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DeepSeek Harness

An open-source modular agent framework and development environment released by DeepSeek AI, built on the Cordis framework with a plugin-first architecture decoupling model adapters, execution loops, and tools.

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01DeepSeek Open-Sources Modular Agent Framework DeepSeek HarnessDeepSeek has open-sourced DeepSeek Harness (dsh), a modular agent framework. Built on the Cordis meta-framework, the system employs a plugin-first architecture to decouple model adapters, execution loops, and tool registries while providing both CLI and local Web interfaces for transparent and extensible agent development.8/15/2026