There have been a few updates inside the Dialogflow Simulator recently.
First of all, the name itself has changed. The simulator used to be called the test console before. But that isn't the update I am talking about. 🙂
Rich Responses inside the simulator
When I tested an imported agent recently, I noticed that rich responses are now visible inside the simulator. I don't know how recently they were introduced though.
The nice thing is, you can also test it for Facebook Messenger responses.
Update: OK, it looks like the ability to preview responses for different channels might have been around forever. I have never seen the Default Response itself show a rich response like what you see above, but then again, its possible I never played around with it till now so never triggered it.
I am still leaving this here (whether or not it is a recent update) as I think there are probably at least a few people who will discover this feature based on my GIF above.
Diagnostics Info for webhooks
I have already written about it in another article, but you now get much more structure information when you are testing your webhook responses.
Preview app in Google Assistant simulator
And of course a while back the Dialogflow team also added the ability to preview the app in Google Assistant simulator by clicking a link, although I believe this is quite well known by now (plus it is front and center).