The review's remaining critical: the fd-3 data handler checked the unframed counter against the 256 MiB wire ceiling, so a single 64-256 MiB frame was fully Buffer.concat-joined (a second copy) and only then dropped in the line loop — the peak-memory doubling the pre-join check exists to prevent, for a frame the parser is guaranteed to discard. The counter is now checked against FRAME_PARSE_CAP_BYTES before the join; the regression case asserts a worker-exit with 'protocol frame exceeded' (fail-before: reverting to the ceiling turns it green, proving the join path). FRAME_CEILING_BYTES is removed. The rejection-cap fix now has its regression: a completion value whose class name is 70 MiB of Ns asserts invalid-output, not worker-exit (fail-before: uncapping the diagnostic turns it red). The settlement note (en + zh) updates the remaining stale bound text, and the fd-3 protocol note (en + zh) no longer claims protocol-only exports or a missing Python codec. Pairings re-recorded.
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.