Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden. It discloses the behavioral trait of clearing session and cookies, which is a destructive action on authentication state. It does not detail reversibility or side effects on other states, but the core behavior is effectively communicated.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.