Vita Heart
The television an older parent already watches becomes their health room.
A Fire TV app on Vega OS for an older adult living alone, with the family on their phones,
Alexa+ in the loop, Ring sensors at the door, and a fleet of Strands agents on Amazon Bedrock
AgentCore behind it. Built for Build, Ship, Shape: Amazon Developer Hackathon (Fire TV track,
Alexa+ track, AWS Builder and Open Source mini challenges) by Tahsin Bayraktar, Graviti Labs.
Live API: https://rrjb1x8j2b.execute-api.eu-north-1.amazonaws.com · demo household AHMET1
| Surface | What it does | Where |
|---|
| Fire TV (Vega OS, React Native 0.83) | Morning Board, Medication Moment, Clock setup, Heart Session with live wrist heart rate, Family | tv/ |
| Phone pages | Photograph the boxes (/cabinet), family summary and replies (/family) | api/vitaheart/web/ |
| Apple Watch | Standalone watchOS app streaming heart rate into the TV's session | watch/ |
| Alexa+ | MCP server (spec 2025-11-25, Streamable HTTP, OAuth 2.1 PKCE), five tools, board card; simulated surface with browser voice at /alexa-sim | alexa/ |
| Ring | Signed webhooks, sensors normalised, Night Watch rules (door at night, quiet morning, cold indoors) | api/vitaheart/ring.py, api/vitaheart/night/ |
| AWS | Lambda + API Gateway, DynamoDB, S3, SNS, EventBridge; Strands agents on Bedrock AgentCore Runtime (Nova Lite reads, Claude writes) | api/, agents/, scripts/deploy.py |
Run it
# API and agents (Python 3.12+)
uv venv .venv && uv pip install --python .venv/bin/python -r api/requirements.txt -r agents/requirements.txt
.venv/bin/python -m pytest -q tests # 76 tests, no AWS needed (moto)
VITAHEART_LIVE=1 .venv/bin/python -m pytest -q tests # + live Bedrock / RxNorm / openFDA tests
cd api && ../.venv/bin/uvicorn vitaheart.app:asgi --reload # local API on :8000 (uses your AWS profile for DynamoDB)
# Television (Vega Developer Tools installed, Virtual Device running)
cd tv && npm install && npm test && npm run build:debug
vega run-app build/aarch64-debug/vitahearttv_aarch64.vpkg
# Cloud
.venv/bin/python scripts/deploy.py # Lambda, API Gateway, DynamoDB, S3, SNS, EventBridge (idempotent)
.venv/bin/agentcore deploy # the Strands fleet on AgentCore Runtime
.venv/bin/python scripts/demo_setup.py # the state the demo starts from
The TV's API URL lives in tv/src/config.ts; scripts/deploy.py writes the current one to docs/URLS.md.
How it fits together
- Every mutation lands on one events channel (
/events, long-poll). The TV, the family page and Alexa+ all read the same truth within a second. Lambda behind API Gateway cannot stream, so long-poll is used deliberately, not SSE.
- Medicines are read, then identified, then checked. Nova Lite reads what is printed (and must quote its own transcript, so a blank photo cannot become "Ibuprofen 200 mg"); RxNorm confirms identity through a Turkish-brand to INN bridge; openFDA supplies live recalls with lot numbers; dosing words become slots, and the household maps slots to its own clock on the TV once. Nothing invents 09:00.
- The fleet is Strands on AgentCore: Identifier, Watchman, Scribe (holds no tools, by design), Coach. Every tool call is written to a trace the TV and the family page show.
- Night Watch runs at 21:00 (EventBridge): Ring signals, doses, the check-in and the session become calm sentences for the family. The words alarm, monitor, detect and diagnose never appear.
- Alexa+: the MCP server runs inside the API; anonymous calls get a bare 401; tokens come from OAuth 2.1 PKCE where the "login" is the household code from the TV. Tool calls take 120 to 160 ms behind API Gateway.
Honesty notes
- Heart rate on the TV is labelled by source: live from your Watch, recorded session or test signal. Replays refuse to join a session with a different label.
- Ring events in the demo come from
scripts/ring_simulate.py, signed with the app's HMAC key exactly as Ring would sign them; the video says so.
- The Alexa+ MCP Toolkit is partner-only today; the surface at
/alexa-sim is the hackathon's sanctioned simulated path, and the MCP server behind it is real.
agents/vendored/ is copied from our VitaCabinet (Apache-2.0) with attribution; everything else was written during the submission window. Vita, our shipping iOS app, is not part of this submission.
More
docs/MASTER-PLAN.md (phases, judging map) · docs/TESTING.md (for judges) · docs/DECISIONS.md · docs/FRICTION-LOG.md · docs/PRODUCT-FEEDBACK.md
Apache-2.0.
