in the case of tools like claudecode there's no copy/pasting. Claudecode updates files directly, runs tests, starts/stops server, everything else on its own (with your permission).

I guess to take it a step further, you can lay your requirements in order with guidance in a markdown file called 'myprogram.md'. Then tell ClaudeCode to read that file and do what it says. In that way, myprogram.md, actually your requirements doc, is the programming language being turned into the 1s and 0s the computer understands.