DeepSeek Harness developer preview
DeepSeek Harness is now in developer preview for agent harness developers worldwide — source code included.
Every capability is a plugin that can be swapped or recomposed: models, tools, skills, sessions, sandboxes, storage, loops, scheduling, and the UI.
Agent = Model + Harness
Harness
The model is the soul of an agent.
A harness lets an agent understand its environment, use tools, and keep working in real-world settings.
Cordis kernel
The Cordis kernel manages plugin mounting, unmounting, and dependencies. Agent capabilities live in the plugins.
Capabilities as plugins
Plugins provide every agent capability, including models, tools, skills, sessions, sandboxes, storage, loops, scheduling, and the UI. Cordis services and events let the plugins work together.
Compose with configuration
Developers can select, swap, or extend any capability in configuration without changing the DeepSeek Harness source code.
Customize your DeepSeek Harness
Get started
Try it now or install from source
Quick start
Install Node.js, then launch the Web UI with npx.
$ npx @deepseek-ai/dsh web
Install from source
Clone the full source and follow the setup instructions in the repository.
$ git clone https://github.com/deepseek-ai/deepseek-harness