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DeepSeek Harness (dsh) is an open-source agent harness developed by DeepSeek AI.
It uses an architecture where everything is a plugin, and is powered by Cordis, whose design is described in A Programming Paradigm for Spatiotemporal Composability.
DeepSeek Harness is currently in developer preview and is iterating rapidly. THERE WILL BE COMPATIBILITY-BREAKING CHANGES.
This fork adds a desktop build of the same Web UI. Download it from Releases — it carries its own runtime, so nothing has to be installed first.
| Artifact | Use |
|---|---|
DeepSeekHarness-Setup-<version>-x64.exe |
Installer: choose a directory, get Start-menu and desktop shortcuts, uninstall from Settings. |
DeepSeekHarness-<version>-win-x64.zip |
Portable: unpack anywhere and run DeepSeek Harness.exe. |
The build is unsigned, so Windows SmartScreen interrupts the first launch: choose More info → Run anyway.
Open the Models page on first use and paste a DeepSeek API key. It is stored in %USERPROFILE%\.dsh\.credentials.yaml, the same place the dsh command line reads, so both surfaces share one key. Sessions open in Documents\DeepSeek Harness unless DSH_DESKTOP_WORKSPACE names another directory.
The desktop package has no terminal tool: its persistent-terminal backend is a compiled module the cross-built package does not carry. Ordinary shell commands, file editing, skills, and web search all work. apps/desktop documents the shell and how to build the package yourself.
Install Node.js, then run:
npx @deepseek-ai/dsh webThe command starts the Web UI, served at http://127.0.0.1:3080 by default. See Web UI guide.
To run from a repository checkout:
git clone https://github.com/deepseek-ai/deepseek-harness.git
cd deepseek-harness
pnpm install
pnpm run build
pnpm dsh web- Feel free to submit feedback or bug reports through GitHub Discussions.
- Add the
dsh-plugintopic to your plugin repository for discoverability. - Join DeepSeek Harness Discord community.
See CONTRIBUTING.md.
Start with the development guide and architecture documentation.
For agents, follow AGENTS.md.
Third-party dependencies and their licenses are disclosed in THIRD_PARTY_NOTICES.md.