The Workflow SDK 5 beta now supports the standard and APIs across workflow and step boundaries.AbortControllerAbortSignal Create a controller inside a workflow, pass its signal into one or more steps, and cancel in-flight operations using the same API already uses.fetch That signal stays durable across suspensions and deterministic replay. When a step is running, it sees the cancellation, even when it's in a separate function invocation. Cancellation is also cooperative; steps have to inspect the signal or pass it to an API that supports .AbortSignal Use it to stop a slow step when a durable timeout wins a race, cancel the remaining requests after the first successful response, thread one signal through a multi-step pipeline, or cancel parallel work when an external condition changes.

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