Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations provide readOnlyHint, idempotentHint, destructiveHint. The description adds that the tool is paginated and returns specific fields (variable names). No contradictions. However, it does not disclose how pagination works (e.g., default page size, maximum results) or any other behavioral quirks.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.