refactor — for Claude Code refactor, psc-comet, community, for Claude Code, ide skills, Behavior-preserving, restructuring, different, structure, produces

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このスキルについて

適した場面: Ideal for AI agents that need behavior-preserving restructuring. the goal is a different structure that produces identical. ローカライズされた概要: # Refactor Skill Behavior-preserving restructuring. This AI agent skill supports Claude Code, Cursor, and Windsurf workflows.

機能

Behavior-preserving restructuring. The goal is a different structure that produces identical
What Claude Gets Wrong Without This Skill
The Behavior Contract
The One-Change Rule
One structural change at a time:

# 主なトピック

for Claude Code Behavior-preserving restructuring different structure produces
andrem-sec andrem-sec
[1]
[0]
更新日: 4/2/2026

Skill Overview

Start with fit, limitations, and setup before diving into the repository.

適した場面: Ideal for AI agents that need behavior-preserving restructuring. the goal is a different structure that produces identical. ローカライズされた概要: # Refactor Skill Behavior-preserving restructuring. This AI agent skill supports Claude Code, Cursor, and Windsurf workflows.

このスキルを使用する理由

推奨ポイント: refactor helps agents behavior-preserving restructuring. the goal is a different structure that produces identical. Refactor Skill Behavior-preserving restructuring. This AI agent skill supports Claude Code

おすすめ

適した場面: Ideal for AI agents that need behavior-preserving restructuring. the goal is a different structure that produces identical.

↓ 実現可能なユースケース for refactor

ユースケース: Behavior-preserving restructuring. The goal is a different structure that produces identical
ユースケース: What Claude Gets Wrong Without This Skill
ユースケース: The Behavior Contract

! セキュリティと制限

  • 制約事項: Do not batch. Do not "while I'm in here" add improvements. Do not rename AND restructure in one change.
  • 制約事項: Remove duplication Same logic in 3+ places — but only if the logic is genuinely identical, not just similar
  • 制約事項: Do not refactor code you do not understand. Read it until you can state its behavior contract before touching it.

About The Source

The section below is adapted from the upstream repository. Use it as supporting material alongside the fit, use-case, and installation summary on this page.

Labs デモ

Browser Sandbox Environment

⚡️ Ready to unleash?

Experience this Agent in a zero-setup browser environment powered by WebContainers. No installation required.

Boot Container Sandbox

FAQ とインストール手順

These questions and steps mirror the structured data on this page for better search understanding.

? よくある質問

refactor とは何ですか？

適した場面: Ideal for AI agents that need behavior-preserving restructuring. the goal is a different structure that produces identical. ローカライズされた概要: # Refactor Skill Behavior-preserving restructuring. This AI agent skill supports Claude Code, Cursor, and Windsurf workflows.

refactor はどうやって導入しますか？

次のコマンドを実行してください: npx killer-skills add andrem-sec/psc-comet。Cursor、Windsurf、VS Code、Claude Code など19以上のIDEで使えます。

refactor の主な用途は？

主な用途は次のとおりです: ユースケース: Behavior-preserving restructuring. The goal is a different structure that produces identical, ユースケース: What Claude Gets Wrong Without This Skill, ユースケース: The Behavior Contract。

refactor に対応するIDEは？

このスキルは Cursor, Windsurf, VS Code, Trae, Claude Code, OpenClaw, Aider, Codex, OpenCode, Goose, Cline, Roo Code, Kiro, Augment Code, Continue, GitHub Copilot, Sourcegraph Cody, and Amazon Q Developer に対応しています。統一された導入には Killer-Skills CLI を使えます。

refactor に制限はありますか？

制約事項: Do not batch. Do not "while I'm in here" add improvements. Do not rename AND restructure in one change.. 制約事項: Remove duplication Same logic in 3+ places — but only if the logic is genuinely identical, not just similar. 制約事項: Do not refactor code you do not understand. Read it until you can state its behavior contract before touching it..

↓ このスキルの導入方法

  1. 1. ターミナルを開く

    プロジェクトディレクトリでターミナルまたはコマンドラインを開きます。

  2. 2. インストールコマンドを実行

    npx killer-skills add andrem-sec/psc-comet を実行してください。CLI がIDEまたはエージェントを自動検出し、スキルを設定します。

  3. 3. スキルを使い始める

    このスキルはすぐに有効になります。現在のプロジェクトで refactor をすぐ使えます。

! Source Notes

This page is still useful for installation and source reference. Before using it, compare the fit, limitations, and upstream repository notes above.

Upstream Repository Material

The section below is adapted from the upstream repository. Use it as supporting material alongside the fit, use-case, and installation summary on this page.

Upstream Source

refactor

# Refactor Skill Behavior-preserving restructuring. This AI agent skill supports Claude Code, Cursor, and Windsurf workflows. Behavior-preserving

SKILL.md
Readonly
Upstream Repository Material
The section below is adapted from the upstream repository. Use it as supporting material alongside the fit, use-case, and installation summary on this page.
Upstream Source

Refactor Skill

Behavior-preserving restructuring. The goal is a different structure that produces identical observable behavior.

What Claude Gets Wrong Without This Skill

Without refactor discipline, "refactoring" becomes a mix of restructuring, behavior changes, and new features in one pass. When something breaks, there is no way to know which change caused it. Tests that fail mid-refactor mean the scope was too large, but without the discipline to go one change at a time, the error is impossible to isolate.

The Behavior Contract

Before touching any code, state what it currently does in terms of observable behavior — inputs, outputs, side effects. This is the contract.

If the refactor changes any of these, it is not a refactor — it is a feature change or a bug fix. Handle those separately.

The One-Change Rule

One structural change at a time:

  • Extract a function
  • Rename a variable
  • Remove duplication
  • Flatten nesting
  • Extract a class
  • Move a module

Run tests after each. If they pass, continue. If they fail, the change broke something — revert it and understand why before proceeding.

Do not batch. Do not "while I'm in here" add improvements. Do not rename AND restructure in one change.

The Coverage Gate

Refactoring without tests is rearranging furniture in the dark. Before the first structural change:

  • Run the test suite
  • Check coverage
  • If coverage is below 80% on the code being refactored, stop and write tests first

This is not optional. Skipping it means the refactor cannot be verified.

Common Refactor Operations

OperationWhen to Use
Extract functionBlock of code used in 2+ places, or a block that has a single clear responsibility
RenameName does not reflect current purpose (this happens after behavior is understood, not before)
Remove duplicationSame logic in 3+ places — but only if the logic is genuinely identical, not just similar
Flatten nestingMore than 3 levels of nesting in a single function
Extract classA function or module has grown to handle 2+ distinct concerns
InlineAn abstraction that adds complexity without clarity — sometimes the direct version is better

Anti-Patterns

Do not refactor code you do not understand. Read it until you can state its behavior contract before touching it.

Do not refactor and fix bugs in the same pass. Fix first, then refactor.

Do not refactor code with no tests. Write tests first.

Do not "improve" variable names speculatively — rename only when you understand the current name is wrong.

Mandatory Checklist

  1. Verify test coverage was checked before any changes
  2. Verify the behavior contract was stated before any structural changes
  3. Verify only one structural change was made per test run
  4. Verify no test failures occurred without a full stop and reassessment
  5. Verify the full test suite passes after all changes
  6. Verify coverage did not regress
  7. Verify the behavior contract is still satisfied after all changes

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