Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnly, idempotent, non-destructive, closed-world behavior, so the safety profile is covered. The description adds genuinely non-structured context: it clarifies this is not an account-creation path and discloses output truncation semantics (large restriction lists are omitted and replaced with exact authorized resource pointers rather than being downgraded to unrestricted/null authority).
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.