DeepSeek Harness quick start

Before starting

• Use a supported Node.js environment and a project folder that is safe to inspect.
• Do not begin in a directory containing secrets or files you are unwilling to change.
• Keep the Web UI on its default loopback address rather than exposing it to a local network.
• Have the API credential for the model provider you intend to configure.

Launch the official Web UI

npx @deepseek-ai/dsh web

Complete one small, observable task

1. 01

   Open the printed loopback address

   The default is a browser UI on port 3080. Use the address printed by the process and keep the terminal running.

2. 02

   Configure a model

   Open Settings and add the required provider credential. Do not paste credentials into a conversation or project file.

3. 03

   Choose a disposable workspace

   Add the project directory you launched from, then select it. The composer remains unavailable until a workspace is selected.

4. 04

   Ask for a read-only first task

   Start by asking the Agent to summarize the repository and identify its main packages. Review what it reads before requesting edits.

5. 05

   Read every approval prompt

   Check the command, path, and intended effect. Reject an operation that reaches outside the selected workspace or does more than the task requires.