Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of behavioral disclosure. It states the core behavior (listing notes) and adds context ('saved from prior conversations'), but does not mention the optionality of the month parameter, result ordering, or possible side effects. For a read-only list operation, this is basic but not comprehensive.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.