Address the ds-review-bot v5/v6 review on PR #3849: - Register the shared `lib/json-stream-*.js` chunk in `packageFileExtras` and order `files` as the workspace-constraints gate requires, so `pnpm run constraints` passes. - Re-validate the preset on the Session `agents.resume` actually attached, closing the TOCTOU window between `observeSession` and the write lease. - Bound one serialized event line at 32 KiB: an over-long event keeps its scalar fields, drops structured ones, and at the extreme reduces to `type`. - Normalize an empty tool-argument string to `{}`, matching the executor. - Scan only real `--json` flags (stop at `--`, skip a `--session-id` value) before installing the JSON error override. Tests: 74 headless unit tests with per-file 100% coverage on src, 14 profile e2e tests, constraints/typecheck/lint/doc/pairing gates, tarball import smoke.
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.