Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, and the description adds context: it is 'free live forward', 'every launch from a proven deployer, entered +30min, held', and 'lookahead-free'. This provides behavioral specifics beyond the annotations, though it could mention data freshness or scope limitations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.