Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden of behavioral disclosure. 'List' implies a read-only operation, but the description does not explicitly mention side effects, default session selection, or error scenarios. It is minimally transparent for a simple list operation but lacks explicit safety or edge-case context.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.