Types

Scalar types

• int stores a scoreboard integer.
• bool is an integer constrained to 0 or 1.
• str stores text in command storage.
• entity represents one selected entity.
• None represents absence in a nullable type.

Collection types

• list[T] is an ordered storage list.
• set[int], set[bool], and set[str] use keyed storage objects.
• set[entity] uses an entity tag.
• Nested types such as list[set[int]] are supported.

Type tests

Use x is int, x is bool, x is str, or x is list. Because boolean is a subset of integer, x is bool specifically checks whether the value is 0 or 1.

Nullable values

A nullable type may hold None. Singular entity selection uses @n semantics and a limit of one; a missing match becomes None when the type permits it.

Immutability

const values are fully immutable. readonly prevents reassignment while allowing the underlying value according to its declared collection rules.