Harness Engineering for Web Developers: From Prompts to Context to Autonomous Agent Environment Design (Paperback) (ISBN-13: 9798254799177)

Your AI agent is only as good as the environment you build around it.

Prompt engineering got us started. Context engineering leveled us up. But as AI agents become autonomous - writing code, running tests, and deploying changes - a new discipline has emerged: Harness Engineering.

Harness Engineering for Web Developers is a practical guide that walks you through the three-stage evolution of working with AI, from crafting single prompts to designing full autonomous agent environments.

What you will learn:

• Prompt engineering fundamentals - role prompting, chain of thought, few-shot patterns
• Context engineering - context windows, RAG, tool use, MCP, and memory systems
• Harness engineering - architecture constraints, garbage collection, and reliability math
• CLAUDE.md and AGENTS.md - writing effective agent document maps
• The Generator/Evaluator pattern - separating work and verification for reliable output
• Building a harness step by step - linters, pre-commit hooks, ArchUnit, CI/CD gates
• Production harness operations - monitoring, cost management, and self-improving systems

Includes code recipes for Claude Code, Cursor, GitHub Copilot, and OpenAI Codex. Every concept is illustrated with real-world examples using Spring Boot, FastAPI, React, and TypeScript.

Why 95% accuracy is not enough: A 20-step agent pipeline at 95% per step succeeds only 36% of the time. This book shows you how to build the harness that turns that 36% into 95%+.

Written for developers who want to move from talking to AI to building systems where AI works autonomously and reliably.

Author: Yoo Byung Hong
ISBN-13: 9798254799177
Publisher: Independently Published
Language: English
Published: 04/03/2026
Pages: 470
Format: Paperback
Weight: 1.37lbs
Size: 9.00h x 6.00w x 0.95d