Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden of behavioral disclosure. It states the primary effect (quit session, release target), adding 'release the target' as extra context. However, it does not disclose side effects such as whether the target process is terminated or if unsaved state is lost, which would be useful.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.