Webhooks Values

Hi, Completely new to webhooks but had hit a issue with my code. 

I have set up a webhook that sends a notification that a new call is presented (This works fine)

I then have another Webhook that will tell me the status, the callers number and Handled by, The handled by is where I’m having an issue. I have successfully had #agent_username# work but only want to show agent full name.

Ive tried #agent_full_name# and #agent_first_name# #agent_last_name#

Does anyone have any suggest or a list of values that can be used.

Code below:

{
  "cardsV2": [
    {
      "cardId": "alert-001",
      "card": {
        "sections": [
          {
            "widgets": [
              {
                "decoratedText": {
                  "topLabel": "Alert Status",
                  "text": "<b>Call Answered</b>",
                  "startIcon": { "knownIcon": "PHONE" }
                }
              },
              {
                "decoratedText": {
                  "topLabel": "Caller Number",
                  "text": "#ani#",
                  "startIcon": { "knownIcon": "PERSON" }
                }
              },
              {
                "decoratedText": {
                  "topLabel": "Handled By",
                  "text": "#agent_first_name# #agent_last_name#",
                  "startIcon": { "knownIcon": "PERSON" }
                }
              }
            ]
          }
        ]
      }
    }
  ]
}