DeepSeek's Agent, One Command

What it is

DeepSeek Harness (dsh) is DeepSeek's open source agent harness. It is built on an "everything is a plugin" architecture, it is MIT licensed, and it has passed 225K stars on GitHub.

In plain words: it is the machinery around the model. The agent loop, the tools and the interface all run on your machine, and you can swap pieces in and out as plugins.

Before you start

It is a developer preview. DeepSeek says it is iterating fast and that there will be compatibility breaking changes. Read the safety notice first: https://github.com/deepseek-ai/deepseek-harness/blob/master/SAFETY.md

Install a current Node.js release. In our own test, an older Node 20 build failed on launch, so grab the current LTS from nodejs.org.

Use the official package only. Other projects use the same "dsh" name. The official one is published by DeepSeek under the name shown in the command below. If a tutorial tells you to install something else, skip it.

Launch it

Open your terminal and run:

npx @deepseek-ai/dsh web

That starts the web UI at http://127.0.0.1:3080 and opens it in your browser. Want the server without a browser window? Add the no open flag:

npx @deepseek-ai/dsh web --no-open

Prefer building from source?

git clone https://github.com/deepseek-ai/deepseek-harness.git
cd deepseek-harness
pnpm install
pnpm run build
pnpm dsh web

About cost

The harness itself is free and open source. The model calls are not automatically free, so check the docs for how your model connects and what that provider charges before you run long tasks.

Docs: https://deepseek-harness.github.io/deepseek-harness/

Rather not use a terminal?

There is a community desktop app called DSH Desktop that bundles the harness into an installable app for Windows, macOS and Linux. It is a community project, not an official DeepSeek product, so treat it with the same care as any third party download.

Going further: plugins

Because everything is a plugin, the ecosystem grew fast. Plugin authors tag their repos with the dsh-plugin topic on GitHub, and one community index already lists more than 300 plugins.

Browse the topic: https://github.com/topics/dsh-plugin

Links

Repo: https://github.com/deepseek-ai/deepseek-harness Safety notice: https://github.com/deepseek-ai/deepseek-harness/blob/master/SAFETY.md Docs: https://deepseek-harness.github.io/deepseek-harness/

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