Second Brain

Second Brain is a Claude Code plugin that generates a local Markdown knowledge system with fixed defaults and a small starter tag registry.

Install from a release

Install Claude Code v2.1.129 or newer, uv, qmd v2+, Obsidian, and the Obsidian CLI. Then create an empty directory and start Claude Code with the latest release:

mkdir my-second-brain
cd my-second-brain
claude --plugin-url https://github.com/datamole-ai/arscontexta/releases/latest/download/second-brain.zip

Run /second-brain:setup. When setup finishes, restart Claude Code in the generated folder and open that folder as an Obsidian vault. Keep Obsidian running while you use the vault.

Use it

Add a source file to inbox/, then run one of these commands:

Command	Purpose
/process inbox/source.md --structure	Turn a source into distilled notes
/process inbox/source.md --capture	Preserve a source verbatim
/health	Check the vault