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* refactor(preset): trim the creation-mode system prompt The `cordis` preset persona repeated what the plugin_manager and cordis_inspect_* tool descriptions and the two shipped skills already carry. Keep only identity, the shipped-preset constraint, the visual request routing rule, and which skill to load for what. Drop the tool-cordis prompt section, which restated its own tool descriptions, and the cordis_inspect_query navigation hints that the provider manifests returned by cordis_inspect_list already state. Shorten both skill descriptions so the first-turn catalog stays small. First-turn request for the cordis preset, measured through the DeepSeek API with deepseek-v4-flash: 9572 -> 8975 prompt tokens. * docs: regenerate config catalog after section order removal * docs: regenerate module graph after tool-cordis dependency removal * refactor(preset): give the cordis preset the standard persona Creation mode's system prompt now equals standard mode's; the skill catalog and the shipped skills carry every routing and off-limits rule. The plugin skill description states the visual-request destination. First-turn request for the cordis preset: 9572 -> 8815 prompt tokens. * fix(review): document current tool-cordis state and pin the shared persona The tool-cordis README pair now states that only the two tool schemas enter requests, that disposal removes tools and providers, and that the first-turn skill catalog carries the routing. The Web skill row test resolves the owner's selected fixture generation instead of a fixed v3 path. The preset e2e asserts the cordis persona sections equal standard's.
DeepSeek Harness
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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/
Developer preview
DeepSeek Harness is in developer preview and iterating rapidly. THERE WILL BE COMPATIBILITY-BREAKING CHANGES.
Review the safety notice before running the project.
Run
Run from npm
Install Node.js, then run:
npx @deepseek-ai/dsh web
The 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.
Run from source
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
pnpm run build prepares the repository artifacts. pnpm dsh web uses those built artifacts without rebuilding.
Community and support
- Submit feedback or bug reports through GitHub Discussions.
- Add the
dsh-plugintopic to your plugin repository for discoverability. - Join DeepSeek Harness Discord community.
Contributing
See CONTRIBUTING.md.
Development
Start with the development guide and architecture documentation.
pnpm run dev:web builds, serves, and rebuilds client bundles on source edits in one terminal, and make help lists the matching Make targets for Web and Desktop; the guide's application commands section owns the full table.
For agents, follow AGENTS.md.
Citation
@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}},
}
License
Third-party dependencies and their licenses are disclosed in THIRD_PARTY_NOTICES.md.