Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries full responsibility for disclosing behavior. It only mentions 'raw TweetDetail response', which hints at the return format but does not mention authentication needs, error behavior, rate limits, or side effects. The read-only nature is implied but not explicitly disclosed.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.