Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden of disclosing behavior. It lists the return fields, which is helpful, and 'browse' implies read-only. However, it doesn't mention pagination behavior, ordering, or any potential side effects, though for a read-only gallery tool the risk is low.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.