Land the PythonCodeRuntime implementation on top of the fd-3 protocol seam: python3 -I per run, binding namespace over fd 3, RLIMIT_CPU/AS, wall-clock timer, and SIGTERM->grace->SIGKILL process-group teardown, with the real-subprocess integration suite. Fixes three defects surfaced on the source PR's review before they ship: - boot-write failure resolved a worker-exit through finish()/settle() that read wallTimer/onAbort/live in their TDZ, rejecting run() instead; the boot write now runs after those bindings and the v8-ignore that hid the branch is removed. - log capture serialized against settlement with no lock while model daemon threads keep writing; LogBuffer now owns one shared re-entrant lock taken by write/flush_line/push. - the fd-3 line residual was a subarray view pinning the whole joined frame; it is copied into a right-sized Buffer via detachResidual so pendingBytes measures what is retained.
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.