Whistle Items
Items are fairly broad in their types. Each type has it's own properties and uses.
This page is for items that will act as if they were a Whistle.
Whistles are all items that have the following line;
"kind": "staxel.item.Whistle",
Whistles, currently, do not have any extra components when compared to Craft Items, but will activate the ability to use the item as if it was a Whistle. This item mainly interacts with Pets.
Creating a Whistle Item
Whistles are created in the exact same way as Craft Items. In fact you should follow the guide, Craft Items#Creating a Craft Item, just replace the "kind" property with "staxel.item.Whistle".
Spawning in a Whistle Item
Follow the guide at Craft Items#Spawning in a Craft Item. When that guide mentions "kind", make sure to use "staxel.item.Whistle" instead of "staxel.item.CraftItem" else you won't be able to spawn the item.
Config Options
The list of basic properties is included at Craft Items#Config Options.