Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The description adds only an input quality requirement (clear face visibility) and the basic upload/reference workflow. It does not disclose processing behavior, side effects, wait times, or how files are handled, which matters given annotations indicate the tool is not read-only and may have open-world effects. No contradiction with annotations, but little extra context.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.