Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so the description's assurance that it 'never starts import or paid inference' mostly reinforces known safety properties with useful specificity about cost and side effects. However, it does not disclose the return shape, freshness, or what 'sync status' means beyond counts.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.