forms - Do "add" or "edit" functions need a confirm button?

I am designing a UI that includes a list of items that you can add to or edit. When you click on an item it turns into a text dialogue. When you click off or hit "enter" it saves the changes. Does there need to be a placebo "ok" button as well?

Similarly when you click on "Add new item", do I need a placebo "add" button as well as a cancel? Should the placebo confirm button be in both or just one mode?