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You will be presented with a new function for which you can define name and JSON schema. Here is an example of a JSON schema for a function get_current_weather that declares the fields location (string)and unit (string): 
{
  "type": "object",
  "properties": {
    "unit": {
      "type": "string",
      "description": "The temperature unit, e.g. Celsius"
    },
    "location": {
      "type": "string",
      "description": "The city and state, e.g. San Francisco, CA"
    }
  },
  "required": [
    "location",
    "unit"
  ]
}
The object defined here is based on JSON Schema. This framework allows for extensible definition that fit your ideal function definition.

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Field Details

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Type

Use here any of the valid JSON types: object, string, integer, number, array, etc… The top-level type will most commonly be an object holding other properties.
Learn more about all JSON types in the JSON Schema definition.

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Properties

Properties are definition of fields within an object. Here you can define any new variable. Nested properties are allowed.

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Required

The required array within an object defines which fields must be entered for a JSON payload to be validated.