feat(caldav): add slot support for feed items

Adds three LLM-fillable slots to every CalDav feed item:
insight, preparation, and crossSource. Slot prompts are
stored in separate .txt files under src/prompts/ with
few-shot examples to steer the LLM away from restating
event details.

Co-authored-by: Ona <no-reply@ona.com>

.claude/skills/gpg-commit-signing/SKILL.md

@@ -0,0 +1,43 @@
+---
+name: gpg-commit-signing
+description: Sign git commits with GPG in non-interactive environments. Use when committing code and the `GPG_PRIVATE_KEY_PASSPHRASE` environment variable is available. Triggers on "commit", "sign commit", "GPG", "git commit -S", or any git operation requiring signed commits.
+---
+
+# GPG Commit Signing
+
+Sign commits in headless/non-interactive environments where `/dev/tty` is unavailable.
+
+## Workflow
+
+1. Check whether `GPG_PRIVATE_KEY_PASSPHRASE` is set:
+
+   ```bash
+   test -n "$GPG_PRIVATE_KEY_PASSPHRASE" && echo "available" || echo "not set"
+   ```
+
+   If not set, skip signing — commit without `-S`.
+
+2. Try a direct signed commit first — the environment may already have loopback pinentry configured:
+
+   ```bash
+   git commit -S -m "message"
+   ```
+
+   If this succeeds, no further steps are needed.
+
+3. If step 2 fails with a `/dev/tty` error, use `--pinentry-mode loopback` via a wrapper script:
+
+   ```bash
+   printf '#!/bin/sh\ngpg --batch --pinentry-mode loopback --passphrase "$GPG_PRIVATE_KEY_PASSPHRASE" "$@"\n' > /tmp/gpg-sign.sh
+   chmod +x /tmp/gpg-sign.sh
+   git -c gpg.program=/tmp/gpg-sign.sh commit -S -m "message"
+   rm /tmp/gpg-sign.sh
+   ```
+
+   This passes the passphrase directly to gpg on each signing invocation, bypassing the need for a configured gpg-agent.
+
+## Anti-patterns
+
+- Do not echo or log `GPG_PRIVATE_KEY_PASSPHRASE`.
+- Do not commit without `-S` when the passphrase is available — the project expects signed commits.
+- Do not leave wrapper scripts on disk after committing.

.devcontainer/devcontainer.json

@@ -11,12 +11,12 @@
 		"dockerfile": "Dockerfile"
 	},
 	"postCreateCommand": "bun install",
-	"postStartCommand": "./scripts/setup-git.sh && ./scripts/setup-nvim.sh"
+	"postStartCommand": "./scripts/setup-git.sh && ./scripts/setup-nvim.sh",
 	// Features add additional features to your environment. See https://containers.dev/features
 	// Beware: features are not supported on all platforms and may have unintended side-effects.
-	// "features": {
-	//   "ghcr.io/devcontainers/features/docker-in-docker": {
-	//     "moby": false
-	//   }
-	// }
+	"features": {
+		"ghcr.io/tailscale/codespace/tailscale": {
+			"version": "latest"
+		}
+	}
 }

.ona/automations.yaml

@@ -0,0 +1,8 @@
+services:
+  expo:
+    name: Expo Dev Server
+    description: Expo development server for aris-client
+    triggeredBy:
+      - postDevcontainerStart
+    commands:
+      start: cd apps/aris-client && ./scripts/run-dev-server.sh

apps/aris-backend/package.json

@@ -13,8 +13,6 @@
 		"@aris/source-location": "workspace:*",
 		"@aris/source-tfl": "workspace:*",
 		"@aris/source-weatherkit": "workspace:*",
-		"@hono/trpc-server": "^0.3",
-		"@trpc/server": "^11",
 		"arktype": "^2.1.29",
 		"better-auth": "^1",
 		"hono": "^4",

apps/aris-backend/src/auth/session-middleware.ts

@@ -1,13 +1,20 @@
-import type { Context, Next } from "hono"
+import type { Context, MiddlewareHandler, Next } from "hono"
+
+import type { AuthSession, AuthUser } from "./session.ts"
 
 import { auth } from "./index.ts"
 
