Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already cover the safety profile (readOnly, idempotent, non-destructive). The description adds useful behavioral context beyond those annotations: the returned content is an interactive carousel sourced from official SnowSure hero and Sanity gallery images, and it is the designated photo-handling tool rather than a general web search.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.