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arananet

Sentia MCP Server

by arananet
OverviewSchemaSourceRelated ServersDiscussionsAdmin
JavaScript
Remote

Sentia

Cloudflare Workers JavaScript MCP OpenSpec License

"A 38 mm sensor patch that sends skin temperature, hydration and activity to the cloud through the Find My network and LoRaWAN, with no phone of its own and no cellular radio."

Sentia is a concept product built end to end with ANVIL, an open source software factory: spec first, tests before code, a factory run with its report kept in the repo. Sentia Patch One is not a medical device. It is a wellness and monitoring concept.

Live: https://sentia.info-693.workers.dev · MCP endpoint: https://sentia.info-693.workers.dev/mcp

The product

Sentia Patch One is a 38 mm adhesive sensor patch, 4.2 mm thick, worn on the upper arm or torso for up to 14 days. It measures skin temperature (thermistor array), hydration index 0 to 100 (bioimpedance), activity and posture (3 axis accelerometer) and sweat rate (microfluidic channel). It carries no GPS and no cellular modem.

Every few minutes the patch builds a tiny encrypted measurement digest:

  • In the city it broadcasts the digest inside rotating Bluetooth Low Energy advertisements in the Find My accessory pattern. Nearby Apple devices relay the opaque bytes to Apple; Sentia Cloud retrieves and decrypts the payloads addressed to it. Relays learn nothing.

  • Out of coverage it sends a full LoRaWAN Class A uplink (SF9, 125 kHz) to any gateway within kilometres, which forwards it through the network server to Sentia Cloud.

Battery logic: Bluetooth first because it is cheap, LoRaWAN only when no relay pattern is detected or on a schedule, and high value alerts escalate immediately. The server decodes, stores the time series, evaluates alert rules (fever trend, dehydration risk, fall impact, patch detached) and serves the site, the API and the MCP server.

Related MCP server: Kilo IoT Platform MCP Server

What is in the repo

Path

What it is

src/index.js

Worker router: site, /api/*, /mcp, SEO files

src/codec.js

The packet codec: 16 byte Find My digest, 19 byte LoRaWAN frame, crc8

src/data.js

Deterministic seeded data layer: 3 wearers, 24 h of series, alert rules

src/mcp.js

Sentia MCP Server: JSON-RPC 2.0, six tools

src/page.js, src/client.js

The single page site, live demo and dashboard

src/facts.js

One source of facts for the page, JSON-LD, llms.txt and docs

.openspec/specs/

OpenSpec specifications, written before the code

tests/

Node tests: codec, API, dashboard contract, MCP, live demo

evidence/

TDD evidence: the failing run, then the passing run

runs/, status/

The ANVIL factory run report and the generated status page

brand/BRAND.md

Naming, palette, typography and voice rules

API

Endpoint

Returns

GET /api/patches

The fleet of three patches with battery and last sync

GET /api/patches/:id

Status and current reading for one patch (404 JSON if unknown)

GET /api/patches/:id/measurements?hours=24

The time series, 15 minute spacing

GET /api/alerts

Alerts from the four rules, newest first

GET /api/network/stats

Uplink counts by path and relay type

Sentia MCP Server

POST /mcp speaks JSON-RPC 2.0 (protocol version 2024-11-05). Tools: list_patches, get_patch_status, get_measurements, get_alerts, get_network_stats, simulate_uplink. The last one returns the encoded payload and the decoded reading, so an assistant can demonstrate the whisper itself. The site carries a real request and response pair captured from the deployed endpoint.

Development

npm test        # 32 tests, node:test, no dependencies

Deploy (Cloudflare account of the maintainer):

wrangler deploy # worker name: sentia

The factory trail

Sentia was built as an end to end test of ANVIL. The trail is in the repo: scaffold, six specs under .openspec/specs/, TDD evidence in evidence/red.txt and evidence/green.txt, four reviewer records per spec under reviews/, the greenfield run for work order wo-sentia-001 under runs/ (verdict no_reviews in packet mode, human gate required and recorded), and the generated status page under status/.

Contributing (OpenSpec)

This project follows Spec-Driven Development with OpenSpec. Specs live under .openspec/specs/ and are written before implementation changes. A change starts as a spec delta with scenarios, lands with tests that reference the scenario ids, and keeps the factory gates green (anvil check). Please open an issue or a pull request on GitHub.

Documentation

Document

Description

brand/BRAND.md

Naming rules, palette, typography, voice

.openspec/specs/

The six capability specs

PIPELINES.md

The factory pipelines available to this project

status/index.html

Generated ANVIL status page for the build run

llms.txt

The product facts in llms.txt format

License

Apache 2.0. Copyright 2026 Eduardo Arana.

Developer

Eduardo Arana

ko-fi

This server cannot be deployed

One endpoint for every MCP toolRayrun runs every MCP server behind one URL and holds the credentials. Each call is decided per client, tool, and argument, then recorded.ray.runAd

Maintenance

ActivityMaintained
ResponsivenessUnresponsive

Resources

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