-type SessionUser = typeof auth.$Infer.Session.user
-type Session = typeof auth.$Infer.Session.session
-
 export interface SessionVariables {
-	user: SessionUser | null
-	session: Session | null
+	user: AuthUser | null
+	session: AuthSession | null
+}
+
+export type AuthSessionEnv = { Variables: SessionVariables }
+
+export type AuthSessionMiddleware = MiddlewareHandler<AuthSessionEnv>
+
+declare module "hono" {
+	interface ContextVariableMap extends SessionVariables {}
 }
 
 /**
@@ -48,7 +55,22 @@ export async function requireSession(c: Context, next: Next): Promise<Response |
  */
 export async function getSessionFromHeaders(
 	headers: Headers,
-): Promise<{ user: SessionUser; session: Session } | null> {
+): Promise<{ user: AuthUser; session: AuthSession } | null> {
 	const session = await auth.api.getSession({ headers })
 	return session
 }
+
+/**
+ * Test-only middleware that injects a fake user and session.
+ * Pass userId to simulate an authenticated request, or omit to get 401.
+ */
+export function mockAuthSessionMiddleware(userId?: string): AuthSessionMiddleware {
+	return async (c: Context, next: Next): Promise<Response | void> => {
+		if (!userId) {
+			return c.json({ error: "Unauthorized" }, 401)
+		}
+		c.set("user", { id: userId } as AuthUser)
+		c.set("session", { id: "mock-session" } as AuthSession)
+		await next()
+	}
+}

apps/aris-backend/src/auth/session.ts

@@ -0,0 +1,4 @@
+import type { auth } from "./index.ts"
+
+export type AuthUser = typeof auth.$Infer.Session.user
+export type AuthSession = typeof auth.$Infer.Session.session

