While building this we were pleasantly surprised how intuitive the interface feels for prototyping. For example, you can insert chat cells in-between other chat cells, which affects the overall messages (and response from the model). You can tweak the model parameters at every cell. And once you're happy with it you've got a workbook saved that you can revisit in the future (including text annotations).

I'd love to see any workbooks you create for your debugging scenario. Please share them to see if we can improve that scenario further.