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# Conflicts: # packages/acp/acp/tests/approval.spec.ts # packages/acp/acp/tests/edges.spec.ts # packages/api/session-controller/tests/event-script.client.ts # packages/client/connection/src/client/fixture.ts # packages/client/ui-conversation/src/client/contract/slots.ts # packages/client/ui-conversation/src/client/contract/views.ts # packages/client/ui-conversation/src/client/index.ts # packages/client/ui-conversation/src/client/stores.ts # packages/core/agent-loop/tests/loop.spec.ts # packages/extensions/cordis-client-runner/src/client/slot-catalog.ts # packages/extensions/tool-cordis/src/api-catalog.ts # packages/host/apiproxy/src/api-proxy.ts # packages/host/apiproxy/src/api/events.ts # packages/host/apiproxy/tests/api-proxy-view.spec.ts # packages/interaction/user-approval/src/index.ts # packages/llm/llm-deepseek/tests/adapter.e2e.ts # packages/llm/llm-pi-ai/src/context.ts # packages/llm/llm-pi-ai/tests/context.spec.ts # packages/llm/llm/tests/content.spec.ts # packages/subagent/subagent/tests/continuation.spec.ts # packages/subagent/tool-subagent/tests/tool-subagent.spec.ts # packages/test-support/llm-replay/tests/llm-replay.spec.ts # packages/todo/tool-todo/tests/tool-todo.spec.ts # scripts/gen-persistence-catalog.ts
DeepSeek Harness
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DeepSeek Harness (dsh) is an open-source agent harness developed by DeepSeek AI.
It uses an architecture where everything is a plugin, and is 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 currently in developer preview and is 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
- Feel free to 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.