DeepSeek Harness Officially Launches: First Agent Product Enabling Self-Assembly of the Entire Agent

According to PolyAnalyst Beating monitoring, DeepSeek has officially launched its first Agent product, DeepSeek Harness, and the software package has been released to npm. Previously, V4-Flash's public Code Agent evaluation used the minimalist mode built into the Harness.

It is not just a Coding Agent similar to Codex. The Harness supports project management, long tasks, multiple Agents, Skills, online search, and context management, and also allows users to create different "Agent presets." Tasks such as coding, research, and writing can be configured with different tools, prompts, and workflows.

What's even more special is the plugin system. DeepSeek has "Everything is a plugin" as a core design principle, where models, tools, prompts, storage, context, and even the interface can be replaced or combined through plugins. Beta users have created plugins for long-term memory, interface modifications, and more.

In short, while Codex is more like a ready-made Agent, DeepSeek Harness is more like a runtime for assembling Agents. Users are not just choosing a model but also deciding what tools the Agent should use, what rules to follow, and how to operate.