DeepSeek Harness

deepseek-ai/deepseek-harness

An open-source agent framework DeepSeek released in August 2026. Models, tools, skills, sandboxes and UIs are all composed as plugins; it launches a local Web UI by default.

Why pick itPassed 240,000 stars in just over a month and can load plugins from the Claude Code and Codex ecosystems. Still a developer preview, so the interface may change.

Install

GitHub: deepseek-ai/deepseek-harness
Website: deepseek.com
Stars: ★ 261k
License: MIT
Language: TypeScript
Last push: Oct 23, 2026
Category: Rising in 2026

Good for

Use DeepSeek's open source agent harness through a local Web UI
Compose models, tools, skills, sandboxes and interfaces as plugins
Build your own plugins and tag them with the dsh-plugin topic

Getting started

Install Node.js
Run npx @deepseek-ai/dsh web; the Web UI starts at http://127.0.0.1:3080 by default
Add --no-open to run the server without opening a browser

Before you install

It is a developer preview with compatibility-breaking changes expected; read the project's safety notice (SAFETY.md) before running it.

Summarized by AI from the project docs; check the official docs before relying on it.

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