Jack Dorsey’s Block Launches Buzz, an Open Source Workspace 

• Buzz is built with Nostr, an open protocol for signed messages and portable IDs.
• Each AI agent in Buzz gets its own cryptographic identity, apart from its owner.
• Buzz already supports Claude Code, Codex, goose, and other agent protocol tools.

Block, the company behind Square, Cash App, Afterpay, and Tidal, has launched a new workplace tool aimed at solving a problem many companies are now running into: AI agents that work fast individually but slow teams down collectively.

Jack Dorsey, Block’s co-founder, announced the product, called Buzz, on X, describing it as “model-agnostic, decentralized, self-sovereign, and open source.” The tool functions as a combined chat and code hosting platform, resembling Slack in appearance while adding native support for AI agents and GitHub-style project management inside the same window.

Why Block Built It

According to engineer Tyler Longwell, who wrote about the project’s origins, Block’s teams had been working with AI agents the same way most companies do, individually, inside separate harness windows, manually copying agent output into Slack and pasting responses back. 

“Nobody enjoyed being middleware,” Longwell wrote, describing how that setup made individual work faster while making teamwork slower, since every handoff required a human to shuttle context between tools.

Buzz is built with Nostr, an open protocol for signed messages and portable IDs. The platform bundles channels, search, automation, and Git hosting into a single shared space where people, agents, code repositories, and decisions all coexist. Buzz already supports Claude Code, Codex, goose, and other agent protocol tools, meaning teams can swap models or agent runtimes without losing a project’s history or permissions.

Giving Agents Their Own Identity

One interesting design choice addresses a common practice Longwell called “weird” and “dangerous,” handing AI agents human login credentials and hoping nothing goes wrong. Each AI agent in Buzz gets its own cryptographic identity, apart from its owner. The agent’s owner signs a narrowly scoped authorization, and the agent then signs its own work under its own identity, preserving a clear record of who authorized what.

If an agent’s key is ever compromised, teams can revoke that single agent without needing to replace the underlying human identity behind it.

Built for Machine-Scale Git Activity

Because AI agents can generate commits and CI runs far faster than human developers, Buzz stores Git repositories differently than traditional forges, using immutable, content-addressed packfiles paired with a single mutable pointer updated through a conditional compare-and-swap operation. The storage protocol was formally specified and model-checked using TLA+, a formal verification language, to confirm durability under concurrent pushes.

Part of a Broader Trend

Buzz isn’t the only attempt to rethink team collaboration around AI agents. Paradigm partner and CTO Georgios Konstantopoulos recently released a similar open-source tool called Centaur, described as a “virtual employee” that can run inside Slack or be accessed through an API. 

Writing about his own project, Konstantopoulos argued that enterprise teams will increasingly want to self-host agent tools for security and control while keeping them accessible inside existing chat platforms.

Since Buzz is fully open source, individual teams can inspect, modify, or self-host their own version of the platform, rather than depending on Block to operate the infrastructure long-term.

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