Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, openWorldHint, idempotentHint, and destructiveHint. The description adds 'today's real golden/blue hour times' and 'current light quality score', consistent with openWorldHint. No new behavioral traits beyond annotations; description adds context but not substantial new information.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.