A while ago, a HN comment linked to this blog by Mario Zechner https://mariozechner.at/posts/2025-06-02-prompts-are-code/ which was exactly what I needed back then. The workflow helped me analyse about 300 files. It definitely made up stuff along the way and missed valuable context that I would have seen had I done the analysis manually, but it's a good starting point.

Without a structured workflow, as you said, after 5 files, it's starts going berserk.

That said, Claude has been really bad the last few weeks, especially in VSCode Copilot. If you ask it repeatedly, it admits that's its Sonnet 3.5 and not Sonnet 4. Not sure if it's true, but Sonnets workflow has degraded the last few weeks.

You would get better results probably by using search and replace or a python script to make those changes.

The comments that insist you'd get better results by talking to it like you would to a human, I hope they're trolling. The idea that the tone of your prompt has any influence at all, is laughable.