Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnly, idempotent and non-destructive, so the safety profile is covered. The description adds genuinely new context beyond them: the return value is a link, the effect is a new editable board, and the operation consumes no AI credits. Missing details are minor (whether the template itself is consumed, any auth requirement).
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.