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ZenkakuHiragana
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refactoring

Identify and execute behavior-preserving refactors to improve code structure.

Updated Mar 29, 2026
Search Tags:#testing#architecture#maintainability#refactor#modularization#boundary#code-cleanup
One-click install
npx skills add https://github.com/ZenkakuHiragana/my-chezmoi-config --skill refactoring-zenkakuhiragana
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: refactoring
Source: https://github.com/ZenkakuHiragana/my-chezmoi-config/tree/main/dot_config/opencode/skills/refactoring
Command: npx skills add https://github.com/ZenkakuHiragana/my-chezmoi-config --skill refactoring-zenkakuhiragana

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This skill guides behavior-preserving cleanup of existing code to improve structure, naming, boundaries, and maintainability while preserving current behavior.

Core Features & Use Cases

  • Identify candidate refactor opportunities to improve cohesion and reduce duplication without changing external behavior.
  • Provide a safe, incremental workflow with validation criteria, tests, and documentation alignment.
  • Use case: refactor a large module into smaller, well-scoped components while preserving API contracts.

Quick Start

Start by outlining the current structure and propose a minimal, validated refactor plan that preserves behavior.

Frequently Asked Questions about refactoring

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I refactor a large module without breaking its public API contracts?▼

To refactor a large module safely, you identify behavior-preserving structural changes to improve cohesion and reduce duplication while strictly preserving external API contracts. This incremental process validates changes using targeted tests and documentation alignment to maintain behavioral stability.

What is the best way to untangle responsibilities and reduce duplication in a medium-to-large codebase?▼

The best way to untangle responsibilities is behavior-preserving refactoring, which identifies candidate opportunities to improve boundaries, naming, and modularity. It guides incremental structural changes without altering external behavior or current functionality.

Can I use characterization tests to guide code cleanup in an existing project?▼

Yes, characterization tests validate changes during code cleanup by ensuring current behavior remains stable. You apply an incremental workflow that updates tests and documentation as needed, preserving public interfaces while improving code structure.

Does behavior-preserving refactoring work for medium-to-large codebases with hard-to-follow modules?▼

Yes, behavior-preserving refactoring specifically targets medium-to-large codebases where modules are hard to follow. It guides structural improvements to reduce tangled responsibilities and duplication while ensuring external contracts and behavioral stability are maintained.

When should I not use incremental refactoring for maintainability improvements?▼

You should avoid incremental refactoring when you cannot validate behavioral stability through characterization or targeted tests. Without existing tests to preserve public interfaces, altering tangled responsibilities risks breaking external contracts.

How do I start modularizing a large codebase into smaller, well-scoped components?▼

You start modularizing by outlining the current structure and proposing a minimal, validated refactor plan that preserves behavior. This safe, incremental workflow improves code boundaries and maintainability without changing external API contracts.

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