Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnly/idempotent/non-destructive, but the description adds substantial context beyond them: the 7-day handle lifetime, the exact field set returned, and explicit negative guarantees (no bid amounts, contractor names or job text). The 'expired means the one-hour link lapsed before the homeowner opened it' note explains a non-obvious state transition an agent would otherwise misread.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.