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- Export `ProjectionKeySelection` (the read faces' key selection) and reuse it from the projection cache instead of restating the union twice. The Cordis catalog can now resolve the type its generated signatures reference. - Make `wire.summary` a plain boolean: omitted means `true`, and a key whose map entry carries the summary mark declares `false` so the runtime key set and the client view type agree. The type no longer forbids a declaration. - Describe the mark accurately: it has no runtime representation; `wire.view` and `viewSchema` are typed with `SessionProjectionViewValue`, which strips it, so the registration erase only widens the state type. - Say plainly in the package README, the subsystem page, the client field comments, and the Agent Note that a list row carries the summary projection and never the full projection: a connected Session's store may hold more values, but those are outside the list contract. - Document the summary vocabulary on the subsystem page with `ts type-equiv` blocks for the mark, its stripping, the excluded-key test, the summary value type, and the key selection; split the prose paragraph. - Revert the behavior-neutral cache-double refactors in three specs, and record in the Agent Note why no upgrade guide accompanies the wire change and how a consumer migrates.
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.