The article discusses how coding agents like Claude Code can effectively test user interfaces, particularly for command-line tools and websites. They reveal areas of confusion for new users, helping developers refine their designs before real user testing. This approach offers a fast and cost-effective way to identify usability issues.

Balancing usability and usefulness is crucial for product success; usability focuses on how easy a product is to use, while usefulness addresses whether it solves meaningful problems. A product that excels in one area but fails in the other risks user abandonment and negative reviews. Employing structured testing methods can help ensure a product meets user needs effectively and intuitively.