Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, and no destruction. The description adds context by specifying 'normalize' and listing the exact fields returned (offering amounts, first sale, etc.), which goes beyond the annotation hints. No contradictions.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.