Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, openWorldHint, idempotentHint, destructiveHint. The description adds critical behavioral context: MAUDE reports are unverified and cannot establish causation, incidence, prevalence, or comparative safety. This goes beyond annotations to set expectations about data reliability.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.