Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and destructiveHint=false, but the description adds valuable detail about the response content (status, user response status, awaited participants, etc.) beyond those flags. It does not contradict annotations and gives a fuller picture of what a successful call returns.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.