Block launches Buzz, an open-source group-chat platform for people and AI agents

What's the deal? On 21 July 2026, Block — the company behind Square, Cash App, Afterpay and Tidal — launched BuzzDealroom has a profile for this one. Try Dealroom →, a new open-source group-chat and collaboration platform for teams of people and AI agents. Co-founder Jack DorseyDealroom has a profile for this one. Try Dealroom → announced it on X, describing it as “model-agnostic, decentralized, self-sovereign, and open source” and built to reduce dependency on Slack and GitHub.

What does it do? Buzz combines team chat, Git repositories, shared canvases, media, search, an audit log and YAML-based workflows behind a single identity system. It is built on a self-hostable Nostr relay, where every message, reaction, workflow step, code event and approval is stored as a cryptographically signed event — giving teams control of their own data. Human employees and AI agents receive the same identity structure, with their own key pairs, channel memberships and audit trails.

Agents as first-class members. 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, keeping the underlying model choice decoupled from the workspace.

Availability. Buzz shipped version 0.4.21 on launch day under an Apache 2.0 licence, with free desktop apps for macOS, Windows and Linux and the code published on GitHub. Block has not disclosed pricing, adoption numbers or external customers.

Read more: TechCrunch · X (@jack) · GitHub