apps/aris-backend/src/feed/http.test.ts

@@ -0,0 +1,140 @@
+import type { ActionDefinition, ContextEntry, FeedItem, FeedSource } from "@aris/core"
+
+import { describe, expect, test } from "bun:test"
+import { Hono } from "hono"
+
+import { mockAuthSessionMiddleware } from "../auth/session-middleware.ts"
+import { UserSessionManager } from "../session/index.ts"
+import { registerFeedHttpHandlers } from "./http.ts"
+
+interface FeedResponse {
+	items: Array<{
+		id: string
+		type: string
+		priority: number
+		timestamp: string
+		data: Record<string, unknown>
+	}>
+	errors: Array<{ sourceId: string; error: string }>
+}
+
+function createStubSource(id: string, items: FeedItem[] = []): FeedSource {
+	return {
+		id,
+		async listActions(): Promise<Record<string, ActionDefinition>> {
+			return {}
+		},
+		async executeAction(): Promise<unknown> {
+			return undefined
+		},
+		async fetchContext(): Promise<readonly ContextEntry[] | null> {
+			return null
+		},
+		async fetchItems() {
+			return items
+		},
+	}
+}
+
+function buildTestApp(sessionManager: UserSessionManager, userId?: string) {
+	const app = new Hono()
+	registerFeedHttpHandlers(app, {
+		sessionManager,
+		authSessionMiddleware: mockAuthSessionMiddleware(userId),
+	})
+	return app
+}
+
+describe("GET /api/feed", () => {
+	test("returns 401 without auth", async () => {
+		const manager = new UserSessionManager([])
+		const app = buildTestApp(manager)
+
+		const res = await app.request("/api/feed")
+
+		expect(res.status).toBe(401)
+	})
+
+	test("returns cached feed when available", async () => {
+		const items: FeedItem[] = [
+			{
+				id: "item-1",
+				type: "test",
+				priority: 0.8,
+				timestamp: new Date("2025-01-01T00:00:00.000Z"),
+				data: { value: 42 },
+			},
+		]
+		const manager = new UserSessionManager([() => createStubSource("test", items)])
+		const app = buildTestApp(manager, "user-1")
+
+		// Prime the cache
+		const session = manager.getOrCreate("user-1")
+		await session.engine.refresh()
+		expect(session.engine.lastFeed()).not.toBeNull()
+
+		const res = await app.request("/api/feed")
+
+		expect(res.status).toBe(200)
+		const body = (await res.json()) as FeedResponse
+		expect(body.items).toHaveLength(1)
+		expect(body.items[0]!.id).toBe("item-1")
+		expect(body.items[0]!.type).toBe("test")
+		expect(body.items[0]!.priority).toBe(0.8)
+		expect(body.items[0]!.timestamp).toBe("2025-01-01T00:00:00.000Z")
+		expect(body.errors).toHaveLength(0)
+	})
+
+	test("forces refresh when no cached feed", async () => {
+		const items: FeedItem[] = [
+			{
+				id: "fresh-1",
+				type: "test",
+				priority: 0.5,
+				timestamp: new Date("2025-06-01T12:00:00.000Z"),
+				data: { fresh: true },
+			},
+		]
+		const manager = new UserSessionManager([() => createStubSource("test", items)])
+		const app = buildTestApp(manager, "user-1")
+
+		// No prior refresh — lastFeed() returns null, handler should call refresh()
+		const res = await app.request("/api/feed")
+
+		expect(res.status).toBe(200)
+		const body = (await res.json()) as FeedResponse
+		expect(body.items).toHaveLength(1)
+		expect(body.items[0]!.id).toBe("fresh-1")
+		expect(body.items[0]!.data.fresh).toBe(true)
+		expect(body.errors).toHaveLength(0)
+	})
+
+	test("serializes source errors as message strings", async () => {
+		const failingSource: FeedSource = {
+			id: "failing",
+			async listActions() {
+				return {}
+			},
+			async executeAction() {
+				return undefined
+			},
+			async fetchContext() {
+				return null
+			},
+			async fetchItems() {
+				throw new Error("connection timeout")
+			},
+		}
+		const manager = new UserSessionManager([() => failingSource])
+		const app = buildTestApp(manager, "user-1")
+
+		const res = await app.request("/api/feed")
+
+		expect(res.status).toBe(200)
+		const body = (await res.json()) as FeedResponse
+		expect(body.items).toHaveLength(0)
+		expect(body.errors).toHaveLength(1)
+		expect(body.errors[0]!.sourceId).toBe("failing")
+		expect(body.errors[0]!.error).toBe("connection timeout")
+	})
+})

apps/aris-backend/src/feed/http.ts

@@ -0,0 +1,41 @@
+import type { Context, Hono } from "hono"
+
+import { createMiddleware } from "hono/factory"
+
+import type { AuthSessionMiddleware } from "../auth/session-middleware.ts"
+import type { UserSessionManager } from "../session/index.ts"
+
+type Env = { Variables: { sessionManager: UserSessionManager } }
+
+interface FeedHttpHandlersDeps {
+	sessionManager: UserSessionManager
+	authSessionMiddleware: AuthSessionMiddleware
+}
+
+export function registerFeedHttpHandlers(
+	app: Hono,
+	{ sessionManager, authSessionMiddleware }: FeedHttpHandlersDeps,
+) {
+	const inject = createMiddleware<Env>(async (c, next) => {
+		c.set("sessionManager", sessionManager)
+		await next()
+	})
+
+	app.get("/api/feed", inject, authSessionMiddleware, handleGetFeed)
+}
+
+async function handleGetFeed(c: Context<Env>) {
+	const user = c.get("user")!
+	const sessionManager = c.get("sessionManager")
+	const session = sessionManager.getOrCreate(user.id)
+
+	const feed = session.engine.lastFeed() ?? (await session.engine.refresh())
+
+	return c.json({
+		items: feed.items,
+		errors: feed.errors.map((e) => ({
+			sourceId: e.sourceId,
+			error: e.error.message,
+		})),
+	})
+}

