Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations declare destructiveHint=true and idempotentHint=false, so the agent knows this is a mutating, non-idempotent write. The description, however, never mentions overwrite risk, whether saving the same title twice duplicates or replaces, or any prerequisites such as an open document — all of which are critical for a destructive write. It reads as a harmless additive 'save' and masks the risk the annotations flag.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.