Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden of disclosing behavior. It merely states a literal action without explaining effects like whether existing connections are dropped, whether all contexts are affected, or how to revert. The boolean parameter's true/false meaning is not clarified.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.