Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare idempotentHint=true and destructiveHint=false, but the description adds the exact idempotent behavior ('If a draft already exists, returns that draft instead') and a document-type limitation. It omits permission/auth requirements, keeping it short of a 5.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.