Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the behavioral disclosure burden. It adds useful context by specifying 'immediately' and clarifying that both navigation and held movement controls are stopped. It does not describe behavior when no movement is active or whether the stop is idempotent, which would strengthen transparency.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.