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GD0108: The exported tool button is not in a tool class

Rule ID	GD0108
Category	Usage
Fix is breaking or non-breaking	Non-breaking
Enabled by default	Yes

Cause

A property is annotated with the [ExportToolButton] attribute in a class that is not annotated with the [Tool] attribute.

Rule description

The [ExportToolButton] is used to create clickable buttons in the inspector so, like every other script that runs in the editor, it needs to be annotated with the [Tool] attribute.

[Tool]
public partial class MyNode : Node
{
    [ExportToolButton("Click me!")]
    public Callable ClickMeButton => Callable.From(ClickMe);

    private static void ClickMe()
    {
        GD.Print("Hello world!");
    }
}

How to fix violations

To fix a violation of this rule, add the [Tool] attribute to the class that contains the member annotated with the [ExportToolButton] attribute.

When to suppress warnings

Do not suppress a warning from this rule. The clickable buttons in the inspector won't be functional if their script is not annotated with the [Tool] attribute.

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