docs(adr): WP-04 classifier モデル格上げを実測評価し見送り (ADR-038 amendment) - #245
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Opus gold baseline (real findings 30 + キュレート FP 5 = 35件) で 5 モデルを比較: - 全候補が FP 検出を改善せず (gold FP 6件中 正検出 最良でも 1、全モデル 3-4件を有害な auto_fix に誤分類) - accuracy 最良の qwen3-coder:30b は human_review を auto_fix に誤送する安全後退 - 中型 dense は劣化 (gemma4:12b/31b=0.57) or 破綻 (gemma4:26b=27 invalid) - mistral:7b は安全軸完璧 (human_review 0 誤送)・最軽量 → 維持 結論・eval 手法・安全軸知見を ADR-038 amendment に記録。plan WP-04 見送り、順位 256 (FP-tune 再評価) 登録。
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📝 WalkthroughWalkthroughADR-038 に classifier モデル格上げ候補(gemma4系・qwen3-coder:30b)の Claude Opus gold baseline 実測比較と見送り判断を追記。harness-improvement-plan.md の WP-04 状態を「見送り」に更新し、todo-summary.md と todo13.md に FP 検出強化プロンプトでの再評価 follow-up タスクを追加した。 Changesclassifier 格上げ見送りドキュメント更新
Estimated code review effort: 1 (Trivial) | ~5 minutes Possibly related PRs
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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概要
WP-04「classifier モデル格上げ」を実測評価し、格上げを見送り・
mistral:7bを維持する。ADR-038 の findings classification の精度向上 (特にfalse_positive_likely判定改善) を狙ったが、どの候補モデルも主目的を達成せず、最良候補は安全を後退させたため。ADR-038 の amendment。docs/harness-improvement-plan.mdの 3 ステップ知識移管(permanent 先行 → 参照付替 → ephemeral 更新)に従う。docs-only。実測 (Opus gold baseline、ADR-038 Phase a 方式、n=35)
real CodeRabbit findings 30 件 + キュレート FP 例 5 件を Opus が gold action 付与し、5 モデルの一致率・FP 処理・安全軸を比較。
結論と根拠
変更内容 (docs-only)
docs/adr/adr-038-...md: § classify モデル格上げの評価と見送り (2026-07-05 追記) — eval 手法・結果表・「保守バイアス=安全機能」「FP検出=能力限界」の知見・妥当性の脅威docs/harness-improvement-plan.md: WP-04 を「見送り」に更新docs/todo-summary.md/docs/todo13.md: 順位 256 — FP 検出強化プロンプトで再評価 (能力限界か prompt 不適合かの切り分け、Tier 5)参照
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