Looking at the code, it does have some sort of automatic discovery. I also don't know how scalable Claude Code is. I've spent over a decade thinking about code search, so I know what the limitations are for enterprise code.
One of the neat tricks that I've developed is, I would load all my backend code for my search component and then I would ask the LLM to trace a query and create a context bundle for only the files that are affected. Once the LLM has finished, I just need to do a few clicks to refine a 80,000 token size window down to about 20,000 tokens.
I would not be surprised if this is one of the tricks that it does as it is highly effective. Also, yes my tool is manual, but I treat conversations as durable asset so in the future, you should be able to say, last week I did this, load the same files and LLM will know what files to bring into context.