Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries the full burden of behavioral disclosure. It discloses that original text (descriptions, attendees) is not returned, which is useful. However, it doesn't disclose whether this is read-only, what happens if userId is invalid/absent, response format, or auth/permission requirements. Since userId is not required (0 required params), it's unclear what happens without it.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.