Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, safe reads. The description adds genuinely new behavioral context: that provider-authored content is reported as data, separated from reviewer findings — useful for interpretation. But it doesn't disclose output shape, pagination, or what 'public evidence' entails beyond that.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.