Second Brain

Use when the user wants to save durable knowledge, recall or connect their own notes, inspect knowledge gaps, manage a local personal wiki, exchange notes with Obsidian, or create and restore verified backups. Operates a local OKF Markdown knowledge graph with a rebuildable SQLite index.

7 starsProductivity & Notes

Install

skills CLI (Claude Code, Cursor, Codex and more)

npx skills add stancsz/second-brain --skill second-brain

Manual install

git clone --depth 1 https://github.com/stancsz/second-brain.git /tmp/second-brain
mkdir -p ~/.claude/skills
cp -r /tmp/second-brain/. ~/.claude/skills/second-brain

Personal skills live in ~/.claude/skills. Use .claude/skills in a project folder to share a skill with your team.

From the SKILL.md

# Second Brain

Use the user's local notes as durable memory across conversations. Markdown in the OKF Bundle is canonical; SQLite is a rebuildable index. Supported CLI/MCP writes are paired to the Bundle with a lock, receipt, and crash-recovery journal. Never substitute model memory or general web knowledge for a requested search of the user's brain.

## Locate the tools

Treat the directory containing this file as `<skill_root>`.

- Brain CLI: `<skill_root>/scripts/brain_cli.py`
- Snapshot CLI: `<skill_root>/scripts/storage_cli.py`
- MCP server: `<skill_root>/scripts/brain_mcp.py`

Use `SECONDBRAIN_CLI` instead when it is set. Run with an available Python 3 interpreter (`python3` or `python`). Do not guess a host-specific install path.

Global flags precede the subcommand:

```text
python <skill_root>/scripts/brain_cli.py --json search "query"
```

If a command is unclear, run that command with `--help` rather than inventing an option.

## Match intent to action

| User intent | Action |
|---|---|
| Save or remember one item | `add` one concise Concept. Infer a useful title and 2–5 tags; do not block on taxonomy. |
| Recall their knowledge about a topic | `search`, inspect the best results with `show`, then answer with Concept IDs. |
| Catch up on a project | `list --collection <project> --sort updated`, inspect the strongest notes, and use `related` when connections matter. |

Read the full skill on GitHub

Details

Skill name: second-brain
Repository: stancsz/second-brain
License: MIT
Repo updated: 28 October 2026

FAQ

What does the Second Brain skill do?

How do I install the Second Brain skill?

skills CLI (Claude Code, Cursor, Codex and more): npx skills add stancsz/second-brain --skill second-brain. Skills go in ~/.claude/skills (personal) or .claude/skills (project), and Claude loads them automatically when a task matches the description.

Is Second Brain popular?

It lives in stancsz/second-brain, which has 7 GitHub stars and 0 forks.

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