Problem with Conversational Agents session parameters - cloud function integration

[GabrielBaptista]

Hi, I'm trying to use the tool from playbook.
My tool is conected with a cloud function that returns a JSON list. 
All conections are OK and tested.

My issue is that I get the answer from there, but when I try to use this in my converstational agents chat I get no value. How can I solve this?

First I tried to set this variable via playbook prompt, then I use in my function the fulfillment_response stuff, setting up the parameter json_resp, but still not working.

My example calling my function and didn't setting the variable properly:

At that time, I've already had the values:

But, as you can see in the first image, the session parameter don't work.

Thanks