Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of behavioral disclosure. It usefully reveals the output fields and the cost, but it does not mention authentication, rate limits, pagination, data freshness, failure modes, or how payment_signature is used to settle the price.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.