Berd
Berd
Everything this guide has to say about Berd, gathered in one place. Berd is Block's other agent product: a private workspace on your own computer where one person works with agents, built by the same company as Buzz and meant to be used alongside it — start alone, then go multiplayer. Nothing here needs a relay, a keypair or a community; it all happens on your laptop.
If you have never opened Berd, start with the first card. If you are deciding where a piece of work belongs, start with the second.
Start here
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The agent you meet first. Shows you around Berd, takes on the work you would rather hand off, and notices when something you keep redoing should become a skill, an agent or an automation.
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The one rule for where work belongs, the words Berd uses and what they map to in Buzz, and the consequences for client material.
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The cast that ships with a fresh install: seven crafted personas and three starter agents, what each refuses to do, and when one agent is enough.
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How the agents hand off to each other
Strong pairings, pairings that need an explicit order, worked sequences, and the handoff formula. Routing is your job; this is how to do it.
The cast
Ten agents, each with a stated job and a boundary — described once, on Berd's built-in agents. Seven crafted personas: Berdy, Agt. Builder, Tinker, Wildcard, Choosey, Pushback and Copycat. Three starter agents: Generalist, Builder and Debugger.
Where Berd shows up elsewhere in the guide
- Where Buzz sits in the tool landscape — Berd as the solo tool beside Buzz, and why the boundary between them matters for client material.
- Map your method onto Buzz — deciding, stage by stage, which parts of the work are solo and belong in a private workspace.
- What a skill is — the same idea in both products: written instructions an agent picks up when the work calls for them.
- Create and configure an agent — the same role-first thinking, applied in Buzz.
- Which of Buzz, Goose or Craft Agents should I use for what? — the short answer on layers, with the Berd-specific consequences.
Two limits, by design
Berd stops where the agent's own machinery starts: it helps with the app around the agent, not with what a particular model or harness does internally. And a Berd conversation is a file on one laptop — nothing is signed, shared or kept for anyone else. The moment a second person needs to see, add to or point back at the work, it belongs in Buzz.
Maturity
Berd reached v0.6.2 on 2026-08-18, the day its source was made public. It is built by a small team at Block working in the open; bug reports are welcomed, outside code contributions are not accepted. The pages behind this one are verified against that release and carry their own stamp.
Reference
Verified against Berd v0.6.2 · Updated 2 Sep 2026