This post will focus mainly on Composer 2.5 in Cursor. These problems may not be present in opus-5.5 or gpt-6.1-sol-pro-max-ultra-thinking-fast. But gpt-6.1-luna, for example, has all the problems listed here. I’ve also encountered many of these problems before in gpt-5.5 and opus-4.6. I
Also, install the superpowers plugin. I’m not saying it’s always the best under all circumstances, but if you are new to agentic development and don’t know how to write your own system, it’s pretty good.