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Write handles now hold a durable lease (session.lock.json beside the log): a random owner token, diagnostic pid, and an expiry. Acquisition wins by exclusive create; a second process's create or write open rejects while the record is unrenewed for less than leaseTtlMs (default 5 min), and takes over after that — a crashed holder is waited out, never reclaimed by pid. The holder renews every leaseRenewIntervalMs (default 4 min); a renewal that finds a foreign, vanished, or expired record — or fails outright — marks the lease lost permanently, so every later append/flush rejects with SessionOwnershipLostError while reads continue. Close releases the record; read handles never touch it. Takeover of an expired record is eventually exclusive: a replaced holder stops within one renewal interval. Refs #3245
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.