Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Beyond annotations (readOnlyHint=true), the description discloses a critical behavioral constraint: the 2000-occurrence cap, the error reporting of exact match count, and the recommendation to pre-check with count. It also details the matching logic (within one verse, ordered, window). 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.