A free, open-source company knowledge system for Claude.
Point Claude at this folder and it becomes a company brain that reads, writes, and organises your team's knowledge — decisions, projects, processes, people. No accounts. No API keys. No configuration beyond Claude Desktop.
Free forever · MIT licensed · Made by Index Brain
Every session, Claude reads brain.md and loads the context from company.md and brand.md. It knows who you are, what you're building, and how you communicate — without you explaining it again.
Drop raw thoughts into capture/inbox.md throughout the day. When you're ready, say "process the inbox" — Claude groups, cleans, and files everything into the right folder, showing you the plan before touching anything.
Decisions get their own folder. Projects live in active/ until they're done, then move to archive/. The team roster lives in team/. Nothing gets deleted.
- Claude Desktop — macOS Apple Silicon or Windows
- A paid Claude plan — Pro, Max, Team, or Enterprise
- Nothing else
1. Download Click Code → Download ZIP, unzip it, move the folder somewhere permanent.
2. Connect Open Claude Desktop → Cowork tab → point a session at this folder.
3. Set up Say "set up the brain". Claude asks about your company — name, team, focus, communication style — and fills in the two core files. Takes about 5 minutes. Everything is skippable.
4. Work
Drop notes in capture/inbox.md. Say "process the inbox" to file them. Ask Claude anything about your company and it answers from the files.
melina/
├── brain.md instructions Claude reads every session
├── SETUP.md the one-time company setup Claude runs for you
├── company.md who you are — team, stage, current focus
├── brand.md how your company sounds and writes
├── capture/
│ └── inbox.md raw input — dump anything here, unsorted
├── active/ projects currently in progress
├── decisions/ every decision made, with reasoning, dated
├── knowledge/ things the team looks up — processes, how-tos
├── library/ reference material and links
├── team/
│ └── roster.md who's on the team and what they own
└── archive/ finished and paused work — nothing deleted
capture/inbox.md ← drop anything here, any time
│
│ "process the inbox"
▼
Claude groups and cleans the notes
│
├──► active/ if it's a project or active task
├──► decisions/ if a decision was made
├──► knowledge/ if it's something to look up later
└──► library/ if it's reference material
Claude shows the plan before filing anything. You confirm, then it moves.
Most systems treat a decision like any other note. This one doesn't.
Every decision goes in decisions/ with a dated filename — decisions/2026-06-29-chose-stripe.md — and includes what was decided, why, what was considered and rejected, and who was involved.
Six months later when someone asks "why did we go with Stripe?" — the answer is in the file.
| File | What it does |
|---|---|
company.md |
Who you are — company, team, stage, what's active right now |
brand.md |
How you sound — writing style, tone, words you never use |
Fill them once during setup. Update them whenever things change — just tell Claude and it edits the file directly.
team/roster.md tracks who's on the team and what they own. When you mention a new hire or role change, Claude updates the roster and confirms. Ask "who owns X?" and Claude checks here first.
Claude never moves, overwrites, or deletes a file without showing you exactly what it's about to do and waiting for your confirmation.
MIT. Use it, fork it, build on it. See LICENSE.
Made by Index Brain