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Replace the scalar document_id discriminator on a coach conversation with a CoachConversationDocument join table and a sticky documentScoped flag, so a conversation can be grounded on several stored documents at once while the prompt-injection fence stays intact across the data-model change. The fence is re-established at both enforcement points, fail-closed: - Client: resolveCoachSendTarget routes any turn on a fenced conversation (or a fresh chat with staged attachments) to the new /api/insights/chat/fenced endpoint; the fenced body is strict and never carries scope, guided-question, or prefill hints. - Server: the tool route fetches with documentScoped:false AND 404s when the fetched row still carries an attachment (flag/join drift), emitting a fence_drift audit alarm. Document text now enters an LLM prompt in exactly one code path — the fenced pipeline — with no tools and no health snapshot; a module-graph test pins that the tool loop is unreachable from it. The fenced turn fences each document separately with a server-built, scrubbed header line (title and filename are untrusted text), runs a per-document egress consent check on the single picked provider, and grounds numerically over the live attachment union only. Attachments are capped at five documents and 192 KB of combined text with honest truncation. Attach and detach ride dedicated endpoints: attaching validates the document is owned, live, indexed, and within cap, then flips the conversation fenced (the one legal, privilege-reducing transition, audit-logged); detaching removes the document but never clears the flag. The document-sheet chat keeps its public wire contract and shares the same fenced pipeline over the join. Migration 0245 adds the join table and the flag, backfills every legacy single-document chat into a one-attachment fenced conversation, and drops the scalar column in the same transaction — no dual-truth window.
HealthLog API Spec
openapi.yaml is the canonical OpenAPI 3.1 description for the HealthLog
Next.js API. It is the source of truth for the native iOS client's
DTO codegen.
The MCP server is documented separately — it is a distinct contract over JSON-RPC, not part of the REST OpenAPI spec:
mcp-capabilities.md— the tool, resource, and prompt catalogue, the grounding contract, and the write model.mcp-skills.md— building a connector or skill on top of it.../self-hosting/mcp.md— enabling and connecting the surface (operator guide).
Preview locally
Open an interactive Redoc preview in your browser:
npx @redocly/cli preview docs/api/openapi.yaml
Generate static HTML for sharing:
npx @redocly/cli build-docs docs/api/openapi.yaml --output docs/api/index.html
Validate
npx @redocly/cli lint docs/api/openapi.yaml
The spec is expected to be lint-clean (errors = 0). Some warnings are intentional:
no-server-example.com—http://localhost:3000is the dev server.operation-2xx-response/operation-4xx-response— webhook + redirect endpoints intentionally omit one or the other.no-unused-components—ReminderPhaseis exposed for client codegen even though no path response references it directly.
Layout
info— title, version (mirrored frompackage.json), description.servers— productionhttps://healthlog.bombeck.ioplushttp://localhost:3000for local development.tags— domain groupings (Auth,Measurements,Medications,Mood,Dashboard,Insights,Achievements,DoctorReport,Integrations,User,Tokens,Notifications,Onboarding,Health,Settings,Analytics,Export,AuditLog,Monitoring,Webhooks,Ingest,Admin).securitySchemes:bearerAuth— long-livedhlk_*API tokens issued viaPOST /api/tokens. Required on/api/ingest/medication.sessionCookie— HttpOnlyhealthlog_sessioncookie set by the password and passkey login flows. Used by the web app and any iOS client running inside a web view.
components.schemas— DTOs for all routes plus the underlying Prisma models (e.g.Measurement,Medication,MedicationIntakeEvent,MoodEntry,User,DashboardLayout,ApiEnvelope,ApiError).paths— all routes fromsrc/app/api/**/route.ts, including the/api/admin/*family which is taggedAdminand marked internal.
Conventions
- Successful responses use the envelope
{ data, error: null }. - Error responses use the envelope
{ data: null, error: '<message>' }. - Pagination uses
limit+offsetquery parameters and ameta: { total, limit, offset }block on the response. - All timestamps are ISO 8601 / RFC 3339 (
format: date-time) in UTC. - IDs are CUIDs (opaque strings).
Updating the spec
When adding or changing routes:
- Update the relevant route handler under
src/app/api/**/route.ts. - Mirror the change in
openapi.yaml. KeepoperationIdcamelCase and stable — the iOS codegen keys off it. - Run
npx @redocly/cli lint docs/api/openapi.yamland resolve all errors. Warnings are tolerated when documented above. - Bump
info.versionif the change is breaking for clients.