The load-time addressSpaceMb gate used a 1/8 fraction derived for ASCII, but the child ledgers trigger on character count against a serialized-byte budget: an astral character is one character yet ~4 bytes stored and ~4 encoded, live at once, so the true worst-case peak is ~8x the budget, not ~2x. Replace the fraction with an explicit OUTPUT_BUDGET_WORST_CASE_ADDRESS_SPACE_MULTIPLE (8) and a strict `>`, and gate maxValueBytes the same way as maxLogBytes — the value path builds and encodes a near-budget completion under the same RLIMIT_AS, so the incompatible pair was previously admitted there too. Slice the newline branch's unterminated tail to a budget-sized prefix: it buffered the whole text[pos:] before the flush trigger could bound it, so an early newline plus a huge tail made a second full copy of the model's string — an RLIMIT_AS death the config gate cannot cover since the tail can far exceed maxLogBytes. Disclose the cross-field constraint in the maxLogBytes/maxValueBytes/addressSpaceMb JSDoc (regenerating config-catalog); refresh the note's stale Buffer.byteLength(JSON.stringify) reference; reconcile the arrival-order rebuttal with the seam's "in order" logs JSDoc (within-stream, cross-stream best-effort). Extend the load-rejection test to both budgets and add a tail-copy regression; sync the zh pair.
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.