Comment by int_19h

The problem is that it doesn't actually include the referenced file in the context. The model will only see what's in it if it deigns to read it, but that's not a given in all circumstances where it might need to.

I use this feature often in Claude to bring specific files so that they are in context at all times. E.g. when working on a parser, I will often put the grammar to be always in context. Or if working on a web app, all the model types.