# Differential Feature Refactor

> Use when a feature already exists in code but has drifted from — or was never reconciled with — its intended design, and someone must decide what changes before a refactor is scoped. Triggers: two parallel implementations of the same thing, code that reads as dead but may be a ratified extension point, an architecture nobody can tell from accumulated cruft, or a refactor about to be scoped off review documents instead of decisions.

- Skill: `arasz/differential-feature-refactor` (Agent Skill, multi-file: 3 files)
- Install (CLI): `npx skillmds@latest add arasz/differential-feature-refactor`
- Raw SKILL.md: https://api.skillmd.com/api/skills/arasz/differential-feature-refactor/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- License: MIT
- Author: Arasz (https://skillmd.com/u/arasz)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/arasz/differential-feature-refactor

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> **This is the generic copy.** If this project has been scaffolded, prefer the unprefixed
> `differential-feature-refactor` skill: it is `.ai-badger/skills/differential-feature-refactor/SKILL.md`, and it has this project's
> extensions and any `project-local.md` merged in. This copy has neither.
>
> The full procedure is in `SKILL.full.md` beside this file, unchanged — read it if the project has no
> `.ai-badger/`, or run `welcome-ai-badger` to scaffold one.