Selection Block Attributes

There is one part of selection blocks that was not mentioned in Rulesets, Selectors, and Selection Blocks

These are basically certain @attributes prefixed to the selection block, each one is described in the following sections.

@stage

This attribute can only be used on the outermost selection block (the one directly at the top level of the file). It is defined as follows @stage followed by the stage name for the selection block as a string.

Example:

@stage "example:post"
:parts {
    /* ... */
}

Stages are described in Stages

@require

This attribute conditionally enables the patch depending on the existence or non-existence of certain mods in the current installation. It is @require followed by a boolean expression (using and, or, and not) with the only values allowed being mod ids as strings. These mod ids resolve to true if the mod is installed otherwise false. If the expression resolves to true, the block is enabled, otherwise it is disabled.

This can be used at any nesting level of a patch block.

Example:

@require "life_support" and "resources" and not "super_life_support"
:parts {
    /* this patch will only run if the life support and resources mods are installed, but not if the super life support mod is */
}

@new

This attribute can only be used in the outermost selection block, and it is used to create new assets rather than patching assets, it takes a list of arguments in () after it, and these arguments do different things depending on the ruleset of the selection block it is attached to.

Ruleset	Argument names	Description of behaviour
`:parts`	`name`	Creates a new part asset of the name "name", it is recommended to use KSP2 Unity Tools to generate these patches.
`:resources`	`name`, `[is_recipe]`	Creates a new resource with "name", this resource is a recipe if `is_recipe` is passed and is true.
`:json`	`label`, `name`	Creates a new generic json asset in Addressables with the label `label`, and name `name`.

Examples:

// Create a generic json asset with the label "tests", and the name "test_1"
@new("test","test_1")
:json {
    some: "data";
    can: "go";
    in: "here";
}

// Create a new resource named stormlight
@new("Stormlight")
:resources {
    displayNameKey: "Resource/DisplayName/Stormlight";
    abbreviationKey: "Resource/Abbreviation/SL";
    isTweakable: true;
    isVisible: true;
    massPerUnit: 0;
    volumePerUnit: 0;
    specificHeatCapacityPerUnit: 2010;
    flowMode: 4;
    transferMode: 1;
    costPerUnit: 0.8;
    NonStageable: false;
    resourceIconAssetAddress: "";
    vfxFuelType: "Pressurized";
}

// Create a new recipe called ArgonEC
@new("ArgonEC", true)
:resources {
    displayNameKey: "Resource/DisplayName/Argon";
    abbreviationKey: "Resource/Abbreviation/Ar";
    +Argon {
        unitsPerRecipeUnit: 1;
    }
    +ElectricCharge {
        unitsPerRecipeUnit: 1;
    }
}

Last modified: 21 July 2025