Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=false, destructiveHint=true, openWorldHint=true, and idempotentHint=false. The description adds a genuine precondition (trusted owner, interactive Windows x64 desktop) that the annotations do not convey, but it never discloses that the operation overwrites existing clipboard contents, which is the key destructive consequence.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.