Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations (readOnlyHint=true, destructiveHint=false) already inform the agent that this is a safe read operation. The description adds value by specifying the returned data types (agenda, minutes, attendees, documents), but does not disclose any additional behavioral traits such as error handling, required permissions, or rate limits. The description builds on annotations but does not exceed expectations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.