DeepSeek Harness

Harness is listed in the official product nav beside Web, App, and API. The English Harness page title is “Everything is a plugin.” It is a locally first coding agent and runtime, source included, aimed at people who build harnesses. Quick start: npx @deepseek-ai/dsh web. Source: github.com/deepseek-ai/deepseek-harness.

Plugins cover models, tools, skills, sessions, sandboxes, storage, loops, scheduling, and UI, composed through a Cordis kernel. Runs are traceable in an append-only session log. Modes listed: Standard, Code, Minimal, Creator. I did not treat this as a hosted chat replacement. It is a laptop-side loop.

Pair it with DeepSeek-V4-Pro when the agent is doing real work, or read agentic coding.