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ai-second-brain

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Walks the user through Charlie Hills's AI Second Brain + Karpathy Wiki setup from the MarTech AI newsletter. Use whenever the user mentions building an AI second brain, the Karpathy wiki, organising their ChatGPT/Claude exports in Obsidian, setting up a living wiki with Claude Code, connecting iMessage Channels, or installing the /today, /ideas, /create slash commands. Trigger on phrases like "set up my second brain", "build the Karpathy wiki", "follow Charlie's newsletter setup", "organise my AI conversations", "Obsidian + Claude Code setup", "I exported my ChatGPT data what now", or any reference to MarTech AI's Karpathy Wiki issue. Use even if the user only mentions one of the three steps (AI Brain, Karpathy Wiki, or Channels + slash commands).

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Oct 24, 2026
License
MIT

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# AI Second Brain Setup

This skill walks the user through the full setup from Charlie Hills's MarTech AI newsletter issue *"How to build a second brain with Obsidian and Claude Code"*. The process turns a folder of exports and raw research into a living wiki the user can talk to from their phone.

The setup has three steps. The user can do all three or pick one — confirm at the start which they want.

1. **AI Brain** — export ChatGPT and Claude history, organise it in Obsidian as tagged, linked markdown
2. **Karpathy Wiki** — set up `raw/` and `wiki/` folders with Karpathy's `CLAUDE.md` instruction file so Claude Code can compile a living wiki from raw research
3. **Living Wiki** — add MCP connectors (Gmail, NotebookLM, Granola), set up iMessage Channels, scaffold the `/today`, `/ideas`, `/create` slash commands

## How to use this skill

The user is most likely a non-technical newsletter reader. Many will be opening Terminal for the first time. Default to plain English, never assume CLI familiarity, and explain what each command does *before* running it.
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