Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description bears full responsibility for behavioral disclosure, but it only states the action 'Type a string.' It does not mention focus requirements, timing, special character handling, or error conditions, leaving the agent without insight into side effects or prerequisites.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.