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DeepSeek Harness

DeepSeek AI has released DeepSeek Harness (dsh), an open-source agent harness currently in developer preview, built on a plugin-based architecture powered by Cordis. Developers can install it via npx @deepseek-ai/dsh web, which starts a Web UI at http://127.0.0.1:3080 by default. The project is iterating rapidly and warns of compatibility-breaking changes.

read1 min views1 publishedAug 13, 2026
DeepSeek Harness
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DeepSeek Harness (dsh

) is an open-source agent harness developed by DeepSeek AI.

It uses an architecture where everything is a plugin, and is powered by Cordis, whose design is described in A Programming Paradigm for Spatiotemporal Composability.

DeepSeek Harness is currently in developer preview and is iterating rapidly. THERE WILL BE COMPATIBILITY-BREAKING CHANGES.

Install Node.js

, then run:

npx @deepseek-ai/dsh web

The command starts the Web UI, served at http://127.0.0.1:3080

by default. See Web UI guide.

To run from a repository checkout:

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

See CONTRIBUTING.md.

Start with the development guide and architecture documentation.

For agents, follow AGENTS.md.

Third-party dependencies and their licenses are disclosed in THIRD_PARTY_NOTICES.md.

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