OSRS Touch Bar displays Old School RuneScape interface icons and maps them to the corresponding function keys in-game.
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On launch, your Touch Bar will display the interface shown above until you quit OSRS Touch Bar (even if you switch apps).
Should you need to access the Control Strip, simply enable it with the Control Strip toggle.
The Touch Bar buttons can be resized with the Fit Buttons to Touch Bar button.
Quitting the app will restore your original Control Strip settings.
Note: if you have your Touch Bar configured to show only the "Expanded Control Strip" or "F1, F2, etc. Keys", OSRS Touch Bar cannot display the RuneScape UI in the Touch Bar! This can be toggled in System Preferences → Keyboard.
The Touch bar can be customized similarly to how the Control Strip is customized in System Preferences. You may add, remove, and reorder as many buttons as you wish.
It should be noted that, like other "global" Touch Bar apps (BetterTouchTool, Touch Bär, etc), OSRS-touch-bar goes against Apple's current Touch Bar guidelines.
In order to use OSRS-touch-bar in conjunction with the RuneScape client, a private API is necessary to circumvent Apple's restrictions on hiding the Control Strip. As such, OSRS-touch-bar links against a private Apple framework DFRFoundation.framework.
tl;dr Since the OSRS client doesn't have its own App Controls, this app adds its own App Controls in the (otherwise unused) Touch Bar space.
Happy 'Scaping!