How do I define a schema when using function calling?

[oliverbj]

Hi!

First of all, great package. When I am using the workflow, I have defined an LLM step, and defined the response format to "JSON".

Now, I would like for it to refer to a function calling schema - example below:

{
  "name": "get_weather",
  "description": "Get the current weather in a given location",
  "input_schema": {
    "type": "object", 
    "properties": {
      "location": {
        "type": "string",
        "description": "The city and state, e.g. San Francisco, CA"
      },
      "unit": {
        "type": "string",
        "enum": ["celsius", "fahrenheit"],
        "description": "The unit of temperature, either 'celsius' or 'fahrenheit'"
      }
    },
    "required": ["location"]
  }
}

How can I incorporate this in the LLM object?