Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, so description's 'Get details' is consistent. No additional behavioral traits disclosed (e.g., no mention of required permissions, rate limits, or that it returns a single milestone object). With annotations covering the safety profile, the description adds minimal extra value.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.