Claude Code + Obsidian: Build a Second Brain That Actually Thinks

Obsidian stores notes as plain Markdown files on local disk, and it has no API or proprietary format.

The guide is for developers, researchers, and knowledge workers who want Claude Code to work in an Obsidian vault.

Claude Code can be installed on macOS, Windows, or Linux, then verified with `claude doctor` and signed in with `claude auth login`.

It needs a Claude Pro ($20/mo) or Max subscription, but the integration does not require plugins, API setup, or tokens.

Create `~/second-brain`, open it as a vault, then run `cd ~/second-brain` and `claude`; `/init` can generate a starter `CLAUDE.md`.