Maybe the LLM could issue queries to fetch parts of your codebase as it needs to look at them, using something like GDB or cscope.

Not _all_ the code. Just the relevant parts.

Play around with projects in Claude for an hour. You'll see.

Give it examples of the library being used in the way you need.

Here's an example transcript where I did that: https://gist.github.com/simonw/6a9f077bf8db616e44893a24ae1d3...

Thank you, I experimented in that direction as well.

But for my actual codebase, that is sadly not 100% clear code, it would require lots and lots of work, to give examples so it has enough of the right context, to work good enough.

While working I am jumping a lot between context and files. Where a LLM hopefully one day will be helpful, will be refactoring it all. But currently I would need to spend more time setting up context, than solving it myself.

With limited scope, like in your example - I do use LLMs regulary.