MyAtriumHealth via fpx

Atrium Health's patient portal is Epic MyChart at my.atriumhealth.org. Its web app talks to a clean JSON API, and this skill drives that same API through your signed-in browser tab.

Why the browser is required: every MyChart cookie is HttpOnly, so the session cannot be read or reproduced outside the browser, and login is MFA-gated. Requests are relayed through the tab; the session cookie is never extracted or stored.

This reads personal health information. It only ever touches the signed-in user's own account.

One-time setup

npm i -g @fetchproxy/cli          # also needs the ContextMint Bridge extension

ContextMint Bridge comes from https://github.com/nullnet-app/contextmint-bridge/releases (Chrome: load the chrome zip unpacked; use Chrome for now — Safari will ship inside the ContextMint app, which has no public download yet). It is the fetchproxy extension renamed, same maintainer; source is public there — build it, or verify a zip with shasum -a 256 -c <zip>.sha256.

Create the profile with its full scope declared up front — widening scope later invalidates the grant and forces a re-pair:

fpx profile add myatriumhealth --domain atriumhealth.org
fpx profile declare myatriumhealth \
  --cookie '_Host-MyChart_Session' \
  --cookie '__RequestVerificationToken_L215YXRyaXVtaGVhbHRo0' \
  --cookie '_Host-MyChartLocale' --cookie 'MYCPERS' --cookie 'p-MYC-LBPersistence' \
  --capture-header 'cookie@my.atriumhealth.org'

Then sign in to MyAtriumHealth in Chrome and run any command below. The first one prints a pair code — approve it in the ContextMint Bridge popup. The trust persists.

Use it

source references/mah.sh
mah_signed_in || echo "sign in to MyAtriumHealth in Chrome first"
export MAH_TOKEN="$(mah_token)"      # cache once per shell

mah_api allergies/LoadAllergies | jq '[.dataList[].allergyItem | {name, severe: .isSevere}]'

mah_api <area/Action> [json-body] posts to the modern api/… endpoints (body defaults to {}, which is all most of them need). mah_legacy <Area/Controller/Action> [querystring] handles the older form-encoded ones (visits).

Every call needs the ASP.NET antiforgery token — mah_token scrapes it from a signed-in page and the helpers attach it. Responses are large (test results 33 KB, medications 30 KB); always project with jq.

See references/endpoints.md for the full endpoint list with ready-to-run, live-verified jq recipes, and references/mah.sh for the helpers.

Check the session, not the status code

MyChart answers an expired session with HTTP 200 whose body is the login page, and the JSON endpoints then quietly return {}. A status check would report success forever. mah_signed_in tests the body — use it when results come back empty. Sessions are short-lived; expect to sign in again between uses.

There is a second, sneakier false green: an empty body. fetchproxy issues requests from inside a tab on the target host, so with no my.atriumhealth.org tab open it relays nothing — and empty text contains no login marker, so a naive "is this the login page?" check reports SIGNED IN for a response that never happened. mah_signed_in checks emptiness first and returns 2 with the real remedy (exit 1 means signed out, 0 means signed in).

Exit codes (fpx)

0 ok · 1 usage · 2 bridge unavailable (extension not connected, or pairing not approved) · 3 bot wall · 4 upstream HTTP error.

Data goes to stdout, pair codes and status to stderr — so | jq stays clean.

Messages

mah_messages [folderTag] reads the Message Center. It is the one endpoint that cannot be called with {}: it needs a five-key body whose PageNonce is the CSP nonce of an /app/* page, and whose externalLoadParams must list the non-local organizations only (filter api/conversations/GetOrganizations on the explicit isLocal flag — passing the local org returns HTTP 500). The helper handles all of that.

api/item-feed/FetchItemFeed still needs parameters that have not been captured.