prompt design

A short question with a large payoff. A PM who knows the one rule of prompt caching can cut a feature's input bill dramatically without touching quality.

Caching is the cheapest large saving in most AI products, and a single line of personalisation at the top of the prompt can turn it into a 22% cost increase. The arithmetic is short; the layout insight is what scores.

A common event with a calm answer. The leak itself is usually not the problem; what the prompt contained and what it was being trusted to do might be.