Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden of disclosing behavior. It only says 'Get system logs' and provides no context about log format, pagination, time range, or read-only guarantees. The count parameter is documented in the schema, but the description does not explain pagination limits or the nature of the returned data.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.