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Tools are reusable functions that execute specific actions within your flows: querying APIs, performing calculations, updating data, or automating tasks. They run instantly, return a result, and can be used across multiple Workflows and projects. Jelou includes native Tools ready to use, but you can also create your own when you need something specific to your business.

In this guide you will build your first Tool: a simple function that queries the weather for a city and returns the temperature.
1

Create a new Tool

In the left panel of Brain Studio, go to the Tools tab and click to create a new Tool. Assign the name: Check Weather.
2

Drag an API node

On the canvas, drag an API node from the nodes panel. In the URL tab, enter:
url.txt
Under Variables, select or create an environment variable for your API key (mark it as secret if it contains credentials).
3

Configure the inputs

In the Tool configuration, add an input:
  • Name: city
  • Type: string
  • Required: Yes
Configure how this input is sent to the API node (for example, as a URL parameter: {{$input.city}}).
4

Configure the outputs

Define what information the Tool will return. In the outputs configuration, map:
  • temperature: Extract the value from the API response
  • description: Extract the weather description
These values will be available when you use the Tool in a Workflow.
5

Test your Tool

Use the testing functionality and enter a sample value, such as “Madrid”. Verify that the response is correct and that the outputs are mapped properly.
6

Publish the Tool

Click Publish. A version (v1.0.0) will be generated and it will become available for use in any project within your company.
And that’s it! You can now use this Tool in your Workflows by dragging it from the Tools panel and configuring the city input.