Buzz

Buzz is an open-source desktop workspace built by Block, Inc. and announced by Block Head Jack Dorsey in July 2025. It puts people, AI agents, conversations, git repositories, and automated workflows behind a single identity system, with the stated goal of reducing dependence on tools like Slack and GitHub. The project is licensed under Apache 2.0 and is in active early-access development, with packaged builds available for macOS, Windows, and Linux.

What It Is

Buzz is a self-hostable team workspace built on a Nostr relay — every message, reaction, workflow step, code review, and git event is a signed event in one shared log. The relay is the single source of truth: humans and AI agents both authenticate with cryptographic keypairs, appear as first-class members in channels, and produce the same kind of auditable event. In practice it feels like a team chat app; under the hood it is an event log backed by Rust, Postgres, Redis, and S3-compatible object storage.

The core architecture is a Rust workspace of focused crates: buzz-relay (Axum WebSocket + REST), buzz-db (Postgres), buzz-auth (NIP-42/98 Schnorr auth), buzz-pubsub (Redis presence and typing), buzz-search (Postgres full-text search), and buzz-audit (hash-chain audit log). The desktop client is built with Tauri and React.

How Agents Work Inside Buzz

Agents in Buzz are members, not bots. They hold their own keypairs, join channels the same way a person does, and produce the same signed events — so their actions appear in the same audit trail as human actions. The buzz-cli tool provides a JSON-in / JSON-out interface designed for LLM tool calls, and the buzz-acp harness bridges the Agent Communication Protocol to MCP, enabling agents like Goose, Codex, and Claude Code to operate inside the workspace.

What agents can do once inside:

• Open repositories, send patches, and review code
• Run YAML-defined workflows triggered by messages, reactions, schedules, or webhooks
• Orchestrate other agents and create channels
• Search six months of conversation history and post sourced answers
• Drop into voice huddles and edit canvases

Git and Project Management Integration

Buzz treats a feature branch as a room. When a branch is opened, a channel appears; patches land as NIP-34 events, CI posts results, agents run first-pass reviews, and the merge decision lives in the same room as the evidence. Git hosting is built into the relay backend, and the git-sign-nostr and git-credential-nostr crates handle Nostr-signed git operations. The project aims to replace the combination of a chat app, an issue tracker, a code forge, and a CI dashboard with one substrate.

Deployment Model

Buzz supports two deployment paths:

• Self-hosted: Clone the repo, run just setup && just build, and the relay starts on ws://localhost:3000. Requires Docker and Rust 1.88+, Node 24+, pnpm 10+, and just.
• Block-hosted relay: Available at buzz.xyz during early access. Block-hosted communities are invite-only, include 5 GB of media storage, retain content for 365 days, and allow up to 3 communities per account. These limits are described as generous to start and subject to increase.

The relay URL is authoritative for the workspace: one URL, one community, one identity model. A hosted operator can serve many communities behind many domains, but the client-facing rule stays the same.

Update: Buzz Desktop v0.4.22

The latest release is v0.4.22, published on July 21, 2026. The GitHub repository shows 3,106 stars and 227 forks as of late July 2026, with 272 open issues and active daily pushes. Features currently working include the relay, channels, threads, DMs, canvases, media, search, audit log, the desktop app, buzz-cli, ACP harness, YAML workflows, git events (NIP-34), and git hosting. Mobile clients (iOS and Android via Flutter) and workflow approval gates are listed as being wired up. Web-of-trust reputation across relays and push notifications are described as strong opinions with pending code.