Tianyi Cui
d7e523b8b8
Cold current-generation reopen freezes the complete decoded event graph before publishing shared-frozen history. Compact assistant streams carry 125,000 text values and 124,600 time deltas in the required benchmark; for-in traversal enumerates their array indexes as string property keys. An open-only profile attributes about 4.2 ms to complete event freezing. Use numeric indexing for arrays produced by JSON decoding and the fixed migration catalog. Those arrays contain indexed JSON values only. Keep every Object.freeze call and every nested-object visit, preserve the object-key path including own __proto__ and constructor data, and never infer deep immutability from a shallow Object.isFrozen result. No decoding, admission, relationship validation, or freezing moves past open(). The unchanged five-sample V4 reopen median falls from 22.6 to 17.7 ms on M4 Pro / Node 24.19. Restoring and rebuilding the exact old traversal gives 21.7 ms. First-history and resume also improve; Agent retained heap stays 4.5 MB and every 128 MB case completes. Keep the existing 63 ms gate, fixture dimensions, cold-process setup, and all other budgets unchanged. Local measurements establish removed work; hosted CI remains the required runner verdict. Cover nested opaque arrays and objects, special JSON keys, rejected mutations, and shared event identity through historical V3 and native V4 reads. Record the before/candidate/restored samples and the local-versus-CI limit in the existing performance note.
DeepSeek Harness
English | 中文
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.
Citation
@misc{deepseek-harness2026,
title={DeepSeek Harness: Everything is a Plugin},
author={DeepSeek-AI},
year={2026},
publisher={GitHub},
howpublished={\url{https://github.com/deepseek-ai/deepseek-harness}},
}
License
Third-party dependencies and their licenses are disclosed in THIRD_PARTY_NOTICES.md.