Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and openWorldHint=true, and the description adds genuinely new information: the server has no survey-response capability at all, so an agent shouldn't hunt for a submit tool. It does not mention pagination or result volume, but the key behavioral fact is disclosed.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.