# LLM Wiki: Build Your AI Second Brain

A step-by-step guide to building a personal knowledge base out of plain markdown files, using Claude Code to ingest clipped articles into an Obsidian vault that links new material to what exists.

The guide walks through creating an Obsidian vault with a raw folder for source material, installing the Obsidian Web Clipper to save articles directly into that folder, and opening the vault in Claude Code so it can build a CLAUDE.md schema, an index and a log file. A single prompt tells Claude Code to act as an LLM Wiki agent and set up the vault's structure, based on an idea originally described by Andrej Karpathy.

Ongoing use is a short loop: clip or drop a new source into the raw folder, tell Claude Code to ingest it, and it creates linked wiki pages and updates the index, viewable as a graph in Obsidian. The approach uses no vector database or other infrastructure, only markdown files that accumulate structure over time, and includes a prompt for running a health check that finds gaps and unlinked entities.

Website: https://github.com/julianoczkowski/karpathy-llm-wiki