Harness Engineering

Build AI agents that wake up, detect problems, and take action without waiting for a prompt. Through illustrated architectures, six practical use cases, and a runnable Python project, learn how heartbeat systems turn autonomous behavior into reliable automation and how to build a business around it.

The fastest practical path to understanding harness-driven development as a complete system. Through clear visual diagrams and a real repository mapped to the book, you will see how a harness guides AI agents, evaluates their work, detects drift, enforces constraints, supports repair, and keeps software evolution visible, verifiable, and under control.