Tianyi Cui
c6e62ff971
A reader can reject a property name while its type declares that property as optional never. Dropping it from the extracted schema makes a future optional JSON value look additive, although the existing reader refuses it. The type history must retain that explicit prohibition. Support the argument-free @persistenceReserved marker only on optional properties whose values are never or undefined. Keep those properties as optional primitive-never nodes, so later JSON values change an existing field and require a version bump. Reject invalid placement, arguments, repeated tags, required or JSON-valued declarations, and mapped uses that violate the reservation. Keep every unmarked omission rule unchanged. The classification regression failed before this change with an additive optional-property result and now requires a type-change bump. All fifteen focused reservation cases and all 210 tooling tests pass, including inherited fields, misuse, and unmarked preservation. Host typecheck, scoped lint, and pairing pass. Regeneration leaves the unannotated baseline catalog and inventory byte-identical; all 61 roots still match their existing history. No runtime property is activated in this tooling commit.
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.
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.