Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The description adds rich context beyond annotations: non-idempotent, rate limit 10/hour, requires authentication, and the critical note that the secret is shown once and never stored or returned again. Annotations declare idempotentHint=false, readOnlyHint=false, so no contradiction.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.