How the IsVisible works is described at Restricting Visibility of a Plugin to Specific Entries in CM.
See below examples as well as subclip properties that can be accessed with the get operator.
isVisible key value
|get('durationMs') > 1000
Plugin is visible only if the duration of the subclip is higher than 1000ms
e.g. Export Podcast workflow: I as an admin want to restrain my users from creating podcasts smaller than 10sec as I otherwise ...
Only for subclips. You can access subclip properties as below by using the get operator.
|Returns the duration of a subclip in milliseconds
|Returns the start position of a subclip in milliseconds
|Returns the subclip title
|Returns the layer number of a subclip
|Returns the (user) owner of the subclip
|Returns the comment value of the subclip
|Returns the durationMs + startPosMs