Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare this is a non-read-only, non-idempotent, non-destructive, closed-world write. The description adds genuinely useful context beyond them: the privacy implication that a contact email is a real person's personal data and should only be shared with consent. It does not mention submission confirmation or rate limits, but the added privacy guidance is real value.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.