That sounds fine, but I wouldn't expect you'd still be at 2× to 3× then. Maybe closer to 1.2× to 1.3× (although studies seem to show it's more often actually 0.9×). Coding is already barely 10% of the work, the agents won't help much with the other parts, and now you have a whole load of additional things to check and potentially fix, which you didn't have to before because they're obvious to a human mind.