Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the safety profile is covered. The description adds essentially no behavioral context beyond the word "preview" — it does not say what the cascade contains, what the id refers to, or what the preview response looks like. The fragment does not contradict the annotations, but it contributes almost nothing on top of them.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.