Is this good design of a workflow-esque system

public override IEnumerable<WorkItem> Workflow() {
    // These would probably be injected from elsewhere
    var db = new DB();
    var emailServer = new EmailServer();

    // other workitems here

    var ci = new FindLowInventoryItems(db);
    yield return ci;

    if (ci.LowInventoryItems.Any()) {
        var email = new SendEmailToWarehouse("Inventory is low.", ci.LowInventoryItems);
        yield return email;
    }

    // other workitems here
}