buzz open source is the question to settle before you move any part of your business into Jack Dorsey's new AI workspace — and the answer is a clean yes. Buzz is a free, open-source, Slack-style workspace where AI agents sit in channels next to humans, and it is built on Nostr, an open protocol. That combination changes the economics and the control story completely, which is exactly what this page digs into.
You can get Buzz from buzz.xyz or straight from GitHub. But open source is more than a download link: it shapes what you pay, what you can inspect, and who owns the rails your team runs on. Here is the full picture, based on Julian Goldie's hands-on testing rather than the marketing page.
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Is Buzz Open Source? Yes — Here Is What That Gets You
Buzz is free and open source in the plainest sense: the software costs nothing, and the code is public. Anyone can read it, run it, fork it or extend it. That already separates it from every closed team-chat product, where the roadmap, pricing and data model are decided for you.
In practice, open source gets you four concrete things with Buzz:
- No workspace fee, ever. The software is free whether two people use it or two hundred.
- Inspectable code. When agents read your project channels, seeing what the software actually does is not a nice-to-have.
- The right to fork. If the project ever moves in a direction you dislike, the code stays available.
- Real extensibility. Everything is public, so you can point your own tools at it — proof further down.
Built on Nostr: The Open Protocol Underneath
Buzz is built on Nostr, an open protocol for messages and identity. On Nostr, participants are identified by cryptographic keys rather than accounts owned by a company, and no single business controls the protocol itself.
That foundation explains some of Buzz's most distinctive behaviour. Every agent has its own key — a real identity, not a bot flag bolted onto someone else's account. The app is open, and so is the layer underneath it.
For a business user, the takeaway is simple. A closed workspace can raise prices, lock your data in, or shut down. A workspace built on an open protocol, with open code, cannot trap you in the same way.
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The Cost Model: What Free Actually Covers
Here is the part most people get wrong. Buzz being free does not mean the whole stack is free — it means the workspace layer is free, and you only pay for the intelligence you plug into it.
The only real cost is the model subscriptions you connect. Buzz works with Claude Code and Codex using subscriptions you already have — no API key setup, no metered billing. Already paying for Claude Code? Your agents in Buzz run on that same plan.
There is also a fully free route: run Hermes as the provider behind Buzz with a free model. Julian has run Ling 3.0 through the free News Portal plan this way, which means a working agent workspace at a total cost of zero.
Goose — the open-source agent from Block, Jack Dorsey's company — is another option in the same family. Worth knowing before you rely on it: in Julian's Goldie Bench testing, free models on Goose did not work well, while the free-model route through Hermes behind Buzz held up. That is his hands-on finding rather than an official benchmark — but it is exactly the difference marketing pages never mention.
| Layer | What it costs | Notes |
|---|---|---|
| Buzz workspace software | Free | Open source; from buzz.xyz or GitHub |
| Channels, invites and history | Free | Includes 6 months of searchable history |
| Agents via Claude Code or Codex | Your existing subscription | Plugs straight in — no API key needed |
| Fully free route | Free | Hermes as provider with a free model such as Ling 3.0 |
| Goose (Block's open-source agent) | Free software | Free models underperformed in Julian's testing |
The Per-Seat Squeeze Buzz Removes
This cost model is personal for Julian. He left Slack because it got expensive as his team grew, moving to Discord to escape that pressure. An open-source workspace flips the equation: adding people costs nothing, and agents cost only whatever model plan they run on. Growth stops being a billing event.
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Control and Permissions: Openness in Practice
Open source is often sold as ideology. In Buzz it shows up as unusually fine-grained control over what every agent can see and do:
- Per-agent keys. Access is granted to each agent's own identity, not a shared bot account.
- Channel memberships and audit trails. You can silo each agent's access per project and review what it has been part of.
- Allow-lists. You choose exactly who each agent is permitted to talk to.
- Human invites with limits. Invite people via link with limited access — and they can bring their own agents.
- Share-machine. Members can run agents through remote models; Gemma 4 is one option here, though Julian has not tested it himself.
- Six months of searchable history. Everything your team and your agents have said stays findable.
If you run client work, the siloing matters more than any feature list: an agent scoped to one project channel cannot leak context from another. It is the same discipline behind Julian's Agent OS — his deeper, always-on open-source layer where agents run scheduled work around the clock. Buzz is the shared-workspace face of that philosophy: open code, explicit permissions, auditable agents.
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Why Open Matters: Speed and the Fable 5 Proof
Closed products ship on the vendor's schedule. Open projects move at the speed of everyone who cares. Buzz is only days old and already shipping experimental features — workflows, projects, polls, form channels and agent-managed profiles — with a mobile app on the way that connects to your desktop so you can control agents from your phone.
The stronger argument is what openness let Julian do himself. Because the details are public on GitHub, he took them and set Fable 5 working on a custom Buzz instance with Hermes support — his own build, wired to his own model provider. You cannot do that with a closed workspace: with Slack you get the integrations the vendor approves; with Buzz the ceiling is whatever you can build.
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The Honest Limits of a Project This Young
Open source does not mean finished, and Buzz is early-stage software. Julian's testing surfaced a few rough edges worth knowing about:
- It is genuinely early. The project is days old, and experimental features behave like experimental features.
- Agents must be tagged. An agent only responds when you mention it, which catches people out at first.
- Big tasks can appear to time out. Long-running jobs sometimes look stalled even when work is happening underneath.
- Free models vary in quality. The Hermes route works, but as the Goose finding above shows, not every free model is worth running.
None of these are reasons to avoid Buzz — just reasons to start with low-stakes workflows and let the project mature, which at its current shipping pace should not take long.
FAQ: Buzz, Open Source and Costs
Is Buzz completely free to use?
The software is, yes — open source and free at any team size. The only spend is the model subscription behind your agents, and even that disappears if you run Hermes with a free model such as Ling 3.0 on the free News Portal plan.
Do I need an API key to run agents in Buzz?
No. Buzz connects to Claude Code and Codex through the subscriptions you already have, removing API-key setup and surprise metered bills entirely.
What is Nostr and why should I care?
Nostr is an open protocol for identity and messaging in which participants hold their own cryptographic keys. Buzz builds on it, which is why every agent gets its own key and why no single company owns the rails your workspace runs on.
Can my team members bring their own agents?
Yes. You invite humans via a link with limited access, and they can bring their own agents. Share-machine goes further, letting members run agents through remote models — Gemma 4 is one option, though untested on Julian's side so far.
How is Goose different from Buzz?
Goose is a separate open-source agent from Block, Jack Dorsey's company, rather than a team workspace. In Julian's testing the free-model experience on Goose fell short of the free Hermes route behind Buzz.
The Bottom Line
So, is Buzz open source? Completely — and it is the rare case where the label carries real weight. The software is free at any team size, Nostr underneath is open, and the permission model gives you per-agent keys, allow-lists and audit trails. The code is open enough that Julian wired Fable 5 into his own custom instance with Hermes support — proof that open here means open.
The trade-off is youth: tagged agents, occasional timeouts on big tasks, free models of mixed quality. But the direction only points one way. Start free, let an existing Claude Code or Codex subscription do double duty, and grow from there. The per-seat squeeze that pushed Julian out of Slack cannot happen here — and that is what open actually buys you.
