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`sendReply` ignored `proto.write`'s `false` return, so a program resolving several large values in one `asyncio.gather` round encoded every reply in the same turn and queued all of them in fd 3's writable buffer. Binding resolution carries no seam-level byte cap to bound that, and the failure kills the host process rather than failing the run: measured on a 64 KiB-highWaterMark pipe, eight 4 MiB replies buffered 32.0 MiB at once against 0.0 MiB once paced. Replies now go through a queue that encodes and writes one frame at a time, awaiting `drain` when the pipe is full. The encode happens inside the loop, so a queued reply the run no longer needs is dropped by the `settled` check without ever being serialized. This was previously deferred on the grounds that serializing would narrow the seam's concurrency contract. That reasoning was wrong: the child matches each reply to its `call` by id from a pump that reads fd 3 continuously, so arrival order was never observable, and the bindings still run concurrently. Only the host's peak memory and the flush timing change. The README entry recording the deferral is removed and the Agent Note records the mechanism instead.
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.