Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full behavioral burden. It usefully discloses the answered-only default and the mandatory confirmation flag, which implies a guarded destructive operation. However, it stops short of stating what is actually cleared, whether the action is reversible, or what happens when onlyAnswered is false.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.