Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint and destructiveHint, but the description adds valuable context: the exact local path (~/Documents/Zoom), sort order (newest first), and which artifact types exist (transcript, captions, saved chat, audio, video). It also notes no API access or admin approval needed, going beyond the annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.