Same routines as the office box, same receipts, same checks. Nothing leaves this browser except two public reads from GitHub (the method page and the sample data, pinned to a commit) and the request to the model you choose — your key is sent only there and never to us. When you want the box somewhere else, pack its chain into an .egg and hatch it on a phone, a laptop, or a real box in your office. Everything here is the sample business; nothing of yours is read.
Nothing else to set up — the box works out the rest from the key.
The key goes only to that endpoint, straight from your device; we never see it. Anthropic keys work from here. A server on 127.0.0.1 needs no key at all.