State the refactoring goal
Name specifically what should improve — readability, performance, structure — not just "clean this up."
SAFE REFACTOR PROMPT
Refactoring Prompt Builder
Define the goal, boundaries, and verification steps for a behavior-preserving refactor before handing it to an AI coding agent.
- Uses your inputs in a transparent calculation
- Instant result with practical next steps
- No signup required
Planning guidance only. Validate important decisions with customer evidence and your delivery team.
YOUR INPUTS
Build your result
Complete every field. The result updates only when you choose Calculate.
How it works
Set boundaries
Declare what must NOT change: public API, behavior, output format, or files outside scope.
Define verification
Pick a concrete way to confirm behavior stayed the same — existing tests, a diff, or a manual check.
Continue learning: Refactoring safely with AI coding agents
Frequently asked questions
Why does a refactor prompt need boundaries?
Without explicit boundaries, an AI coding agent has no way to distinguish "improve this" from "also change whatever else looks improvable while I'm here" — which is how small refactors turn into large, unreviewable diffs.
What counts as a good verification step?
Anything that produces a concrete before/after comparison — running the existing test suite, diffing output on sample inputs, or a specific manual check. "It looks fine" is not a verification step.
Should I refactor without any existing tests?
It's higher risk. Consider adding a minimal test around the current behavior first, so you have something to verify against after the refactor.
How is completeness scored?
Each of the three sections is checked for at least 10 characters of real content; the score is the percentage of sections that pass.
How We Compare
| Feature | MVPHub | GitHub Copilot | Cursor |
|---|---|---|---|
| Structured goal/boundary/verification prompt | Included | Not included | Not included |
| Completeness scoring | Included | Not included | Not included |
| No account required | Included | Not included | Not included |
| Defines explicit no-change boundaries before execution | Included | Not included | Not included |
Copilot and Cursor execute the refactor once you give them a prompt. This tool helps you write a prompt with explicit boundaries and verification, so the executed refactor stays behavior-preserving.
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