How Computer-Use Agents Perceive the Screen
Before a computer-use agent can click anything, it has to understand what's on the screen — and the screen is just an image of pixels designed for human eyes. Turning that image into "there's a submit button here, a text field there, an error message at the top" is the perception problem, and it's where computer-use agents most often succeed or fail. This post is about how agents see a GUI, the two main approaches, and why perception is the foundation everything else rests on.
Before clicking anything, an agent must understand the screen — pixels designed for human eyes. The perception problem, the two approaches (vision-based multimodal interpretation vs structured accessibility/DOM data), why hybrid wins, and why perception is the foundation most failures trace back to.