Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden and does not say whether this mutates or deletes media, whether it is reversible, what 'consolidate' does to the surviving copy, or what permissions are needed. For a zero-param operation with an implied destructive effect, this is a meaningful gap.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.