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

Harness Engineering 101 likens the LLM to a brain and the harness to a body, addressing common challenges in interacting with LLMs. It covers issues like communicating with LLMs, understanding their behavior as next-token black boxes, and enabling them to interact with the world through JSON-mapped functions. The text also discusses the agent loop for multiple tool calls and the importance of caching to manage the expense of resending data.