DeepSeek Harness Goes Open Source with Fully Modular Plugin-Based Architecture

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DeepSeek released Harness, a developer-preview open-source AI agent framework, shortly after shipping DeepSeek V4 Pro. The project spans over 230 workspace packages, covering capabilities such as filesystem access, terminal control, language servers, web access, subagents, and workflow orchestration. Built on the Cordis microkernel, Harness treats every capability as a composable plugin configured via a single YAML file, allowing the same codebase to power vastly different products. A notable design choice is a three-layer separation between capability interface, implementation, and model-facing tool presentation, making it possible to swap execution environments without rewriting agent logic. The architecture positions the AI model as one component within a tightly governed system rather than the autonomous driver of it.

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