Best Set Up for AI Coding?

I've had a lot of success making simple and medium scale programs (web based and python) using Claude & ChatGPT.

But my workflow is basically cut & paste from the web console (chatgpt or claude.ai), execute it, copy errors back in with direction, repeat.

I often have to ask for it to provide the full code each time, which can take multiple replies. Or it will provide a bunch of small bits of code I have to manually try and go insert.

I'm looking for both better methodology using my existing tools, or introduction to other tools which certainly must exist that are better suited.

I'd like to have something that can modify the existing code base directly and doesn't require me to cut and paste.

Ive bene using mostly HTML, PHP, Javascript & Python.

Thanks in advance for the help!