Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries the full responsibility for behavioral disclosure. It only says 'add time to a datetime' and omits important behaviors such as the return format, timezone handling, support for negative values, and how calendar boundaries are handled.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.