Move exact user-patch watching into app boot and audit activation explicitly. Wait for CLI fallback HMR and preset subtrees. Join the first fiber-disposal result in the directory chooser and browser package runner. Keep async update errors observable without restoring generic Loader rollback. Restore the current workspace-link and Schemastery manifests and their gate. Preserve unconditional patch-input cloning, awaited Include initialization, and durable teardown writes. Update diagnostics, snapshots, bilingual docs, and the exhaustive vendor divergence ledger. Validation: focused Loader, watcher, preset, inventory, and cleanup tests; 100% watcher coverage; 32 Web preset cases; real CLI webhook model session; SDK smokes; 13 headless expected cases; 3 recorded-session replays; build, typecheck, lint contracts, and all 34 doc-sync gates. A full Node 24/Python 3.12 Vitest run had 21806 passes and two failures: a baseline-reproduced experimental CSS import failure and a Python probe timeout that passed alone. The default Node 26/Python 3.9 run additionally exposed unsupported Python and FileHandle-GC host failures.
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.
License
Third-party dependencies and their licenses are disclosed in THIRD_PARTY_NOTICES.md.