apps/aris-backend/src/location/http.ts

@@ -0,0 +1,56 @@
+import type { Context, Hono } from "hono"
+
+import { type } from "arktype"
+import { createMiddleware } from "hono/factory"
+
+import type { UserSessionManager } from "../session/index.ts"
+
+import { requireSession } from "../auth/session-middleware.ts"
+
+type Env = { Variables: { sessionManager: UserSessionManager } }
+
+const locationInput = type({
+	lat: "number",
+	lng: "number",
+	accuracy: "number",
+	timestamp: "string.date.iso",
+})
+
+export function registerLocationHttpHandlers(
+	app: Hono,
+	{ sessionManager }: { sessionManager: UserSessionManager },
+) {
+	const inject = createMiddleware<Env>(async (c, next) => {
+		c.set("sessionManager", sessionManager)
+		await next()
+	})
+
+	app.post("/api/location", inject, requireSession, handleUpdateLocation)
+}
+
+async function handleUpdateLocation(c: Context<Env>) {
+	let body: unknown
+	try {
+		body = await c.req.json()
+	} catch {
+		return c.json({ error: "Invalid JSON" }, 400)
+	}
+
+	const result = locationInput(body)
+
+	if (result instanceof type.errors) {
+		return c.json({ error: result.summary }, 400)
+	}
+
+	const user = c.get("user")!
+	const sessionManager = c.get("sessionManager")
+	const session = sessionManager.getOrCreate(user.id)
+	await session.engine.executeAction("aris.location", "update-location", {
+		lat: result.lat,
+		lng: result.lng,
+		accuracy: result.accuracy,
+		timestamp: new Date(result.timestamp),
+	})
+
+	return c.body(null, 204)
+}

apps/aris-backend/src/location/router.ts

@@ -1,28 +0,0 @@
-import { type } from "arktype"
-
-import type { UserSessionManager } from "../session/index.ts"
-import type { TRPC } from "../trpc/router.ts"
-
-const locationInput = type({
-	lat: "number",
-	lng: "number",
-	accuracy: "number",
-	timestamp: "Date",
-})
-
-export function createLocationRouter(
-	t: TRPC,
-	{ sessionManager }: { sessionManager: UserSessionManager },
-) {
-	return t.router({
-		update: t.procedure.input(locationInput).mutation(async ({ input, ctx }) => {
-			const session = sessionManager.getOrCreate(ctx.user.id)
-			await session.engine.executeAction("aris.location", "update-location", {
-				lat: input.lat,
-				lng: input.lng,
-				accuracy: input.accuracy,
-				timestamp: input.timestamp,
-			})
-		}),
-	})
-}

apps/aris-backend/src/server.ts

@@ -1,12 +1,12 @@
 import { LocationSource } from "@aris/source-location"
-import { trpcServer } from "@hono/trpc-server"
 import { Hono } from "hono"
 
 import { registerAuthHandlers } from "./auth/http.ts"
+import { requireSession } from "./auth/session-middleware.ts"
+import { registerFeedHttpHandlers } from "./feed/http.ts"
+import { registerLocationHttpHandlers } from "./location/http.ts"
 import { UserSessionManager } from "./session/index.ts"
 import { WeatherSourceProvider } from "./weather/provider.ts"
-import { createContext } from "./trpc/context.ts"
-import { createTRPCRouter } from "./trpc/router.ts"
 
 function main() {
 	const sessionManager = new UserSessionManager([
@@ -21,21 +21,13 @@ function main() {
 		}),
 	])
 
