Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must carry full behavioral transparency, but it only says 'Wait for seconds.' It does not disclose whether this blocks the page, whether it returns a value, or whether it has side effects. The behavior is implied but not elaborated.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.