Can't get responses for intents in dialogflow using custom payloads

I'm starting to use dialogflow in the google web interface, when I create intents from a text response it does works well, but if I try with the custom paylods I do not get a response.

E.G:

for the itent: "docker Get logs"

I have set as response:

{
  "richContent": [
    {
      "title": "test",
      "type": "description"
    }
  ]
}

But as response I get: "Not available"