Hey, thanks for the report. This is a known limitation of Agent Window in Cursor 3. LSP extensions like Pylance in your case aren’t fully integrated into the Agent Window environment yet, so completion providers can get stuck on loading… The same pattern shows up with TypeScript, C/C++, and other languages.
We’re already tracking this on our side along with other Glass and LSP issues like Go to Definition and keybindings. I can’t share an ETA for a fix yet. Once we have an update, we’ll post it in the megathread Cursor 3: Agents Window so you can follow the progress there.
For now, the workaround is to use the Editor Window for editing with autocomplete.