Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full behavioral burden. 'List' implies a read-only operation and the phrase 'observed, and when' indicates topics plus timestamps, but the description does not disclose output format, pagination, freshness, or whether state values are included.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.