# Refactor

> Execute one behavior-preserving structural transformation and report evidence. Triggers: "refactor this", "simplify without changing behavior".

- Skill: `majiayu000/refactor-10` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds add majiayu000/refactor-10`
- Raw SKILL.md: https://api.skillmd.com/api/skills/majiayu000/refactor-10/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Docs & Writing
- Author: majiayu000 (https://skillmd.com/u/majiayu000)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/majiayu000/refactor-10

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# Refactor — one structural experiment

Refactor changes structure while preserving observable behavior. It performs one
caller-selected transformation and reports the result.

## Procedure

1. Name the preserved behavior and the focused acceptance surface.
2. Record an honest baseline, including any reproducible ambient failures.
3. Apply one bounded transformation: extract, rename, inline, simplify,
   encapsulate, move, or delete dead code.
4. Run the focused check and the smallest package-level regression check justified
   by the changed surface.
5. Return the diff summary, commands, results, and behavior not checked.

Do not combine a newly discovered behavior fix with the structural change. A red
result is evidence for the caller; this skill does not revert, narrow, retry,
commit, validate, or route subsequent work automatically.

## References

- [Behavior-preserving simplification](references/behavior-preserving-simplification.md)
- [Behavior scenarios](references/refactor.feature)