Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already mark the tool as read-only and non-destructive, and the description adds useful behavioral context by stating it is informational rather than advice and by summarizing what the output includes, including a headline cross-border planning point. It does not discuss authentication, rate limits, or caveats about legal authority, but for a read-only lookup these are less critical.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.