Signal Effect

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Signal Effect

The Signal effect provides the following built-in operations, wired into the VM and runtime.

Operation	Signature	Description
Signal.wait	wait(name: String) -> Unit	Suspend the workflow until the named signal arrives, then resume with unit.

Implementation site: Runtime Host

Signal.wait suspends the actor only when called inside a workflow or durable actor with the runtime enabled. Outside a workflow context (e.g., in a standalone --eval script), it returns nil immediately.