Smart home demo

Interactive recreation of TypeSafe’s smart home assistant demo (see the Loom walkthrough).

Run the lab, then open http://127.0.0.1:7872/home.

What you see

Pane	Role
Command bar	Natural-language request + optional “talking to” device
Example chips	The same prompts as the official video
Smart Home	Rooms and devices. Mint = on / locked / climate running
Decision Trace	All ~13 questions from one call. Used answers are bright; speculative ones stay dim

Patterns

Speculative fan-out. “Turn off all of the lights” still asks what should happen to the locks, fans, speakers… Code reads only category, scope, device_type, and action.light.

Confidence gating. A plan’s confidence is the minimum over the Choice answers it consumed. Below 0.5 the UI asks before acting. Unlocking a door needs 0.85.

LLM pairing (heuristic here). is_compound > 0.5 splits the utterance into atomic commands (regex, no extra key). category == general gets a short canned reply — in TypeSafe’s original, that call is a generative model.

Offline vs live

No key: a keyword mock returns the same answer shape, so the house still moves.

TYPESAFE_API_KEY set: each Send is POST /v1/systemone with the real questions. The key never reaches the browser.

Homes

• 1BR — 10 devices (matches the video’s default)
• Family home — 19 devices, including Maya’s room and a patio (needed for “kid’s light” and “outside music”)