Build an AI Second Brain with Claude + Obsidian — Karpathy's LLM Wiki Method (Full Guide)
Your best ideas are scattered across notes apps, browser tabs, and Claude chats you'll never find again. A second brain fixes that: one place that holds everything you know, with Claude reading it, linking it, and getting smarter every single day. This is the full build — Claude + Obsidian — based on Andrej Karpathy's "LLM Wiki" pattern. Every click and command spelled out, even if you've never opened Claude Code or Obsidian.
We build it in 3 layers + 1 rule:
• Layer 1 — STORAGE: a plain-text Obsidian vault you own forever
• Layer 2 — THE BRAIN: Claude Code reading, linking & growing it (MCP)
• Layer 3 — AUTOPILOT: it files itself overnight with Routines
• THE RULE: keys, not prompts (the one thing you never break)
⏱️ Tip: this is a dense walkthrough — watch at 1.25–1.5x if you like a faster pace.
📘 FREE — The Second Brain Build Checklist (every command + every copy-paste prompt):
Comment WIKI and we'll send it, or grab it here → https://hyperautomationlabs.co/free/s...
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🔗 Tools & repos shown (all verified):
• Obsidian — https://obsidian.md
• Claude — https://claude.com/download
• Obsidian Local REST API — https://github.com/coddingtonbear/obs...
• mcp-obsidian — https://github.com/MarkusPfundstein/m...
• workspace-mcp — https://github.com/taylorwilsdon/goog...
• Karpathy's "LLM Wiki" gist — https://gist.github.com/karpathy
Ready-made second brains: AgriciDaniel/claude-obsidian · eugeniughelbur/obsidian-second-brain · coleam00/second-brain-starter
⏱️ Chapters
0:00 Your ideas are scattered
0:30 Why a second brain compounds
0:54 Where this came from: Karpathy's LLM Wiki
1:26 The map: 3 layers + 1 rule
1:49 Layer 1 — Storage (Obsidian)
2:21 Make your vault + the [[link]] mechanic
2:50 Layer 2 — The Brain (Claude Code)
3:19 Connect Claude to your vault (MCP)
4:08 Load yourself in (CLAUDE.md)
4:39 Projects with the right structure
5:21 Build a skill (stop repeating yourself)
5:52 Layer 3 — Autopilot (live data)
6:32 Put it on Routines (7am autopilot)
7:02 The one rule: keys, not prompts
7:33 Skip the setup: 3 ready-made repos
8:15 Why it compounds
8:39 Free checklist + go deeper
#ClaudeCode #Obsidian #SecondBrain #AI #Karpathy #LLMWiki #Anthropic #PKM #Productivity