Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. It does disclose the notable behavioral trait that the result is conditional on a module being enabled, which is genuinely useful context. What's missing is whether this is a read-only lookup (implied), what happens when disabled, and what the payload contains.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.