Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already convey mutability and idempotency, so the description is not burdened with those. It adds useful context by requiring an API key and scoping the pattern to that key, and it references the search syntax behavior. No contradiction 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.