What Is an Agent Harness?
What Is a Harness?
An agent harness is the software that wraps an AI model, giving it instructions, tools, and a loop to act on your behalf. This post explains the four core components—system prompt, tools, agentic loop, and translation layer—using a climbing harness as an analogy. It highlights how open-source harnesses like Pi let users own and customize their AI, keeping power in the hands of individuals rather than AI labs.
By building a relationship to and using a harness rather than an application published by an AI lab, the user retains freedom and choice.