When to write prompts
During high-level and detailed design
Starting with sample dialogs for a conversation on Google Home
The first prompts you write will be in your sample dialogs. We recommend starting with a conversation on Google Home. If you start designing with a screen in mind, it can be easy to lose the thread of the conversation and end up with a graphical interface that is not suitable for conversation. Getting the conversational flow right is easier if everything is in one place—the spoken prompts. As you expand to other interaction types, pieces will move out of the spoken prompts and into the display prompts, chips, and visuals.
When you have a clear understanding of the conversational context
It’s impossible to write a good prompt without a detailed understanding of the context. What happened before in the dialog? What could happen next? What’s the user’s mental model for the thing you’re talking about? Refer back to your sample dialogs throughout the design process to make sure any prompt edits or new prompts still fit with the overall flow of the conversation.