Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of behavioral disclosure. 'Check integrity' implies a read-only operation, but it does not state side effects, failure behavior, or the form of the result, nor does it clarify what 'integrity' covers (missing entries, contradictions, etc.).
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.