AI coding assistants are powerful, but they raise an interesting question: are developers slowly outsourcing their own skills? Atrophy is an open-source tool that analyzes your Git history to understand how you code — what you write yourself vs what AI might be generating. Instead of analyzing code quality, Atrophy analyzes developer behavior. It helps you see which skills you're exercising, which ones you're skipping, and whether AI is becoming a crutch.