refactor

name

refactor

description

Restructure existing code without changing its behavior — reduce duplication, improve naming, simplify complex logic, extract helpers, split overgrown functions, untangle dependencies. Use this skill when the user asks to refactor, clean up, simplify, DRY out, rename, extract a helper, split a file, or make code "nicer" — including when they describe code-quality concerns without using the word "refactor" (e.g. "this is messy", "приведи в порядок", "это можно сделать чище").

Refactor

Safely restructure code while preserving existing behavior.

Steps

1. Verify tests exist — Before touching anything, confirm test coverage on the code you'll change. If tests are missing, write them first against current behavior.
2. Name the problem — What exactly is wrong?
   • Duplicated logic? Function doing too many things? Poor naming? Tangled dependencies? Wrong abstraction?
3. Plan the change — Describe what you'll do before doing it. Small, safe steps.
4. One change at a time — Each step keeps the code working. Don't rewrite everything at once.
5. Run tests after each step — If tests fail, you changed behavior. Undo and try smaller.
6. Stop when good enough — Clear, tested, easy to change = done.

Gotchas

• Don't extract abstractions used only once — three similar lines is better than a premature abstraction.
• Don't add design patterns just to demonstrate knowledge.
• Don't rename things across the entire codebase without asking.
• Don't change public APIs without understanding downstream impact.
• Don't refactor and add features in the same change — separate commits/PRs.
• Don't refactor code that works, is clear, and is tested just because you'd write it differently.