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Measured against 0.2.1-rc.4 and master with the frame-sampled motion matrix, the transcript moved back and forth at Turn end and around input landing. This keeps rc.4's landing behavior, master's steering layout, and fixes the reversals that remain. - Completion-time folding keeps the first visible surviving row still when work rows close at once, filling the gap with bottom space capped at half the scrollport, instead of letting the browser clamp the position. - After the Session stops running, the running status keeps its tail slot hidden and silent until the Turn's actions row replaces it, so the tail does not shrink and grow back. - A Turn's duration control takes its gap in one frame instead of sliding. - A fold batch that takes over following for a content change absorbs growth outside the batch before its first frame. - Steering lands at once under either fold timing: the running Turn keeps streaming above its echo, which a native animation would push down. - The running status no longer slides below a Step's first output, and the column no longer carries `data-chat-tail-pinned`; the steering entrance keeps its animation. - A queued prompt is accepted by its Inbox row as well as by its receipt, so the composer clears the draft in the frame the queue dock shows it. - A queued echo waits for the Inbox projection instead of retiring on the durable splice, so the queue dock does not empty for a frame.
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.