Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, and destructiveHint false, so safety is covered. The description adds useful behavioral context beyond annotations: the source is the GLEIF API, no API key is required, and the response includes legal name, status, addresses, LOU, and renewal dates.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.