Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full behavioral burden. It usefully discloses one key side-effect constraint (the app stays alive), which is the most important thing to know. However, it says nothing about whether the CDP session can be resumed, whether the operation is idempotent, or what state is torn down.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.