Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries the full burden. It discloses only that a confirmation message is returned, saying nothing about whether invites/notifications are sent, permission requirements, conflict handling, or reversibility — all material for a scheduling mutation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.