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        },
        "counts": {
          "generations_per_arm": 3
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      }
    ],
    "aggregates": {
      "with_skill": {
        "case_count": 3,
        "pass_count": 3,
        "borderline_count": 0,
        "mean_score": 0.922222,
        "stddev": 0.078764
      },
      "baseline": {
        "case_count": 3,
        "pass_count": 3,
        "borderline_count": 0,
        "mean_score": 0.925,
        "stddev": 0.058333
      },
      "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": 0.922222,
    "baseline_score": 0.925,
    "delta": -0.002778,
    "delta_uncertainty": 0.098013
  },
  "verification_level": "TESTED",
  "receipt_hash": "05a14c53c635688d45acf8c62836a7d47ded2c60e9b78c4a7edef3a5e5329854",
  "economics": {
    "basis": "metered-equivalent",
    "surface": "claude-cli",
    "with_skill": {
      "call_count": 9,
      "mean_input_tokens": 4872.44,
      "mean_output_tokens": 1626.56,
      "mean_cost_usd_per_call": 0.02601,
      "median_wall_ms": 13313,
      "wall_ms_p25": 11958.5,
      "wall_ms_p75": 23319,
      "wall_ms_iqr": 11360.5
    },
    "baseline": {
      "call_count": 10,
      "mean_input_tokens": 2031.6,
      "mean_output_tokens": 920.6,
      "mean_cost_usd_per_call": 0.013269,
      "median_wall_ms": 10417,
      "wall_ms_p25": 9213,
      "wall_ms_p75": 13539,
      "wall_ms_iqr": 4326
    },
    "skill_incremental_cost_usd_per_call": 0.012741,
    "skill_incremental_cost_usd_per_1k_calls": 12.741,
    "output_tokens_delta": 705.96,
    "median_wall_ms_delta": 2896,
    "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": 0.075215,
      "case_rows_measured": 6,
      "judged_draws_counted": 19,
      "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"
    }
  }
}
