DeepSeek Harness: Ship Your First dsh Plugin Bundle

DeepSeek open-sourced DeepSeek Harness on August 13, 2026, and the repo went vertical almost immediately — one tracker clocked 95,000+ stars inside two days, and it has kept climbing since. Most of the coverage stopped at "run npx @deepseek-ai/dsh web and look, a free coding agent." That misses the interesting part.

The interesting part is the architecture. In dsh, everything is a plugin — the model adapter, the tool registry, the session log, and the agent loop itself. There is no privileged core to fork. You extend the harness by mounting a plugin beside the others, and every registration is a reversible effect that unwinds when its plugin unloads. That means a capability you add is a first-class citizen, not a monkey patch.