Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must disclose behavioral traits. It does reveal that omitting the parameter reports all scene lights, which is a key behavior. However, it does not explicitly state that this is a read-only or non-destructive operation, nor does it describe any side effects or output format, leaving a moderate gap.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.