Don't pay for the same step twice

Inngest’s rerun-from-step feature lets developers manually restart a completed workflow at a chosen step, preserving memoized outputs from earlier steps while re-executing only the selected step and those that follow. Unlike automatic retries, which occur after failures during an active run, this capability can be triggered after successful or failed runs through the dashboard, CLI, or REST API and can use edited step inputs. The feature is presented as especially useful for AI workflow development, where prompt tuning often requires repeated experimentation and full reruns unnecessarily repeat prior model calls. In an example involving three sequential model calls, rerunning only the final reply-generation step across ten iterations reduces illustrative costs from $15 to $6. Avoiding full reruns can also prevent duplicate external side effects such as emails or charges, conserve rate-limited API capacity, and eliminate delays caused by earlier wait steps. By managing state at the step level, the approach aims to make iterative workflow testing safer, faster, and less expensive without requiring extensive custom idempotency or bookkeeping logic.

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