Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries the full burden. It states the core toggle behavior and defines what the grass system is, but does not disclose whether the change is persistent, whether a landscape must be selected, what side effects occur, or what the return value is. This is insufficient for a mutating tool with no annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.