Build An AI Second Brain LLM Wiki Pattern With Claude Code And Obsidian — AI skill for Claude Code

Build an AI Second Brain with Claude Code

**Project Link:** [View Project](http://learn.nextwork.org/projects/ai-second-brain-claude-code)

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Introducing Today's Project!

In this project, I'm going to build a second brain using Claude Code and Obsidian to run oof the Andre Kapathy methodology. I will be learning about wikis, indexing and different queries to create my wn personal knowledge base for an LLM.

Key tools and concepts

Obsidian: A free note-taking app that uses plain Markdown files and provides a visual Graph View to see connections between ideas.

Claude Code: A command-line AI agent that can read, create, and edit files directly on your computer, acting as the "wiki maintainer."

Obsidian Web Clipper (Optional): A browser extension for saving web pages directly into the vault.

Concepts:

The Vault Architecture: The fundamental principle of separating a raw/ folder (your untouched source material) from a wiki/ folder (AI-compiled knowledge). This is called the "load-bearing rule" because keeping them separate ensures your original sources are never modified.

LLM Wiki Pattern: Andrej Karpathy's methodology of using an LLM as a "programmer" and Obsidian as the "IDE" for a knowledge base.

Schema-Driven Behavior: How a CLAUDE.md file acts as a constitution that the AI reads every session, defining project structure, page conventions.

Slash Commands as Primitives:

Knowledge Synthesis:

Challenges and wins

The project is estimated to take 60 minutes. From the tutorial, you would have spent this time on:

Installing and setting up both Obsidian and Claude Code.

Scaffolding the raw/ and wiki/ vault architecture.

Defining your CLAUDE.md schema and slash commands.

Exporting your existing data from other apps and converting it to Markdown.

Running your first /ingest cycle and ex