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refactor

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<!-- i18n-source: 03-skills/refactor/SKILL.md -->
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<!-- i18n-date: 2026-04-27 -->
---
name: refactor
description: Martin Fowler の方法論に基づく体系的なコードリファクタリング。ユーザーがコードのリファクタリング、コード構造の改善、技術的負債の削減、レガシーコードのクリーンアップ、コードスメルの解消、コード保守性の向上を求めた際に使用する。本スキルは、リサーチ・計画・安全な段階的実装からなる段階的アプローチを案内する。
---

# コードリファクタリングスキル

Martin Fowler 著『Refactoring: Improving the Design of Existing Code』(第 2 版) に基づくコードリファクタリングへの体系的アプローチ。本スキルは、テストに支えられた安全で段階的な変更を重視する。

> "Refactoring is the process of changing a software system in such a way that it does not alter the external behavior of the code yet improves its internal structure." — Martin Fowler

## 中核となる原則
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