Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. The verb 'List' suggests a read-only operation, but it does not explicitly disclose lack of side effects, authentication requirements, rate limits, or return format. It provides basic but not comprehensive transparency.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.