A coding agent writes the CSS and says it is done. It never sees the result. Nothing hands it a number, so the loop cannot close: the agent guesses, you open the page, you send it back, it guesses again. Every round costs you the one thing the agent was supposed to save. pixelpact reads the reference page and writes down what it actually renders: sizes, colors, spacing, typography, hover and focus states, animation keyframes, design tokens.