Jack Dorsey's Block released Buzz on July 21, 2026, an open-source workspace that combines team chat, Git repositories, and AI agents behind one identity system. The launch positions Buzz as a direct alternative to Slack and GitHub for software teams whose workflows now depend on autonomous agents alongside human employees. Version 0.4.21 shipped the same day with desktop builds for macOS, Windows, and Linux, released under an Apache 2.0 license.
Dorsey announced the project on X, describing Buzz as an effort to reduce Block's own dependency on Slack and GitHub. Block, which also operates Square, Cash App, Afterpay, and Tidal, published the codebase publicly and is running Buzz internally as the first customer reference.
“model-agnostic, decentralized, self-sovereign, and open source.”— Jack Dorsey, Block co-founder
The product's core architectural bet is Nostr. Every message, reaction, workflow step, code event, and approval is stored as a cryptographically signed Nostr event. Human employees and AI agents receive the same identity structure — their own key pairs, channel memberships, and audit trails — which lets agents act as accountable members rather than bolted-on chat bots.
Key facts
- 01Block launched Buzz on July 21, 2026, an open-source workspace merging chat, Git hosting, and AI agents into a single Nostr-signed system.
- 02Version 0.4.21 shipped the same day with desktop builds for macOS, Windows, and Linux under an Apache 2.0 license.
- 03Buzz includes agent harnesses for Goose, Codex, and Claude Code, keeping model choice separate from the workspace.
- 04Every message, code event, and workflow step is stored as a cryptographically signed Nostr event, though each workspace runs on a single centralized relay.
- 05Buzz competes with Paradigm CTO Georgios Konstantopoulos's Centaur, an open-source Slack-native agent unveiled May 21, 2026.
Per Block's documentation, agents inside Buzz can search prior discussions, open repositories, submit patches, review code, run workflows, edit shared canvases, and create channels. The platform ships with an agent-oriented command-line interface and pre-built harnesses for Goose, Codex, and Claude Code, meaning the underlying model choice stays decoupled from the workspace itself.
The Git integration goes deeper than typical chat-to-repo notifications. Buzz includes a built-in software forge using standard Git Smart HTTP, where a feature branch can become its own channel — patches, continuous-integration results, review comments, and merge decisions all preserved in the same signed record. Repositories, discussions, and workflow history share a single search index.
Buzz enters a category that's suddenly crowded. Paradigm partner and CTO Georgios Konstantopoulos unveiled Centaur on May 21, 2026, another open-source project aimed at putting agents inside Slack rather than replacing it.
Dorsey framed Buzz as decentralized and self-sovereign, but Block's own architecture document is more precise. Buzz has no peer-to-peer event exchange, no gossip layer, and no replication between relays. All reads and writes in a workspace flow through a single relay that authenticates users, verifies signatures, and distributes updates. The decentralization is at the deployment layer — any organization can run its own relay and retain its data — not at the network layer.
That distinction matters for teams evaluating Buzz against Slack or GitHub. Self-hosting shifts control over infrastructure and data location to the operator, but also transfers responsibility for availability, backups, and upgrades. The signed-event model provides attribution and an audit trail; it does not eliminate the operational burden of running the server.
Block's documentation repeatedly labels the product unfinished. Mobile clients are still in development, push notifications are pending, and workflow approval gates have database, API, and interface pieces without a completed execution path. The working feature set covers channels, threads, direct messages, shared canvases, media, search, an audit log, the desktop app, and YAML-based workflows. Block has not published adoption numbers, pricing, or any external customer names.
Buzz's scope is the risk. Block is asking one event system to replace portions of chat, code hosting, workflow automation, project search, and agent orchestration simultaneously. Consolidation may reduce the integration work required to give agents useful context and tightly scoped permissions, but it also means Buzz has to compete against mature specialized tools whose separation is a feature — customers can swap Slack without migrating GitHub, or vice versa.
The strategic question is whether agent-native workspaces will become their own product category or whether Slack, Microsoft Teams, and GitHub will absorb the same capabilities before challengers reach scale. Dorsey is betting that identity and cryptographic accountability are the wedge — that once agents commit code, approve merges, and hold budget, treating them as first-class signed participants rather than webhook integrations becomes a hard requirement. If he's right, the incumbents' bolt-on approach ages badly. If he's wrong, Buzz becomes another well-designed developer tool in a market that keeps consolidating around the platforms teams already pay for.
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