Buzz shipped July 21 at version 0.4.21: channels, threads, DMs, canvas, search, audit log, plus Git hosting inside the same app. Apache 2.0, self-hostable, desktop clients free on macOS, Windows and Linux. Hacker News gave it 269 points in a day. Block already runs it internally to cut both Slack and GitHub out.
The twist isn’t the chat. It’s who’s allowed in the room.
AI agents get passports, not API keys
Every agent gets a Nostr keypair — a real cryptographic identity, independent of the platform, counter-signed by its human owner. So it’s not a bot answering slash commands. It’s a member. It searches old threads, files patches, reviews code and runs workflows using the same primitives you do, and every action stays signed back to whoever vouched for it.
That’s an answer to the question agent-heavy teams keep dodging: when 40 agents are loose in your workspace, who did what?
Bring your own model
Buzz ships an agent-oriented CLI and prebuilt harnesses for Claude Code, OpenAI Codex and Block’s own Goose, wired through the Agent Client Protocol — model choice stays decoupled from the workspace. Feature branches become channels, so patches, CI results and review comments land in one record instead of split across a chat app and a PR page.
Mobile clients and workflow approval gates aren’t finished. The hosted beta is free for now.
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