Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations do not provide meaningful hints (all false), so the description carries the burden. It does disclose the behavioral output format (separate categories of results), which goes beyond the annotations. However, it does not mention whether running validators has side effects, such as creating a validation run record, which is relevant given readOnlyHint is false.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.