Developer previewOpen sourceMIT

What Is DeepSeek Harness (DSH)?

DeepSeek Harness is DeepSeek AI's open-source agent harness. The official @deepseek-ai/dsh package runs a plugin-first agent environment powered by Cordis, with composable models, tools, sessions, sandboxes, filesystems, loops, orchestration and UI.

Official project: deepseek-ai/deepseek-harness
Quick start: npx @deepseek-ai/dsh web
Current status: Developer preview; breaking changes are expected

Browse plugin index Installation guide Read Skill compatibility Official repository ↗

Official project mark

0.1.0-rc.6Current npm release candidate

76,689GitHub stars at snapshot

1,282Topic-discovered repositories

MITRepository license

Why it matters

A new substrate, not just another coding assistant

DeepSeek Harness exposes the agent stack as replaceable parts. That can accelerate experimentation, but its developer-preview status means integrations should expect breaking changes.

01 / COMPOSABILITY

Everything is a plugin

Core runtime surfaces are expressed through a plugin system instead of one fixed agent loop.

02 / DISTRIBUTION

Community discovery is forming

The official project points developers to the GitHub dsh-plugin topic; SkillVetAI tracks that feed separately from installable Skills.

03 / VOLATILITY

Preview means unstable contracts

The current release is a 0.1.0 release candidate. Pin versions and review upstream changes before relying on it in production.

Architecture

How DSH, Cordis, plugins and Skills relate

DSH is the npm and CLI identity for DeepSeek Harness. Cordis is the composition framework underlying its plugin-first architecture. Plugins extend runtime surfaces; Skills are optional instruction assets discovered through a separate registry.

DSH

Package and CLI

The official npm package is @deepseek-ai/dsh; the Web UI can be started with npx @deepseek-ai/dsh web.

CORDIS

Composition framework

Cordis provides the plugin composition model behind the “Everything is a Plugin” architecture.

SKILLS

Instruction registry

Skills use their own discovery roots, naming rules and invocation controls; they are not inferred from the dsh-plugin topic.

Quick start

The official README provides one command to launch the Web UI at 127.0.0.1:3080.

npx @deepseek-ai/dsh webterminal

Review the package and its permissions before running third-party code. SkillVetAI does not execute this command for visitors.

Evidence boundary

What this page proves—and what it does not

Snapshot, not certification. Repository stars, forks, npm version and topic counts were observed at Aug 14, 2026, 7:24 AM UTC. They indicate attention and source activity, not security, quality, maintenance, installation success or runtime compatibility. Developer-preview APIs can change without notice.

Primary sources