Second Brain marketplace

A Claude Code / Claude plugin that turns a folder of raw notes into a structured, interlinked second brain — the LLM-maintained wiki pattern.

This repo is both the plugin and a one-plugin marketplace, so it can be installed directly from GitHub.

What you get: the build-second-brain plugin

When you invoke it inside a folder (e.g. brain/) that contains a raw-notes/ subfolder, it:

1. Scaffolds the canonical second-brain structure (CLAUDE.md, HOME.md, index.md, hotcache.md, log.md, and projects/ / people/ / events/ templates) — byte-identical to the source schema, via a deterministic, idempotent script that never overwrites existing files.
2. Restructures your raw notes into pages — a project page per project, a person page per significantly-mentioned person, plus event / knowledge / idea pages — following the templates and frontmatter conventions.
3. Wires up the catalog (index.md), hot cache, dashboard (HOME.md), and op log so the wiki is self-consistent from day one.

Everything it needs is bundled inside the plugin — you start from an empty repo with only a raw-notes/ folder.

Install

In Claude (Cowork / desktop)

1. Open the Cowork tab → submenu → Add plugin.
2. Add this marketplace by its GitHub repo (karena408/create-second-brain-plugin).
3. Find build-second-brain in the plugin browser and install it.

In Claude Code (CLI)

# 1. Add this repo as a marketplace (GitHub owner/repo shorthand)
/plugin marketplace add karena408/create-second-brain-plugin

# 2. Install the plugin
/plugin install build-second-brain@second-brain-marketplace

Use

cd path/to/brain          # a folder containing only a raw-notes/ subfolder
# then, in Claude:
"Build my second brain from these notes."

The skill triggers automatically on phrases like "set up a second brain", "build an LLM wiki", or "organize my notes into a wiki".

Repo layout

build-second-brain-plugin/
├── .claude-plugin/
│   └── marketplace.json              ← marketplace manifest (lists the plugin)
└── plugins/
    └── build-second-brain/
        ├── .claude-plugin/
        │   └── plugin.json           ← plugin manifest
        ├── skills/
        │   └── build-second-brain/
        │       ├── SKILL.md          ← the skill (with the LLM-Wiki prompt inline)
        │       ├── scripts/
        │       │   └── scaffold.py   ← deterministic structure scaffolder
        │       └── assets/           ← canonical files copied into the brain repo
        └── README.md

License

MIT — see LICENSE.