About the Book

DeepSeek Harness (CLI name dsh) is DeepSeek’s open-source agent substrate. Its design philosophy fits in one sentence — everything is a plugin: model adapters, tool invocation, session management, even the agent loop that drives the whole thing, are all replaceable plugins.

This is a hands-on handbook for developers. It follows four threads — getting started and architecture, deployment and multi-model access, plugin development and agent construction, and real-world case studies. One running example ties it together: ShuTongBuddy, an exam-prep assistant for college students. Chapter 5 develops its plugin package, and Chapter 8 integrates it into a complete web application, ShuTongBuddy Studio — so you learn the whole path from plugin architecture to agent engineering by building something real.

The book is aimed at engineers, researchers and students who already program and want to get productive with agent applications quickly. You only need basic TypeScript and Python reading ability, plus some experience calling an LLM API.

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