Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare destructiveHint=true and readOnlyHint=false, which convey the mutation risk. The description adds no extra behavioral context such as permanence, permissions, or effect on dependent processes, so it relies entirely on annotations. It doesn't contradict the annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.