Selina

The "Karpathy Method" Obsidian + Claude Code is quietly replacing $15/month note apps for 1000s of builders. The setup costs $0. Takes 10 minutes. And it's stupidly simple. Karpathy stores his entire brain in plain markdown files. No Notion. No database. A folder. People mocked it for years. Then Claude Code shipped an agent that lives in the terminal and reads files natively. Obsidian IS files. Notion hides your notes behind an API. Obsidian hands them to the agent raw. The "boomer stack" turned out to be the only one AI can walk through end to end. The method, 4 steps: Open your vault folder in terminal. Type claude. The agent now sees 100% of your notes. Drop a CLAUDE.md at the root. 40 lines: how you tag, how you link, what a good note looks like. Your brain's operating manual. Run 1 nightly job. Claude reads the day's dump links, highlights, half-thoughts and files it into atomic notes with backlinks. Once a week, ask 1 question: "what connects that I haven't connected?" Old notes collide into ideas you'd never find alone. A builder running this loop hit 4,120 notes in 5 months. Found 2 essay ideas in the collisions. Sold both for $3,400. Hardware: a $599 Mac Mini. Software: a folder. The industry spent 10 years building smarter note apps. Karpathy bet on the file. The file won.