Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden. It does not disclose what happens if the text is not visible (error vs false), scope (entire page or viewport), or details like case sensitivity, whitespace handling, or whether it works for partial text matches.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.