Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries full burden for behavioral disclosure. It only states the tool 'gets' the list, but does not specify whether an active session is required, if data is cached, or what the output format is. For a read operation without annotations, more detail on side effects or constraints is needed.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.