pass_count": 0,
        "borderline_count": 1,
        "mean_score": 0.532222,
        "stddev": 0.086303
      },
      "band_rule": "per arm: the sample standard deviation (n-1) of the per-case means across the included cases; the comparison band is the quadrature sum of the two arms; null where an arm has fewer than two included cases"
    }
  },
  "comparison": {
    "with_skill_score": 0.868889,
    "baseline_score": 0.532222,
    "delta": 0.336667,
    "delta_uncertainty": 0.152995
  },
  "verification_level": "TESTED",
  "receipt_hash": "cb33a80a2e7db6d3d612b4ea17dcd7648b245fe68eb6adc08989983b6e2a98db",
  "economics": {
    "basis": "metered-equivalent",
    "surface": "claude-cli",
    "with_skill": {
      "call_count": 11,
      "mean_input_tokens": 2968.27,
      "mean_output_tokens": 1316.18,
      "mean_cost_usd_per_call": 0.019098,
      "median_wall_ms": 11215,
      "wall_ms_p25": 8490,
      "wall_ms_p75": 16241,
      "wall_ms_iqr": 7751
    },
    "baseline": {
      "call_count": 19,
      "mean_input_tokens": 2021.16,
      "mean_output_tokens": 935.58,
      "mean_cost_usd_per_call": 0.013398,
      "median_wall_ms": 9633,
      "wall_ms_p25": 8480,
      "wall_ms_p75": 10328,
      "wall_ms_iqr": 1848
    },
    "skill_incremental_cost_usd_per_call": 0.0057,
    "skill_incremental_cost_usd_per_1k_calls": 5.7,
    "output_tokens_delta": 380.6,
    "median_wall_ms_delta": 1582,
    "judge_excluded": true,
    "judge_overhead": {
      "note": "Measurement overhead imposed by Driftproof, NOT a cost of running the skill. Excluded from every field above. Counted over every draw sent to the judge, each once: the usage its answered judge samples reported, at the frozen judge price. Retried attempts and samples that reported no usage are not in it.",
      "total_cost_usd": 0.139451,
      "case_rows_measured": 6,
      "judged_draws_counted": 30,
      "judged_draws_missing_usage": 0
    },
    "notes": {
      "absolute_cost": "Absolute per-call cost on a CLI surface includes a fixed harness preamble (observed ~25k input tokens on claude-cli, ~11k on codex) that we do not control. It is identical in the with-skill and baseline arms, so it cancels in the Δ figures — read the incremental columns, not the absolute ones.",
      "cache_pricing": "Cached input tokens are costed at the list input rate (an over-estimate where caching is heavy); cached_tokens is recorded per call so a reader can recompute.",
      "latency": "observed on subscription CLI surface, indicative"
    }
  }
}
