Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of behavioral disclosure. It does disclose that the list is dynamically read from the website's select dropdown, implying a live fetch rather than a static lookup, and the verb suggests a read-only operation. However, it does not mention potential network dependencies, failure modes, or what the returned list looks like.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.