_KermanandTianyi Cui
f4a32dbd0a
Represent tool results as tool-role messages and migrate released wrappers without losing outer own JSON fields, call identity, error state, or writer field order. Refuse nested or wrapper-only information that has no lossless current representation before successor publication. Validate current event relationships directly instead of projecting V4 data back into V3. Keep lifecycle, PTC, title/command, compaction, system-field and retired-syntax checks on catalog restoration and ordinary JSONL opens. The Worker JSON equality helper must inspect own keys so it cannot admit PTC arguments that Node rejects. Keep the source role change, required native admission and consumer fixture updates in one complete review layer. Explain shared-type changes in the persistence record and the native reader rationale in its existing note. Use checked branded fixture identities and discriminant narrowing instead of unknown double casts; fixture values and assertions remain intact. This recomposes the original tool-role work by _Kerman with the independently validated migration and admission repairs by Tianyi Cui. Frozen generations and snapshot input version selection are retained. Co-authored-by: Tianyi Cui <[email protected]>
DeepSeek Harness
English | 中文
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.
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.