Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already mark readOnlyHint=true, and the description adds value by specifying newest-first ordering and cursor pagination behavior. It also calls out 'summaries', implying the payload differs from full webhook details, which is useful context beyond metadata.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.