Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries full behavioral burden, and "Permanently" is a genuine disclosure that the operation is irreversible. However, it says nothing about required permissions, cascading effects on related invoices/services, or failure behavior for an invalid ID.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.