Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries full behavioral burden, yet it does not say whether deletion is permanent, whether undo can restore it (an undo tool exists among siblings), whether the source media is touched, or what happens if the sequence is currently active. It signals destructiveness only through the verb 'Delete'.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.