Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnly=false, idempotent=true, and destructive=false. The description adds genuine behavioral detail beyond them: the note is preserved, repeated requests open the same article without overwriting edits, and the tool does not publish. This is meaningful context for a mutation tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.