Captures your decisions and their reasoning as you make them, storing everything in structured markdown files. You'd reach for this when leading a project where you need to explain later why you chose option A over B, or when working solo and want to remember what you were thinking six months from now. The format is simple: decision title, context, what you picked, what you didn't, and why. Honestly more useful than it sounds at first. The discipline of writing down your reasoning tends to improve the decisions themselves, and having a searchable history beats trying to reconstruct your logic from commit messages and Slack threads.
npx skills add https://github.com/alirezarezvani/claude-skills --skill decision-logger