Legacy Modernizer - Safe Legacy Code Evolution

🎯 When to Use This Skill

Use when dealing with:

• Code written 5+ years ago
• No tests or documentation
• "Don't touch - it works" code
• Deprecated dependencies
• Security vulnerabilities in old code
• Performance issues in legacy systems

⚡ The Golden Rule of Legacy Code

NEVER refactor without tests! First make it testable, then make it better.

📋 The Safe Modernization Process