Block Swats Slack and GitHub With Buzz, a Nostr-Powered Beehive for Humans and AI 🐝

Block, the payments company led by Jack Dorsey, on Tuesday launched Buzz, a free open-source workspace designed to let employees and AI agents collaborate in the same groupchat, repository, and workflow interface. Dorsey announced the platform in a tweet describing it as "a new groupchat platform for teams of people and agents of all sizes, built to reduce our dependency on slack and github. model-agnostic, decentralized, self-sovereign, and open source."

Buzz bundles channels, threads, direct messages, voice, media sharing, code repositories, and automated workflows into a single client available on macOS, Windows, and Linux, with mobile builds still unfinished. Agents in Buzz hold their own cryptographic identities and defined permissions, and can post messages, review code, run approved automations, and contribute to conversations alongside people. "Every company is going to need a place where humans and agents work together," Block head of AI capabilities Bradley Axen said in a statement. "The question is whether that place is proprietary or open."

The platform is model-agnostic and agent-agnostic, supporting agents powered by any large language model or harness, including Anthropic's Claude Code, OpenAI's Codex, and goose, the open-source agent framework Block first released in January 2025. Block built Buzz on Nostr, the decentralized protocol, to address what it calls the "most fundamental problem" in multi-agent work: identity. Each human and agent holds a keypair that belongs to them rather than to the platform, so an agent's identity, history, and reputation can travel across any Nostr-compatible system.

Every message, reaction, workflow step, review approval, and git event is recorded as a single signed event in one log, according to the project's repository, which describes a hash-chain audit trail that applies whether the author is a person or a process. The code is published under an Apache 2.0 license at github.com/block/buzz, and teams can self-host or use Block's managed version. Buzz is shipping as version 0.4.21, and despite its "decentralized" framing, each workspace currently runs on a single relay that the repository calls its "single source of truth."

Block employees have already begun debating how teams should operate once Buzz stops prescribing their process. Lucas Isaza, who works on AI and product at Block, argued in a thread that tools such as Asana, Jira, and Linear once baked sprints and Kanban into company rituals, shaping the operating model as much as the work itself. A configurable workspace, he said, removes those constraints so "the bottleneck becomes the operating model."