Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare destructiveHint=true, but the description adds context by stating 'Permanently delete' and 'all of its captures', which clarifies the irreversibility and scope. It also reinforces the confirm=true requirement, which is useful beyond the annotation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.