Harness Engineering 101: The LLM is the brain, the harness is the body

Explain Like I'm Normal

This guide introduces 'Harness Engineering' as the necessary framework of tools, memory, and interfaces that allow an LLM to interact with the real world. It argues that the model is merely a brain, and developers must build a robust 'body' (the harness) to handle state, security, and execution. The repository provides a roadmap for moving beyond simple chat interfaces into complex autonomous systems.