Karpathy's viral second-brain idea: build a living wiki with Obsidian and Claude Code in 5 minutes
Roger_M_Taylor · x · 2026-09-06
Building on Andrej Karpathy's viral idea — stop using AI just to write code and use it to build a second brain — this thread lays out a concrete setup: point Claude Code at a folder, drop in articles, transcripts and PDFs, and let Claude file everything into a living wiki that compounds over time.
The 5-minute recipe: install Obsidian, open the vault in Claude Code, have Claude create raw/wiki folders plus a CLAUDE.md, drop sources into raw and say "ingest this", then query everything forever. No more starting from a blank chat.
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