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First launch prepares the local Harness service, then loads its Web interface in the desktop window. Stay online and keep the app open during downloads and verification.
1

Prepare dependencies

The desktop checks for compatible runtimes and downloads managed Node.js, pnpm, and a prebuilt Harness core when needed. Supported downloads can use regional fallback sources.
2

Choose optional presets

The guide offers six community presets. DSH Market, DSH Better Sidebar, and DSH Rewind are selected by default; deselect or skip them and install later through plugin management. See Plugins for the full list.
3

Open Harness

First installation creates and uses the tauri profile. The service listens locally by default, with http://127.0.0.1:3080 as its preferred address; it can use another available port if needed.
4

Configure a model

Add provider credentials in Harness Settings → Models, then select a model in the session and send a small test task.
First-run Harness core download progress

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Verify setup

The window should show the Harness session interface. Release builds enable CLI integration by default; open a new terminal and run:
The local service is not shared by default. For phone access, use Share at the top to enable authenticated LAN sharing or a public tunnel; see Mobile remote access. For another computer, see the Remote access plugin. Never expose an unauthenticated service directly to the internet.
See Troubleshooting if downloads or startup fail, or Configure a model for model setup.