Tools

In the bottom-left corner of the Langtail interface, you’ll find a button to enable the Tools panel. Click on it, and the Tools panel will appear on the right side of the screen.

Click on the “Plus Tool” button to add a new tool to your project.

In Langtail, you can create tools manually by providing a name, description, and specifying the required parameters in a structured format.

Alternatively, you can describe the tool’s functionality in plain text, and Langtail can generate the tool function structure for you using its AI capabilities.

Once you’ve added a tool, you can test it by providing sample user inputs. Langtail will evaluate the input and determine if the correct tool function should be called based on your prompt.

In the Tools panel, click on the “Plus Tool” button and manually create the get_weather tool function using the structure provided below. This is the definiton part.

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

Now lets add this to the handler part of the tool. Don’t forget to user your API key from the open weather.

export default execute(async (args, context) => {
const apiKey = 'd5d0be4cb42f683ef45a0e6b20bff763';
const city = args.location
const url = `https://api.openweathermap.org/data/2.5/weather?q=${city}&appid=${apiKey}&units=metric`;

const response = await fetch(url);
const data = await response.json();
return JSON.stringify(data)
})

In the input field, enter a query related to weather, such as “What should I wear today in San Francisco, CA?”

Langtail will analyze the input and determine if the get_weather tool should be called based on your prompt. If the evaluation is successful, you’ll see the tool function call displayed in the output, along with the correct response.