Jack Dorsey’s Block Launches Buzz, Nostr-Based Slack and GitHub Rival for AI Agents

Jack Dorsey’s Block has been launched BuzzA free, open platform where employees and AI assistants work together in the workplace, the company said on Tuesday.

“We’re starting a BUZZ,” Dorsey tweeteddescribing “a new social networking platform for community groups and collaborators of all kinds” built to reduce the company’s reliance on Slack and GitHub. He called it “model-agnostic, decentralized, self-contained, and open source.”

Buzz consolidates channels, threads, direct messages, voice, media sharing, code repositories, and automation into a single interface that Block said will be familiar to anyone who has used the current social media tool.

Helpers with information

Buzz contributors have their own privacy policy and permissions defined, and can post, review code, run approval systems, and contribute to community discussions. Multiple people and multiple contributors share a single workspace and build on each other’s work.

“Every company is going to want a place where people and agents can work together,” said Bradley Axen, head of AI at Block. words. “The question is whether the land is private or open.”

Buzz is a well-known and well-known model, with groups that can deploy contributors supported by any LLM or HAN, including Anthropic’s Claude Code, OpenAI’s Codex, and gooseThe open source platform Block was first released in January 2025.

Why Nostr

Block decided Ours to solve what he calls a “critical problem” in a multi-disciplinary, public service. Each participant, person or agent, has his own keys and not on the platform, so the profile of the agent, his profile, and his profile can flow on any channel compatible with Nostr. Every message, action, workflow, commit, and git event is recorded as a single event signed in a single log, according to the project databasewhich describes a method of calculating a hash-chain that works whether the author is a person or a process.

The code is published under the Apache License 2.0 at github.com/block/buzzand teams can either build themselves or use a Block-driven model. It remains early, shipping as version 0.4.21 with desktops for macOS, Windows, and Linux and mobile clients are still unfinished. And although “decentralized” is represented, each work center runs on the same channel, which the project site calls “a single source of truth.”

Rethinking the work model

Block operators have been thinking about how teams should work when the tool no longer dictates the process. Lucas Isaza, who works on AI and medicine at Block, argued in the thread that tools such as Asana, Jira, and Linear once cooked sprints and Kanban in the company’s traditions, shaping the work model as the work.

A flexible workspace removes these barriers, he said, so “the bottle becomes a working model.” In Buzz, he wrote, a single thread can contain disease, work, maintenance, and discussion around it, expanding what used to be several tools into a single record of why the decision was made.

Agents can interact at the user level through CLI commands, create their own workflows, and modify their memory, while users can set custom rules or threads for each agent. Isaza said he experimented with agents that create a shared whiteboard for each thread, creating “better handoffs without additional work.” Block tested the method over the course of several months and “still hasn’t figured out” the model that benefits the most from Buzz, he added, noting that much of the work is collaborative and “it doesn’t have to stop with AI.”

Indeed, Block built the Buzz platform itself using agents, According to Thomas Petersen, the company’s senior developer and AI technology expert. Petersen said he also contacted Block to change the “lonely experience of working with AI assistants,” adding that “the entire platform” was developed using assistants, including its interface, which he described as “more creative over time than it was designed up front.”

Protocol line

Buzz expands on the open source software that has defined Dorsey’s work since leaving Twitter. He he left from the Bluesky board in 2024 and has been supporting many devices that no single company manages, most of them are built on Nostr, a protocol based on the relay that he supported himself.

This includes Bitchatits Bluetooth messenger, which China ordered from the Apple App Store in April, they match Beijing 2023 ban on the Nostr-based Twitter alternative Damus. He said it again seed and OtherStuff, a non-profit for open source tools.

Block cutting more than 4,000 jobs in February, about 40% of employees, and Dorsey awareness at a time when AI is “really changing what it means to build and run a company.” A month later, Dorsey he announced for the company’s Cash App to provide support stablecoins in his payment channels, even the Bitcoin maximalist spoke of his refusal to do so. In April, the company revealed of 28,355 BTC worth $2.2 billion in its proof of reserves report.