Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, so safety is covered. The description's only added behavior is the 'EXPERIMENTAL — untested' warning, which is genuinely useful reliability context, but it says nothing about pagination behavior, result ordering, or membership visibility despite limit/cursor parameters.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.