-	const trpcRouter = createTRPCRouter({ sessionManager })
-
 	const app = new Hono()
 
 	app.get("/health", (c) => c.json({ status: "ok" }))
 
 	registerAuthHandlers(app)
-
-	app.use(
-		"/trpc/*",
-		trpcServer({
-			router: trpcRouter,
-			createContext,
-		}),
-	)
+	registerFeedHttpHandlers(app, { sessionManager, authSessionMiddleware: requireSession })
+	registerLocationHttpHandlers(app, { sessionManager })
 
 	return app
 }

apps/aris-backend/src/session/user-session-manager.test.ts

@@ -1,11 +1,11 @@
+import type { WeatherKitClient, WeatherKitResponse } from "@aris/source-weatherkit"
+
 import { LocationSource } from "@aris/source-location"
 import { describe, expect, mock, test } from "bun:test"
 
 import { WeatherSourceProvider } from "../weather/provider.ts"
 import { UserSessionManager } from "./user-session-manager.ts"
 
-import type { WeatherKitClient, WeatherKitResponse } from "@aris/source-weatherkit"
-
 const mockWeatherClient: WeatherKitClient = {
 	fetch: async () => ({}) as WeatherKitResponse,
 }

apps/aris-backend/src/session/user-session-manager.ts

@@ -1,4 +1,5 @@
 import type { FeedSourceProviderInput } from "./feed-source-provider.ts"
+
 import { UserSession } from "./user-session.ts"
 
 export class UserSessionManager {

apps/aris-backend/src/session/user-session.test.ts

@@ -1,4 +1,4 @@
-import type { ActionDefinition, Context, FeedSource } from "@aris/core"
+import type { ActionDefinition, ContextEntry, FeedSource } from "@aris/core"
 
 import { LocationSource } from "@aris/source-location"
 import { describe, expect, test } from "bun:test"
@@ -14,7 +14,7 @@ function createStubSource(id: string): FeedSource {
 		async executeAction(): Promise<unknown> {
 			return undefined
 		},
-		async fetchContext(): Promise<Partial<Context> | null> {
+		async fetchContext(): Promise<readonly ContextEntry[] | null> {
 			return null
 		},
 		async fetchItems() {

apps/aris-backend/src/trpc/context.ts

@@ -1,14 +0,0 @@
-import type { FetchCreateContextFnOptions } from "@trpc/server/adapters/fetch"
-
-import { auth } from "../auth/index.ts"
-
-export async function createContext(opts: FetchCreateContextFnOptions) {
-	const session = await auth.api.getSession({ headers: opts.req.headers })
-
-	return {
-		user: session?.user ?? null,
-		session: session?.session ?? null,
-	}
-}
-
-export type Context = Awaited<ReturnType<typeof createContext>>

apps/aris-backend/src/trpc/router.ts

@@ -1,44 +0,0 @@
-import { initTRPC, TRPCError } from "@trpc/server"
-
-import type { UserSessionManager } from "../session/index.ts"
-import type { Context } from "./context.ts"
-
-import { createLocationRouter } from "../location/router.ts"
-
-export type TRPC = ReturnType<typeof createTRPC>
-
-export interface TRPCRouterDeps {
-	sessionManager: UserSessionManager
-}
-
-export function createTRPCRouter({ sessionManager }: TRPCRouterDeps) {
-	const t = createTRPC()
-
-	return t.router({
-		location: createLocationRouter(t, { sessionManager }),
-	})
-}
-
-export type TRPCRouter = ReturnType<typeof createTRPCRouter>
-
-function createTRPC() {
-	const t = initTRPC.context<Context>().create()
-
-	const isAuthed = t.middleware(({ ctx, next }) => {
-		if (!ctx.user || !ctx.session) {
-			throw new TRPCError({ code: "UNAUTHORIZED" })
-		}
-		return next({
-			ctx: {
-				user: ctx.user,
-				session: ctx.session,
-			},
-		})
-	})
-
-	return {
-		router: t.router,
-		procedure: t.procedure.use(isAuthed),
-	}
-}
-

