Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint and idempotentHint, so the description carries a lower burden. It adds minimal context by specifying the 'configured' instance, but does not explain what 'healthy' means, the return format, or behavior on failure, offering only modest value 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.