Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already mark it as read-only, open-world, idempotent, and not destructive. The description adds value by specifying it returns 'live' (real-time) data and explicitly listing returned fields (balance, nonce, contract code). No contradictions with annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.