Tianyi Cui
b88afa8a72
The producer-source refactor introduced the unreleased V4 discriminator code-mode even though this source identifies images deferred from successful PTC subcalls. Name it ptc-mode before V4 ships so persisted attribution matches the producer and does not freeze obsolete terminology into new logs. Keep the live writer, V3-to-V4 migration output, collision guard, and reserved producer policy aligned. Both released tools-code-mode and tools-ptc plugin lookup keys map to ptc-mode. Preserve those historical keys, opaque message text and IDs, all frozen V0-to-V3 generations, and recorded Session inputs. Update the owning tests, producer documentation, current catalog, and V4 acknowledgement. The canonical schema audit identifies exactly three changed roots; reversing only the source literal restores each prior digest. The large generated JSON diff comes from graph ordering, with 61 roots and 572 types retained. Validation: the seven-file focused run passed 298 tests and exposed four stale current-output expectations in two migration files. After correcting those expectations, both files passed all 23 tests. All 41 documentation gates and full lint passed; frozen generations and recorded inputs are unchanged.
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.