Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already cover read-only, non-destructive and closed-world, but the description adds real behavior beyond them: pages are ordered by image ID while display order comes from the order field, pagination must be followed to null, and OAuth is required. It does not mention rate limits or whether all image types/variants are included.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.