No, there’s the normal messages API which is what’s used to read files and deliver responses.

The author has identified a second endpoint which exfils your whole project folder, into a GCP storage bucket. Anyone who designs large scale distributed systems can tell this is to scoop up training data.

AFAIK, Cursor does some kind of indexing locally. So they don't have to upload all files, but can still search through them in order to find the relevant _parts_ that they upload so that the model can use them.