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            ]
          }
        }
      }
    ],
    "aggregates": {
      "with_skill": {
        "case_count": 3,
        "pass_count": 3,
        "borderline_count": 0,
        "mean_score": 0.991667,
        "stddev": 0.014434
      },
      "baseline": {
        "case_count": 3,
        "pass_count": 3,
        "borderline_count": 0,
        "mean_score": 0.988889,
        "stddev": 0.019245
      },
      "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": 0.991667,
    "baseline_score": 0.988889,
    "delta": 0.002778,
    "delta_uncertainty": 0.024056
  },
  "verification_level": "TESTED",
  "receipt_hash": "b3cd3ced76180ed975ee3b80073889f2f469a350295428e05f4c73e83127a6b8",
  "economics": {
    "basis": "metered-equivalent",
    "surface": "claude-cli",
    "with_skill": {
      "call_count": 10,
      "mean_input_tokens": 3106.9,
      "mean_output_tokens": 732.2,
      "mean_cost_usd_per_call": 0.013536,
      "median_wall_ms": 8940.5,
      "wall_ms_p25": 7399,
      "wall_ms_p75": 9344,
      "wall_ms_iqr": 1945
    },
    "baseline": {
      "call_count": 9,
      "mean_input_tokens": 1947.56,
      "mean_output_tokens": 685.11,
      "mean_cost_usd_per_call": 0.010746,
      "median_wall_ms": 8467,
      "wall_ms_p25": 7285,
      "wall_ms_p75": 8905,
      "wall_ms_iqr": 1620
    },
    "skill_incremental_cost_usd_per_call": 0.00279,
    "skill_incremental_cost_usd_per_1k_calls": 2.79,
    "output_tokens_delta": 47.09,
    "median_wall_ms_delta": 473.5,
    "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": 0.069577,
      "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"
    }
  }
}
