Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries full burden for behavioral disclosure. While 'List all notes' implies a read-only operation, it doesn't specify important behavioral aspects like whether results are paginated, sorted, or limited; what format they return; or whether the optional folder parameter affects performance. This leaves significant gaps for an agent to understand how to use the tool effectively.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.