Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden and does add meaningful behavior: it is pay-per-use at 15 USDC on Base via x402 and takes crop+region. It does not disclose output format, error behavior, or auth/rate-limit details, so it is only partially transparent.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.