Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint and idempotentHint, and the description aligns with them. It adds meaningful context about what the config includes (resolved delivery mode, active From address, DNS records/verification status). The submission instructions relate to the returned endpoint rather than this tool's own behavior, but they are clearly labeled as 'Submissions'.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.