Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description must cover behavioral traits. It states the return value (new visibility state) but does not disclose side effects, permissions required, or whether the toggle is client-local or persistent. This is minimal but adequate for a simple toggle.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.