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* feat(cli): dump native Cordis config schemas * test(cli): include schema dump in launcher help snapshot * feat(cli): export JSON Schema for Cordis configuration * fix(cli): preserve config schema discovery and annotations * fix(cli): conservatively project effectful config validation * refactor(boot): encapsulate profile config schema generation * fix(cli): follow Loader disabling and native writeback in config schema - Dormant group/include rows (disabled without group: true) may omit config and are recorded as childless trees; the entry schema skips their child declarations, matching the Loader, which never creates them. - Lazy builders run once per document, and a wrapped null-only projection keeps a deduplicated type list so the document stays compilable. - Union widening applies only when an earlier branch can write adapted values back through a container; +Infinity max and -Infinity min without a step are treated as the native no-ops they are. - Projection limitations repeat at every entry sharing a Config, and the entry schema documents the boolean/expression domain of disabled. - Record the schema-dump validation policy as an Agent Note.
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.