DeepSeek Harness

DeepSeek Harness (dsh) is an open-source agent harness developed by DeepSeek and built on the Cordis "everything is a plugin" architecture. It runs as a desktop app for macOS and Windows or as a local web UI launched with npx. It is currently in public preview and is released under the MIT license.

What It Is

DeepSeek Harness is an agent environment for everyday work, coding, research, and background tasks. Users describe what they want in a chat session, use / commands and @ references to files or sessions, and preview results such as documents, spreadsheets, HTML pages, code, and PDFs. Code changes appear as reviewable diffs that can be refined through conversation.

Everything Is a Plugin

Tools, skills, and parts of the interface are extended through plugins. Users can install plugins from a plugin manager or create them through chat in "Creator mode". Official plugins listed on the homepage include Agent teams, Auto approval review, Scheduled tasks, and Voice input (marked Experimental), along with Terminal, Agent loop, and Subagents. Community plugins are discoverable through the dsh-plugin GitHub topic.

Scheduling and Developer Tools

With the Scheduled tasks plugin enabled, users can start tasks on demand or run recurring work on a schedule, for example a weekly test run with a failure summary. A trajectory view shows execution timelines, tool calls, and runtime details for troubleshooting.

Setup Path

Install Node.js and run npx @deepseek-ai/dsh web to start the Web UI at 127.0.0.1:3080 by default. Alternatively, clone the repository, then run pnpm install, pnpm run build, and pnpm dsh web. The README states the project is in developer preview with compatibility-breaking changes expected and points to a safety notice to review before running.