Refactor messy code without breaking it
By VibeCoderHQ|Published on 10/2/2025
PromptingAIClaude
For when a file has grown into a mess but you are scared to touch it. Best in Cursor or Claude Code. The plan-and-approve gate plus keeping the public interface identical means you get cleaner code without a surprise rewrite, and pairs well with writing tests first so you can prove nothing changed.
Prompt Text
Refactor [THIS FILE / COMPONENT / FUNCTION]. It works right now and I want it to keep working exactly the same. Do not add features or change behavior.
First, before changing anything:
1. Describe what this code currently does, step by step, so I can confirm you understand it.
2. List the specific problems (things like: too long, repeated logic, unclear names, deep nesting, mixed concerns, no error handling).
3. Propose a refactor plan as a short numbered list, from safest change to biggest. Wait for me to approve before you start.
Then refactor in small steps:
- Improve names, split long functions, remove duplication, and flatten nesting.
- Keep the public interface the same. Anything that imports this should not need to change.
- Do one logical change at a time and briefly say what you did after each.
- If you spot an actual bug, do not silently fix it. Point it out and ask.
At the end, tell me how I can quickly verify behavior is unchanged (a test to run or a flow to click through).Join the vibe coder community
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