Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, and the description adds concrete behavioral context by specifying the content categories (adults-only, explicit content between fictional adults allowed, prohibited categories) and the presence of a link to the full policy. This goes beyond a simple read-only claim, giving the agent a preview of what the response will contain without contradiction.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.