Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already indicate readOnlyHint=false (mutation) and destructiveHint=false (non-destructive). The description only restates that it creates a tag, adding no extra context about uniqueness, consequences of duplicate names, or required permissions.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.