I tried this myself and IMO, this might be basic and day-to-day for you, with unambiguous correct paths to follow, but this is pretty niche nevertheless. LLMs thrive when there's a wealth of examples and I struggle to Google what you asked myself, meaning that LLM will perform even worse than my try.

I found that second line works well for image prompts too. Tell one AI to help you with a prompt, and then take it back to the others to generate images.

Is there a way to do this kind of design->critique->implement without switching tools? Like an end-to-end solution that consults multiple LLMs?

Claude code with Zen MCP. Kiro, but you don’t get a second LLM opinion.