Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries the full disclosure burden. It merely restates the basic behavior and does not mention edge cases like negative values, DST handling, invalid date inputs, or that the result is a new date, none of which are covered elsewhere.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.