Local first
Your code stays on your machine. The cloud is opt-in, not default.
Mozart runs as a desktop app and reads your code from disk. Tasks, Workspaces, Agent Runs, and Changes all execute locally. Nothing is uploaded unless you ask.
What stays local
- Your Project files and Git history
- Workspaces and their diffs
- Threads with the Agent
- Mozart settings and preferences
What goes to the network
Two things only:
- Agent calls — the Agent sends prompts and code excerpts to its model provider (Claude). This is the same traffic you would generate using Claude Code directly.
- App updates — Mozart checks for new versions on launch. You can disable this in Settings.
That is all. Mozart does not telemeter your code, your file paths, or your Tasks.
The future cloud companion
app.mozart.build is a separate, opt-in surface for teams that want shared dashboards, deployed Tasks, or remote runs. It is not required to use Mozart and the desktop app works fully offline against your local Projects.
Why this matters
Local-first means:
- You can use Mozart on private repos without a security review
- Your work survives if a vendor disappears
- You stay in control of what leaves your machine
Next
If you have a team, see we are Mozart for community channels.