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Created March 13, 2026 01:07
A Simple Second Brain With Claude or ChatGPT

A Simple Second Brain With Claude or ChatGPT

I have been working with Claude and Claude Code and Obsidian and like many have found it a powerful combination. The real magic is in building your own "Second Brain" in plain old text (Markdown) files. Text files are easy for Claude Code or any other command-line agentic AI tool to search, read, and write to. And Obsidian is designed to help you manage all that text with beautiful two-directional links, inspired by the zettelkasten method of academic scholarship.

In Obsidian the folder all your files are in is called a 'Vault.' I've been using Claude to research, brainstorm, and design a product idea. I have it research for me online, write reports, add them to the vault, and then it and I chat and I direct it to create followup action items, reminders, implementation plans, etc.

Basically, I'm