Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare destructiveHint=true, readOnlyHint=false, and openWorldHint=true, so the destructive nature is covered structurally. The description does add real scope context by noting webcal subscriptions are included, but it omits whether synced events are cascade-deleted, whether the action is recoverable, and what authorization is needed.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.