Comment by storystarling

I ran into similar issues with context rot on a larger backend project recently. I ended up writing a tool that parses the AST to strip out function bodies and only feeds the relevant signatures and type definitions into the prompt.

It cuts down the input tokens significantly which is nice for the monthly bill, but I found the main benefit is that it actually stops the model from getting distracted by existing implementation details. It feels a bit like overengineering but it makes reasoning about the system architecture much more reliable when you don't have to dump the whole codebase into the context window.