apps/aris-client/.gitignore

@@ -0,0 +1,43 @@
+# Learn more https://docs.github.com/en/get-started/getting-started-with-git/ignoring-files
+
+# dependencies
+node_modules/
+
+# Expo
+.expo/
+dist/
+web-build/
+expo-env.d.ts
+
+# Native
+.kotlin/
+*.orig.*
+*.jks
+*.p8
+*.p12
+*.key
+*.mobileprovision
+
+# Metro
+.metro-health-check*
+
+# debug
+npm-debug.*
+yarn-debug.*
+yarn-error.*
+
+# macOS
+.DS_Store
+*.pem
+
+# local env files
+.env*.local
+
+# typescript
+*.tsbuildinfo
+
+app-example
+
+# generated native folders
+/ios
+/android

apps/aris-client/.vscode/extensions.json

@@ -0,0 +1 @@
+{ "recommendations": ["expo.vscode-expo-tools"] }

apps/aris-client/.vscode/settings.json

@@ -0,0 +1,7 @@
+{
+	"editor.codeActionsOnSave": {
+		"source.fixAll": "explicit",
+		"source.organizeImports": "explicit",
+		"source.sortMembers": "explicit"
+	}
+}

apps/aris-client/README.md

@@ -0,0 +1,50 @@
+# Welcome to your Expo app 👋
+
+This is an [Expo](https://expo.dev) project created with [`create-expo-app`](https://www.npmjs.com/package/create-expo-app).
+
+## Get started
+
+1. Install dependencies
+
+   ```bash
+   npm install
+   ```
+
+2. Start the app
+
+   ```bash
+   npx expo start
+   ```
+
+In the output, you'll find options to open the app in a
+
+- [development build](https://docs.expo.dev/develop/development-builds/introduction/)
+- [Android emulator](https://docs.expo.dev/workflow/android-studio-emulator/)
+- [iOS simulator](https://docs.expo.dev/workflow/ios-simulator/)
+- [Expo Go](https://expo.dev/go), a limited sandbox for trying out app development with Expo
+
+You can start developing by editing the files inside the **app** directory. This project uses [file-based routing](https://docs.expo.dev/router/introduction).
+
+## Get a fresh project
+
+When you're ready, run:
+
+```bash
+npm run reset-project
+```
+
+This command will move the starter code to the **app-example** directory and create a blank **app** directory where you can start developing.
+
+## Learn more
+
+To learn more about developing your project with Expo, look at the following resources:
+
+- [Expo documentation](https://docs.expo.dev/): Learn fundamentals, or go into advanced topics with our [guides](https://docs.expo.dev/guides).
+- [Learn Expo tutorial](https://docs.expo.dev/tutorial/introduction/): Follow a step-by-step tutorial where you'll create a project that runs on Android, iOS, and the web.
+
+## Join the community
+
+Join our community of developers creating universal apps.
+
+- [Expo on GitHub](https://github.com/expo/expo): View our open source platform and contribute.
+- [Discord community](https://chat.expo.dev): Chat with Expo users and ask questions.

