Characterization Test Generator

Generate tests that document what existing code actually does — not what it should do. These tests capture current behavior so you can refactor with confidence, especially when using AI to modify code.

When This Skill Activates

Use this skill when the user:

• Says "I need to refactor this" or "help me refactor"
• Wants to "add tests before changing code"
• Asks for "characterization tests" or "golden master tests"
• Says "I want to safely modify this class/module"
• Mentions "legacy code" or "untested code"
• Wants AI to refactor but is worried about breaking things

Why This Matters for AI-Generated Code