Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries full burden for behavioral disclosure. It only states that it generates random dates, omitting important details like output format, handling of invalid parameters (e.g., start_year > end_year), or whether results are deterministic. This is insufficient for an agent to understand side effects or behavior.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.