Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already cover the safety profile (readOnlyHint=true, idempotentHint=true, destructiveHint=false), so the bar is lower, but the description adds almost nothing. "Cascade preview" faintly implies it returns what would be affected by a cascading delete, but the response shape, whether it summarizes related objects, and typical size are all undisclosed.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.