Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations only indicate readOnlyHint=false and destructiveHint=false, so the write behavior is implied. The description adds useful context beyond annotations via the pageview prerequisite and goal-name validation rules, but it does not disclose failure behavior, side effects beyond recording, or conditions like idempotency.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.