Refactor

Target: $ARGUMENTS (file, directory, or module — if blank, use unstaged changes)

Behavior is frozen — the test suite is the contract. Green before and after; if a test's meaning has to change, you've gone too far.

Workflow

1. Scope

• Identify target files (blank → unstaged changes)
• Locate each file's tests using the project's convention (co-located, __tests__/, tests/, spec/). A file with no tests gets Test gaps items first — Split/Simplify on untested code is unverifiable, so backfill or skip. No test runner at all → ask which to use. UI flows → backfill end-to-end tests: call the Skill tool with tdd, which holds the UI-tests reference. Entrypoint scripts without exports → audit only.
• Run the suite. If red, stop — don't refactor broken code

2. Audit

List findings, most-impactful first: