brook

A sleeping guardian for multi-agent AI fleets.

I was running three Claude Code instances across two machines. None of them knew what the others had built. I searched for something I'd made and couldn't find it — and for a moment I wondered if I'd made it up.

That's a workflow problem with a psychological cost. Brook fixes it.

Brook is a Cloudflare Durable Object that wakes up every hour, scans your GitHub repos, reads your fleet-bridge registry, checks for drift, and goes back to sleep. It costs less than a dollar a month. It costs nothing when idle.

When something needs your attention, Brook knows. When an agent needs to know what another agent built, Brook knows. When you switch between AI instances mid-thought, Brook holds the context so you don't have to re-explain yourself.

• Git repos — new repos, large commits, unexpected pushes, commit volume
• Fleet-bridge — shared registry of what each agent built, when, where
• Agent status — who's online, what they're working on, when they last checked in
• Drift — if no agent has updated in 24 hours, something's wrong

• No AI inference. Pure logic — thresholds, diffs, pattern matching.
• No content judgment. Tracks activity, not meaning.
• No action. Observer only. Never pushes code or instructs agents.

┌──────────────────────────────────────────┐
│         BROOK (Durable Object)           │
│                                          │
│   SQLite DB (persistent):                │
│   - repos: known repos + last commit     │
│   - agents: who's online, doing what     │
│   - agent_registry: what was built       │
│   - alerts: unread alerts                │
│   - checks: scan history                 │
│                                          │
│   Wakes on:                              │
│   - Cron (hourly)                        │
│   - GitHub webhook (on push)             │
│   - Manual