=== gbrain brief-writer CODEX, improved prompt, 2 nights, 3+3 tasks ===
{
  "benchmark": "gbrain-evals/skillopt-v1",
  "backend": "codex",
  "model": "(default)",
  "n_seeds": 1,
  "n_improved": 1,
  "tokens_used": 9990,
  "results": [
    {
      "seed": "brief-writer",
      "held_out_before": 0.0,
      "held_out_after": 1.0,
      "improved": true,
      "nights": 2,
      "trace": [
        {
          "night": 0,
          "held_out_hard": 0.0,
          "action": "baseline"
        },
        {
          "night": 1,
          "held_out_hard": 0.0,
          "action": "accept_new_best",
          "accepted": true,
          "edits": [
            "Every brief must include a clearly labeled section exactly titled `Key Risks`.",
            "Every brief must include a line beginning `Confidence:` followed by a concise confidence level or rationale."
          ]
        },
        {
          "night": 2,
          "held_out_hard": 1.0,
          "action": "accept_new_best",
          "accepted": true,
          "edits": [
            "- Preserve required sections even when keeping the brief short; shorten the analysis before omitting `## Key Risks` or `Confidence:`."
          ]
        }
      ],
      "final_skill_tail": "tside this block are never touched._\n\n- Every brief must include a clearly labeled section exactly titled `Key Risks`.\n- Every brief must include a line beginning `Confidence:` followed by a concise confidence level or rationale.\n- Preserve required sections even when keeping the brief short; shorten the analysis before omitting `## Key Risks` or `Confidence:`.\n<!-- SKILLOPT-SLEEP:LEARNED END -->\n"
    }
  ]
}