Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered structurally. The description adds nothing beyond repeating the annotation title — no note on auth requirements, what 'the request' means, or that it returns the caller's own identity.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.