apps/aris-client/app.json

@@ -0,0 +1,152 @@
+{
+	"expo": {
+		"name": "Aris",
+		"slug": "aris-client",
+		"version": "1.0.0",
+		"orientation": "portrait",
+		"icon": "./assets/images/icon.png",
+		"scheme": "aris",
+		"userInterfaceStyle": "automatic",
+		"newArchEnabled": true,
+		"ios": {
+			"infoPlist": {
+				"NSAppTransportSecurity": {
+					"NSAllowsArbitraryLoads": true
+				},
+				"ITSAppUsesNonExemptEncryption": false
+			},
+			"bundleIdentifier": "sh.nym.aris"
+		},
+		"android": {
+			"adaptiveIcon": {
+				"backgroundColor": "#E6F4FE",
+				"foregroundImage": "./assets/images/android-icon-foreground.png",
+				"backgroundImage": "./assets/images/android-icon-background.png",
+				"monochromeImage": "./assets/images/android-icon-monochrome.png"
+			},
+			"edgeToEdgeEnabled": true,
+			"predictiveBackGestureEnabled": false,
+			"package": "sh.nym.aris"
+		},
+		"web": {
+			"output": "static",
+			"favicon": "./assets/images/favicon.png"
+		},
+		"plugins": [
+			"expo-router",
+			[
+				"expo-splash-screen",
+				{
+					"image": "./assets/images/splash-icon.png",
+					"imageWidth": 200,
+					"resizeMode": "contain",
+					"backgroundColor": "#ffffff",
+					"dark": {
+						"backgroundColor": "#000000"
+					}
+				}
+			],
+			[
+				"expo-font",
+				{
+					"android": {
+						"fonts": [
+							{
+								"fontFamily": "Inter",
+								"fontDefinitions": [
+									{ "path": "./assets/fonts/Inter_100Thin.ttf", "weight": 100 },
+									{ "path": "./assets/fonts/Inter_100Thin_Italic.ttf", "weight": 100, "style": "italic" },
+									{ "path": "./assets/fonts/Inter_200ExtraLight.ttf", "weight": 200 },
+									{ "path": "./assets/fonts/Inter_200ExtraLight_Italic.ttf", "weight": 200, "style": "italic" },
+									{ "path": "./assets/fonts/Inter_300Light.ttf", "weight": 300 },
+									{ "path": "./assets/fonts/Inter_300Light_Italic.ttf", "weight": 300, "style": "italic" },
+									{ "path": "./assets/fonts/Inter_400Regular.ttf", "weight": 400 },
+									{ "path": "./assets/fonts/Inter_400Regular_Italic.ttf", "weight": 400, "style": "italic" },
+									{ "path": "./assets/fonts/Inter_500Medium.ttf", "weight": 500 },
+									{ "path": "./assets/fonts/Inter_500Medium_Italic.ttf", "weight": 500, "style": "italic" },
+									{ "path": "./assets/fonts/Inter_600SemiBold.ttf", "weight": 600 },
+									{ "path": "./assets/fonts/Inter_600SemiBold_Italic.ttf", "weight": 600, "style": "italic" },
+									{ "path": "./assets/fonts/Inter_700Bold.ttf", "weight": 700 },
+									{ "path": "./assets/fonts/Inter_700Bold_Italic.ttf", "weight": 700, "style": "italic" },
+									{ "path": "./assets/fonts/Inter_800ExtraBold.ttf", "weight": 800 },
+									{ "path": "./assets/fonts/Inter_800ExtraBold_Italic.ttf", "weight": 800, "style": "italic" },
+									{ "path": "./assets/fonts/Inter_900Black.ttf", "weight": 900 },
+									{ "path": "./assets/fonts/Inter_900Black_Italic.ttf", "weight": 900, "style": "italic" }
+								]
+							},
+							{
+								"fontFamily": "Source Serif 4",
+								"fontDefinitions": [
+									{ "path": "./assets/fonts/SourceSerif4_200ExtraLight.ttf", "weight": 200 },
+									{ "path": "./assets/fonts/SourceSerif4_200ExtraLight_Italic.ttf", "weight": 200, "style": "italic" },
+									{ "path": "./assets/fonts/SourceSerif4_300Light.ttf", "weight": 300 },
+									{ "path": "./assets/fonts/SourceSerif4_300Light_Italic.ttf", "weight": 300, "style": "italic" },
