Addresses the review's two remaining code warnings and the three suggestions: - Log ledgers (host and child) start one byte below the budget, reserving the serialized outer-array envelope (two brackets and n-1 commas over n entries' separators); the exact-zero test moves to maxLogBytes 104 and a new exact-limit case pins that maxLogBytes 5 admits ['a'] (5 bytes) while 4 truncates to the marker alone. - die_if_cpu_exhausted unblocks SIGXCPU (pthread_sigmask SIG_UNBLOCK, captured at import, None-guarded for Windows) before re-delivering it, so a program that masks SIGXCPU, burns past the soft limit, and returns is still classified as a timeout; a regression test pins the masked path. - ast.parse passes filename="<model>" so parse-time syntax diagnostics carry the same source label as compile and runtime tracebacks; the syntax-error test asserts the label. - The NUL-escape test comments use the true six-byte JSON escape \u0000 instead of the caret notation; the README Known Limitations (en + zh) records that PID-reuse protection is inert on macOS; a combined-rebind regression test pins BaseException plus the traceback reporter rebinding together.
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.