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The persistence seam is now create/open/stat/list returning per-session SessionHandles (read/append/flush/close); every log read and write flows through the owning handle. The seam package exports only the service and handle contracts, consumer-visible errors, and pure durable-data validation helpers; each backend owns its complete storage runtime, and the shared contract suites pin equivalent observable behavior. The backend routes published sessions' live events by id into the active write handle; agent-loop only acquires, seeds, and closes the handle. Resume appends interruptedTurnClosers through its write handle; session-query owns the revision-keyed cold cache. Legacy-only surfaces are removed in the same swap: locate/readRaw/supportsRawArtifacts, the legacy event-shape read migration, zstd torn-frame salvage, DSH_SESSION_JSONL, and hook transcript_path population; a torn final zstd frame is discarded whole; the session-list cold blank probe returns on stat metadata (eventCount derived from the last physical row, sizeBytes). The WebUI ZIP export serializes the logical log from a read handle, so both backends export identically. 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.