I used a similar pattern. When ask AI to do a large implementation. I ask gemini-2.5-pro to write a very detailed overview implementation plan. Then review it. Then ask gemini-2.5-pro to split the plan into multiple stages and write detail implementation plan for each stage. Then I ask claude sonnat to read the overview plan and implement the stage n. I found that this is the only way to complete a major implementation with a relatively high success rate.