What Buzz actually is
Buzz is a self-hostable desktop app (macOS, Windows, Linux) from Block (the company behind Square, Cash App, Afterpay, and Tidal). It looks and feels a lot like Slack—channels, threads, direct messages, reactions, media—but it also folds in GitHub-style project features: code patches, reviews, status updates, and automated workflows.
Under the hood it runs on a Nostr relay (a simple, decentralized messaging protocol that Dorsey has championed for years). Everything—chat messages, code changes, agent actions, approvals—is just a signed “event” in one shared log. You (or your company) run the relay yourself, so the data stays under your control.
Dorsey described it on X as “model-agnostic, decentralized, self-sovereign, and open source.” The code is on GitHub under the Apache 2.0 license, so anyone can inspect it, modify it, or host their own instance.
Why “for humans and agents” matters
Most workplace tools treat AI agents as second-class add-ons—bots that post messages or answer questions but don’t truly live in the same space with the same permissions and accountability.
In Buzz:
- Agents get their own cryptographic keys and identities, just like people.
- They join the same channels, leave the same audit trail, and can open repos, send patches, run workflows, review code, or even join voice huddles.
- Humans and agents can co-edit the same canvases, triage bugs together, or ask the project history questions and get answers with receipts (links back to the actual threads and events).
The tagline on the repo captures it cleanly: “People and agents building together in the same room.” Agents are “part of the room, not haunted cron jobs.”
This is especially useful as teams start using more autonomous AI tools (Block’s own earlier open-source agent framework, Goose, is designed to plug in here via an agent harness).
How it differs from normal Slack (and why self-hosting matters)
| Aspect | Typical Slack / Teams | Buzz |
|---|---|---|
| Who owns the data | The company (Salesforce etc.) | You (self-hosted relay) |
| Agents | Usually plugins or external | First-class members with same identity model |
| Customization | Limited by vendor APIs | Full source code, modify anything |
| Project work | Separate from GitHub/Jira | Git events + workflows live in the same event log |
| Model lock-in | Often tied to specific AI | Model-agnostic |
| Cost / lock-in risk | Subscription + data gravity | Free software + your own infrastructure |
Self-hosting and the Nostr foundation give it the “sovereign” property Dorsey likes: each community is defined by its relay URL. You can run a single private instance or more complex multi-tenant setups while keeping communities logically separate.
Bigger context and implications
Dorsey has spent years pushing open protocols and open-source tools (Nostr, Bitcoin-related work, Goose, various small vibe-coded apps). Buzz continues that pattern: instead of building another closed SaaS product, Block is releasing a substrate that others can run, fork, and improve.
Potential upsides:
- Cleaner human–AI collaboration without constant context-switching between chat, code hosts, and agent dashboards.
- Stronger security and privacy for teams that don’t want all their work conversations living on a third-party cloud.
- An audit trail that treats agents the same as people (useful for compliance or just understanding “who/what actually did this”).
- Community-driven improvements because the code is public.
Current realities and edge cases:
- It’s still early. The desktop app, relay, channels, search, Git events, and basic workflows work today; mobile apps, richer huddles, push notifications, and more polished workflow gates are in progress.
- Self-hosting requires some technical comfort (Docker, etc.). Not every team will want to run their own infrastructure.
- Network effects and existing integrations are Slack’s biggest moat; Buzz starts with zero of that.
- Like any open-source collaboration tool, success depends on whether enough people (and agent builders) actually use and contribute to it.
In short, Buzz is an experiment in making the workplace chat layer as open and agent-friendly as the rest of the modern software stack has become. It’s less “another Slack clone” and more “what if the place humans and AIs work together was something you actually owned, and the AIs were treated as real teammates instead of bolted-on bots?”