Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The description includes valuable behavioral context regarding the nature of the change ('changes window layout without modifying application files'), which is helpful for safety and user expectations, especially since the annotations only specify it is not destructive. It also details the complex 'backend' parameter logic, which provides specific behavioral constraints on how the action is performed.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.