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DeepSeek Harness (dsh) is an open-source agent harness developed by DeepSeek AI.
It is built on an everything-is-a-plugin architecture and powered by Cordis, whose design is described in A Programming Paradigm for Spatiotemporal Composability.
Documentation: https://deepseek-harness.github.io/deepseek-harness/
DeepSeek Harness is in developer preview and iterating rapidly. THERE WILL BE COMPATIBILITY-BREAKING CHANGES.
Review the safety notice before running the project.
Install Node.js, then run:
npx @deepseek-ai/dsh webThe command starts the Web UI at http://127.0.0.1:3080 by default and opens it in the default browser for a local launch. An SSH launch only prints the host URL because the SSH client or editor owns the local forwarded address. Pass --no-open to run the server without opening a browser. 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 webpnpm run build prepares the repository artifacts. pnpm dsh web uses those built artifacts without rebuilding.
See the Desktop guide for application packaging, release-owned plugin provisioning, and profile recovery. Provider-specific release acceptance requires the actual installed provider; neutral fixture evidence does not qualify a GitHub Copilot release.
- Submit feedback or bug reports through GitHub Discussions.
- Add the
dsh-plugintopic to your plugin repository for discoverability. - Join DeepSeek Harness Discord community.
See CONTRIBUTING.md.
Start with the development guide and architecture documentation.
For agents, follow AGENTS.md.
@misc{deepseek-harness2026,
title={DeepSeek Harness: Everything is a Plugin},
author={DeepSeek-AI},
year={2026},
publisher={GitHub},
howpublished={\url{https://github.com/deepseek-ai/deepseek-harness}},
}Third-party dependencies and their licenses are disclosed in THIRD_PARTY_NOTICES.md.