The bar is primarily used to display widgets on the screen. As a result, the bar does not need many of its own commands.
To select a bar on the command graph, you must use a selector (as there is no default bar). The selector is the position of the bar on the screen i.e. "top", "bottom", "left" or "right".
The bar can access the screen it's on and the widgets it contains via the command graph.
.. qtile_graph:: :root: bar
.. qtile_commands:: libqtile.bar :object-node: bar :object-selector-string: position :no-title: