Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so the safety profile is covered. The description adds genuinely new context beyond them: the resource is public, requires no authentication, and the URL is permanent and shareable (implying stable, cacheable, non-expiring reads). It does not discuss error behavior for an unknown or malformed ID.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.