Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The annotation readOnlyHint=true already signals a safe read operation. The description adds that it returns published hours not bookable slots, which is a useful limitation, but does not disclose other behaviors like network effects, rate limits, or what happens if the business is not found. 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.