Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already indicate readOnly, idempotent, and openWorld hints. The description adds context beyond annotations by specifying the evaluation standards (IAB, GDPR), the output structure (brand safety score, risk categorization, compliance warnings), and the optional contextual signals. No contradiction with annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.