For example, you can do /file *.rs to load all of the rust files in your project into context.

Here is a simple but real example I used a while back:

"/file zed/crates/gpui/src/text_system.rs

I have a font I want to check if it exists on the system. I currently have a &'static str.

Is there something in here that will help me do that?"

I haven't interfaced with the lower level TextSystem that much, so rather than dig through 800 lines of code, I was able to instantly find `is_font_available()` and do what I needed to do.