I ask ChatGPT questions.
Most problems I work on are some form of building a declarative graph and then defining orchestrated operations on that graph. My understanding of how to structure and interact with that graph is usually the constraint. I have not found agents to help with improving the speed or quality of my understanding.
Eclipse with the Github Copilot plugin. Nice and simple, but it works.
I've been dabbling a bit with things like Codex and OpenCode, but I haven't really adopted any of them as a major part of my routine workflow so far. But time will tell.
And then sometimes I just ask coding related questions to Gemini or ChatGPT and copy & paste from the response, into my codebase, as indicated by the situation at hand.
My colleagues really like Claude code. I will need to find some time to experiment/transition to it.