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 only says 'List comments', which implies a read operation, but it does not describe the return format, pagination, ordering, or whether the comments include metadata like authors or timestamps. The agent is left without critical information about what to expect from the response.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.