Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already convey that the tool is non-idempotent, open-world, and non-destructive. The description adds the POST endpoint, X-Api-Key header, and fbId requirement, which is useful context beyond annotations, but it does not elaborate on side effects, rate limits, or other behavioral nuances.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.