Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already indicate non-readonly, non-destructive, and idempotent behavior. The description adds no additional behavioral context—such as what suppression does to the timeline, whether it can be reversed, or any side effects. It relies on the user's prior knowledge.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.