Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare the tool as read-only, idempotent, non-destructive, and closed-world. The description adds useful behavioral context by specifying that it returns both current laws and their past versions, along with fields lawId, title, and text. It does not cover pagination or response limits, but it meaningfully supplements the annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.