The making of a model, in simple words
· 5 min read
Today, harnesses like Claude Code, Codex CLI and Pi have become an essential tool in product development. It has only been about six months since we've started calling them that. A year ago, barely anyone had ever used a harness.
Since it became mainstream rapidly, many haven't found the time to explore what these tools are made out of. Here's two diagrams and a quick description of each component.