Question

A financial services company is building a GenAI workflow with AWS Step Functions that drafts loan rejection letters using a Bedrock foundation model. Regulatory policy requires that a compliance officer manually review and approve each generated letter before it is sent to the customer. The review can take anywhere from a few minutes to several business days. The team needs the Step Functions execution to pause after the draft is generated and resume only once a human explicitly approves or rejects the letter through an internal web portal. Which approach best implements this pause-and-resume behavior?

Accepted Answer

Use a Task state with the .waitForTaskToken integration pattern to invoke a Lambda that stores the draft and the task token, then have the web portal call SendTaskSuccess or SendTaskFailure when the officer decides.

Answer

Insert a Wait state configured with a fixed timeout of several days after the draft-generation Task, then automatically continue the workflow once the timer expires.

Answer

Use a synchronous Bedrock InvokeModel call inside a long-running Lambda that polls a DynamoDB approval table until the compliance officer updates the record.

Answer

Split the workflow into two separate Standard executions and rely on an EventBridge rule to trigger the second execution whenever the officer submits the portal form.