Beware the Medtronic Easy Bolus button⌁
Medtronic's easy bolus button has been the cause of several accidental boluses when the pump has been carried in a pocket. Best practice would be to disable the Easy Bolus button since you will be doing boluses from the phone anyways.
Health app permissions⌁
Do not let other apps, such as Spike App or MyFitnessPal, on your iPhone write carbohydrates to Health app. Loop could read those carbohydrates and you could be dosed for those carbohydrates. You can read more about Health permissions here.
Finish your Medtronic priming⌁
After a site change and reservoir rewind, Medtronic's pump will have a menu on the pump screen related to finishing your prime. Make sure you complete that screen and always return to the main menu. Medtronic's pump won't resume basal insulin delivery until that priming screen is completed.