Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must fully disclose behavior, but it only says 'duplicate' without explaining what is copied (content, metadata, media), whether the duplicate is a draft, if any permissions are needed, or what the response looks like. This leaves significant ambiguity.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.