`GET /api/medications/{id}/glp1` resolved the caller as themselves while
the POST beside it has resolved the record since v1.37.0. A manager
inside a shared record could therefore add a titration step to a
medication whose history the same path refused them: may write, may not
read. No reading of the sharing model produces that shape, and the
sibling reads on the same medication — `/inventory`, `/side-effects`,
`/cadence` — have all resolved the record at READ level for releases.
The read joins them at that level rather than at the POST's MANAGE,
because it is strictly narrower than the write already admitted. The
module was already on both reviewed allowlists, so nothing is newly
delegable; its reason line said the module was reached through the
MANAGE arm alone, which is no longer true and now says so.
The gap survived this long because a route that refuses every switched
caller is indistinguishable from a route nobody classified. Three legs
close that: a delegate scoped to medications reads the owner's titration
history and still cannot reach their own medication, a delegate scoped
elsewhere is refused, and a caller who never switched is unchanged. Both
delegate legs assert the refusal CODE rather than the status, because the
pre-fix answer was also a 403 — verified by reverting the handler, at
which point the first leg reads 403 for 200 and the second reads
`sharing.not_permitted` for `sharing.access.denied`.
src/app/
The Next.js App Router tree: the page surfaces a logged-in user sees and the REST API under api/. Server components are the default; "use client" is added only where a hook, state, or browser API needs it. Routing is file-based — a page.tsx is a page, a route.ts is an API endpoint.
API routes (api/)
Every endpoint wraps its handler in apiHandler (@/lib/api-handler), parses any body with Zod safeParse, narrows userId from the session or Bearer token (never from the body), and returns the { data, error, meta? } envelope. requireAdmin() is cookie-only, so api/admin/ is unreachable by Bearer token. Notable groups:
auth/— login, register, password, passkey (WebAuthn), refresh, Codex device-OAuth.measurements/,mood-entries/,medications/,sleep/— the core health-data CRUD + batch/bulk ingest.ingest/— external Bearer-token ingest surfaces.insights/,analytics/,dashboard/— AI insights, the Coach SSE stream, trend summaries, the first-paint dashboard snapshot.withings/,whoop/,fitbit/,integrations/,sync/— OAuth connect/sync/webhook surfaces and the offline delta feed.fhir/,share-links/,doctor-report/,export/,import/— clinician-facing FHIR R4 read API, shareable records, report + data export.notifications/,devices/,send/,telegram/— channel registration, device tokens, dispatch, webhook intake.admin/— operator panel APIs (cookie-only).health/,version/,meta/,internal/— health check, build-version probe, runtime metadata, worker-internal routes.
Page surfaces
measurements/, medications/, mood/, insights/, achievements/, notifications/, settings/, onboarding/, admin/, plus the public about/, privacy/, bugreport/, the share-record route c/, and the root dashboard (page.tsx). Shared shell + chrome lives in layout.tsx; error.tsx / global-error.tsx / not-found.tsx / loading.tsx cover the framework boundaries. layout.tsx holds the one nonce-bound dangerouslySetInnerHTML (theme bootstrap).
Conventions
See ../../CLAUDE.md. The request-flow walk in .planning/codebase/arch.md annotates each layer with file:line citations. Related dirs: handlers compose ../lib/; pages render ../components/.