Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are present, so the description carries the full burden of disclosing side effects such as session creation, invalidation, or read-only status. 'Manage PRO authentication' reveals nothing about whether actions mutate state, require prior login, or what responses look like.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.