Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries full behavioral disclosure burden. It only says 'invite' and the role format, but does not disclose consequences like sending an email, creating a pending invitation, duplicate handling, or whether the invitee must accept.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.