Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Without annotations, the description carries full burden. It discloses the process, return values (payment URL, price), and cost ($15 USDC on Base). However, the term 'Free' is ambiguous—possibly meaning the tool itself costs nothing, but it contrasts with the payment requirement. Minor confusion prevents a 5.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.