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deepseek-ai/deepseek-harness

⭐ 222779 TypeScript added to this list on 2026-08-17 repository created 2026-08-13

DeepSeek Harness, distributed as the dsh command, is an open-source agent harness published by DeepSeek AI under the MIT license. Its organising idea is that everything is a plugin: the runtime itself is a thin core, and capabilities from the user interface down to individual agent tools are supplied as separate plugin modules. The plugin system is powered by Cordis, a composition framework whose design is described in the paper A Programming Paradigm for Spatiotemporal Composability, so plugins are composed rather than hard-wired into the harness. The documented entry point is a web interface: users install Node.js and run npx @deepseek-ai/dsh web, which starts a local server on 127.0.0.1 port 3080 and serves the UI covered by the repository user guide. Running from a source checkout is supported as well, through git clone followed by pnpm install, pnpm run build and pnpm dsh web, which is the path documented for contributors. The repository carries a development guide, architecture documentation, a contributing guide and an AGENTS.md file describing conventions for agents that work inside the codebase, plus a separate disclosure of third-party dependency licenses. The maintainers label the project a developer preview that is iterating rapidly and state explicitly that compatibility-breaking changes will happen, so current interfaces should not be treated as stable. Plugin authors are asked to tag their repositories with the dsh-plugin GitHub topic so the ecosystem can discover them, and support runs through GitHub Discussions and a Discord community. The intended audience is developers who want an extensible host for LLM agents and can track a fast-moving codebase; several third-party projects, including preset packs and skill collections, already target dsh as a host.

https://github.com/deepseek-ai/deepseek-harness

agent-harnessplugin-architecturedeepseekcordisllm-agentstypescriptweb-ui

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