Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already provide readOnlyHint=false, destructiveHint=false, and idempotentHint=true. The description adds 'existing' to imply the ticket must exist, but no further behavioral traits like permissions or side effects are disclosed. It does not contradict annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.