DeepSeek has officially released a developer preview of DeepSeek Harness (dsh), an agent framework that allows you to assemble all components like Lego bricks. The reaction from the developer community has been explosive, reaching around 100,000 GitHub stars within just 48 hours of its release.

The most unique design aspect of dsh is that it is built upon a microkernel meta-framework called Cordis. While many existing agent frameworks often have fixed flows for model calls or tool execution, dsh has turned everything—including model adapters, execution sandboxes, tools, and even the core execution loop of the agent itself—into a swappable plugin structure. The framework acts only as a very lightweight microkernel, with actual agent orchestration handled flexibly by independent modules.

Interestingly, instead of an interactive CLI, it provides a local web server by default, as shown in the command below, allowing for visual operation on port 3080.

# DeepSeek Harness 로컬 웹 서버 실행
npx @deepseek-ai/dsh web

There is already a competitive race in the community to build desktop wrapper apps for it. Previously, while developing agents, we often ended up rebuilding the loop from scratch due to the structural limitations of frameworks, so I'm very excited to see if this plugin-centric, microkernel approach can become the standard for the agent ecosystem. It's definitely worth checking out for your toy projects or agent workflows!