The Second Brain by 02ui.com · @zerotoui — free and MIT licensed.
A blank, ready-to-use second brain. Download the folder, point Claude Cowork at it, and Claude can read, write, and organise everything inside — with a one-time onboarding that teaches it who you are.
Think of it as a new team member who already knows how you work and how you sound. You set that up once. After that, every session starts with Claude understanding you.
Open welcome.html in your browser. Double-click it — it opens like any web page and walks you through setup in about five minutes. Everything below is the short version.
- Download this folder and move it somewhere permanent (your Documents folder, not Downloads).
- Open Claude Desktop, go to the Cowork tab, and point a session at this folder.
- Say "run onboarding." Claude asks you a handful of questions and fills in the two foundation files for you. (Or open
about-me.mdandvoice-and-brand.mdand fill them in yourself.) - Start working. Drop ideas in
01-ideas/inbox.md. Ask Claude to "process the inbox" when you're ready.
second-brain/
├── welcome.html open this first, the full setup guide
├── README.md you are here
├── claude.md instructions Claude reads at the start of every session
├── ONBOARDING.md the one-time setup interview Claude runs for you
├── about-me.md who you are (blank, ready to fill)
├── voice-and-brand.md how you write and sound (blank, ready to fill)
├── 01-ideas/
│ └── inbox.md dump raw thoughts here, unsorted
├── 02-projects/ active work with a finish line
├── 03-areas/ ongoing responsibilities you maintain over time
├── 04-wiki/ evergreen knowledge you look things up in
├── 05-resources/ reference material you collect
└── 06-archive/ finished or paused work, out of the way
The folders are numbered so they sort in the order you actually use them: capture an idea, turn it into work, keep it running, build up knowledge, then archive what's done.
This brain ships blank on purpose. The first time you connect it, Claude notices the foundation files are empty and offers to set them up. Say yes (or say "run onboarding" any time) and it interviews you — your name, what you do, how you want to be spoken to, how your writing sounds — then writes about-me.md and voice-and-brand.md in your own words. That's the difference between a brain that knows you and a folder full of files.
Cowork lives in the Claude Desktop app (macOS Apple Silicon or Windows) on a paid plan (Pro, Max, Team, or Enterprise). It isn't on the free tier, web, or mobile.
Before Claude moves, overwrites, or deletes anything, it shows you its plan first. The template tells it to — but it's worth knowing.
MIT. Use it, change it, share it, build on it. See LICENSE.