Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnly, idempotent, non-destructive. The description adds valuable behavioral context beyond that: an audit appears only after a worker picks it up, normally within seconds, which sets expectations for polling. It does not cover edge cases like unknown/expired jobIds or what an empty call returns, so it falls short of a 5.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.