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* feat(tool-cordis): inspect live plugin Config schemas Replace the Host `Builtin` inspect provider, which described a dynamic Host half the model can no longer define, with a `Config` provider that lists every live Loader entry with its Config status and projects one entry's native Schemastery Config into a self-contained JSON Schema document. app-boot exports its projector, native-schema check, and the shared `loaderExpression` definition for the live walk; the CLI dump keeps its profile-composition path. * fix(tool-cordis): refresh config catalog pointer and presets e2e provider list * fix(tool-cordis): resolve the Loader at Config query time A Host composed programmatically without a Loader keeps registering the inspect providers; `Config.listConfigs` reports the missing Loader when queried. Refresh the advanced-toolchain recordings whose provider list now carries `Config` in place of `Builtin`. * docs: regenerate module graph for the tool-cordis app-boot dependency * docs: regenerate event graph pointer for app-boot exports * fix(tool-cordis): address review on the Config inspect provider Report the Loader entry id (unique across include trees) beside the tree-local patch id, classify group and include carriers as `tree`, treat disabled and disposed fibers as `inactive`, and drop the unreachable boolean-schema branch by narrowing the projector's root type. The presets e2e now queries `Config.listConfigs` over the booted Web profile and projects the shipped `tools` row; the advanced-toolchain recordings carry the updated manifest. * fix(tool-cordis): page the Config directory and filter it by plugin name A full directory of a shipped Web profile exceeds the 50000-byte spill cap once rows carry more fields, and the spilled preview is no longer JSON. `Config.listConfigs` now returns pages (`offset`, `limit` up to 100, default 25) with `total` and `nextOffset`, and an exact plugin `name` filter; the presets e2e reads the shipped rows through the filter.
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.