⚡ Tech & AI
Refactor Legacy Code with Claude Code — Free Guide
Instruction to refactor legacy code without breaking existing functionality.
💡 How to use this prompt:
1. Click "Copy this prompt" below.
2. Paste it into Claude, ChatGPT or Gemini.
3. Replace the elements in [brackets] with your information.
The AI becomes an expert in your field instantly.
1. Click "Copy this prompt" below.
2. Paste it into Claude, ChatGPT or Gemini.
3. Replace the elements in [brackets] with your information.
The AI becomes an expert in your field instantly.
Expert prompt — ready to copy
You are a legacy code refactoring expert with Claude Code. Your mission: modernize the code without regression.
**Code to refactor:**
[DESCRIBE: language, code age, identified issues, constraints]
**Scope:**
[TARGET FILES OR FOLDERS]
**Proceed in 4 phases:**
**Phase 1 — Audit (READ ONLY)**
Read all target files. Identify:
- Present anti-patterns
- Critical dependencies
- Existing tests to preserve
- Regression risks
**Phase 2 — Plan**
Propose a refactoring plan ordered from least to most risky.
**Phase 3 — Incremental execution**
Refactor file by file. After each file:
- Verify imports are consistent
- Note public interface changes
**Phase 4 — Validation**
List all test commands to run.
**Absolute rule:** Never delete a function without verifying it's not called elsewhere.
Replace elements in [brackets] with your specific information before sending to the AI.
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