Does the description explain when to use this tool, when not to, or what alternatives exist?
No guidance is provided about when to use this tool versus alternatives. The description doesn't mention any context, prerequisites, or exclusions, and with many sibling tools available (like 'navigate', 'go_to_timecode', or 'timeline_history'), there's no indication of when zooming is appropriate versus other timeline manipulation methods.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.