I don't think you really need a tool for that, you can just add something like "after the task is finished, have a subagent review the work in an adversarial fashion. If any defects, no matter how small are found, have another subagent implement the findings. Repeat this in a loop until all subagents achieve consensus that the product is of exceptional quality with no defects" or similar to each prompt. Each subagent gets its own, fresh, context window. No tooling required.