DeepSeek Harness

DeepSeek Harness, dsh for short, treats the coding agent itself as a stack of replaceable parts: models, tools, skills, sessions, sandboxes, storage, scheduling, the agent loop, and even the UI are plugins composed over the Cordis kernel, which wires them together through services and events. That inversion means teams can keep a familiar chat front end while swapping the model provider underneath, replace the context injection strategy without forking, or schedule subagents for delegated work. Getting started is a single command, npx @deepseek-ai/dsh web, which serves a local web UI on port 3080, and the full TypeScript source builds from GitHub. The August 2026 developer preview landed with extraordinary momentum, passing 190k GitHub stars, though DeepSeek warns that core plugins and APIs will keep breaking as the design settles. Everything is MIT licensed with third-party notices documented. For developers who find existing agent CLIs too opinionated, this is the current center of gravity for rolling your own.