Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full behavioral burden and discloses almost nothing: it does not say whether deletion is permanent or reversible, whether the image can be recovered, whether credits are refunded, or what happens on an invalid ID. 'Delete' implies destruction, but nothing beyond that implication is stated.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.