This is an excellent deep dive into building a Custom GPT to fix AI prompts. I love how it emphasizes that the quality of AI output starts with the input, and your strategies for prompt optimization, few-shot examples, and structured instructions are exactly what developers need. The section on reducing unnecessary calls and caching is especially practical—these decisions not only improve performance but also help with energy-efficient AI development. For anyone building GPT-based tools, this blog shows that a well-designed Custom GPT isn’t just a convenience—it’s a high-leverage productivity tool that also reduces overhead and infrastructure strain.