Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The annotation already declares destructiveHint=true, so the agent knows it's destructive. The description adds no extra behavioral context (e.g., whether it permanently deletes or just unbooks, impact on associated data). The vague term 'unbook' could mislead about reversibility.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.