Action buttons are cues for the next step. The two types of action buttons are: quick reply buttons and menu selection.
Quick Reply Buttons
Quick reply buttons are suggested actions that provide next steps related to the user’s primary intent. They guide users to discover additional actions relevant to the task.
Keep in mind that a quick reply button is best used when it recommends meaningful next steps pertaining to the intent, and even to accomplish tasks beyond the user’s intention.
Quick reply buttons can be placed in these areas: below a response or below a card. Avoid applying the actions inside a card. Instead use standard buttons.
Labels for quick reply buttons should be concise and straightforward. Labels should not exceed more than 30 characters. Be mindful that labels correspond with the overall intent and not to the immediate action.
Quick reply buttons are optional and allow users to select only one action. Selecting or typing a response dismisses the quick reply buttons.