+									{ "path": "./assets/fonts/SourceSerif4_400Regular.ttf", "weight": 400 },
+									{ "path": "./assets/fonts/SourceSerif4_400Regular_Italic.ttf", "weight": 400, "style": "italic" },
+									{ "path": "./assets/fonts/SourceSerif4_500Medium.ttf", "weight": 500 },
+									{ "path": "./assets/fonts/SourceSerif4_500Medium_Italic.ttf", "weight": 500, "style": "italic" },
+									{ "path": "./assets/fonts/SourceSerif4_600SemiBold.ttf", "weight": 600 },
+									{ "path": "./assets/fonts/SourceSerif4_600SemiBold_Italic.ttf", "weight": 600, "style": "italic" },
+									{ "path": "./assets/fonts/SourceSerif4_700Bold.ttf", "weight": 700 },
+									{ "path": "./assets/fonts/SourceSerif4_700Bold_Italic.ttf", "weight": 700, "style": "italic" },
+									{ "path": "./assets/fonts/SourceSerif4_800ExtraBold.ttf", "weight": 800 },
+									{ "path": "./assets/fonts/SourceSerif4_800ExtraBold_Italic.ttf", "weight": 800, "style": "italic" },
+									{ "path": "./assets/fonts/SourceSerif4_900Black.ttf", "weight": 900 },
+									{ "path": "./assets/fonts/SourceSerif4_900Black_Italic.ttf", "weight": 900, "style": "italic" }
+								]
+							}
+						]
+					},
+					"ios": {
+						"fonts": [
+							"./assets/fonts/Inter_100Thin.ttf",
+							"./assets/fonts/Inter_100Thin_Italic.ttf",
+							"./assets/fonts/Inter_200ExtraLight.ttf",
+							"./assets/fonts/Inter_200ExtraLight_Italic.ttf",
+							"./assets/fonts/Inter_300Light.ttf",
+							"./assets/fonts/Inter_300Light_Italic.ttf",
+							"./assets/fonts/Inter_400Regular.ttf",
+							"./assets/fonts/Inter_400Regular_Italic.ttf",
+							"./assets/fonts/Inter_500Medium.ttf",
+							"./assets/fonts/Inter_500Medium_Italic.ttf",
+							"./assets/fonts/Inter_600SemiBold.ttf",
+							"./assets/fonts/Inter_600SemiBold_Italic.ttf",
+							"./assets/fonts/Inter_700Bold.ttf",
+							"./assets/fonts/Inter_700Bold_Italic.ttf",
+							"./assets/fonts/Inter_800ExtraBold.ttf",
+							"./assets/fonts/Inter_800ExtraBold_Italic.ttf",
+							"./assets/fonts/Inter_900Black.ttf",
+							"./assets/fonts/Inter_900Black_Italic.ttf",
+							"./assets/fonts/SourceSerif4_200ExtraLight.ttf",
+							"./assets/fonts/SourceSerif4_200ExtraLight_Italic.ttf",
+							"./assets/fonts/SourceSerif4_300Light.ttf",
+							"./assets/fonts/SourceSerif4_300Light_Italic.ttf",
+							"./assets/fonts/SourceSerif4_400Regular.ttf",
+							"./assets/fonts/SourceSerif4_400Regular_Italic.ttf",
+							"./assets/fonts/SourceSerif4_500Medium.ttf",
+							"./assets/fonts/SourceSerif4_500Medium_Italic.ttf",
+							"./assets/fonts/SourceSerif4_600SemiBold.ttf",
+							"./assets/fonts/SourceSerif4_600SemiBold_Italic.ttf",
+							"./assets/fonts/SourceSerif4_700Bold.ttf",
+							"./assets/fonts/SourceSerif4_700Bold_Italic.ttf",
+							"./assets/fonts/SourceSerif4_800ExtraBold.ttf",
+							"./assets/fonts/SourceSerif4_800ExtraBold_Italic.ttf",
+							"./assets/fonts/SourceSerif4_900Black.ttf",
+							"./assets/fonts/SourceSerif4_900Black_Italic.ttf"
+						]
+					}
+				}
+			]
+		],
+		"experiments": {
+			"typedRoutes": true,
+			"reactCompiler": true
+		},
+		"extra": {
+			"router": {},
+			"eas": {
+				"projectId": "61092d23-36aa-418e-929d-ea40dc912e8f"
+			}
+		}
+	}
+}

apps/aris-client/eas.json

@@ -0,0 +1,27 @@
+{
+	"cli": {
+		"version": ">= 18.0.1",
+		"appVersionSource": "remote"
+	},
+	"build": {
+		"development": {
+			"developmentClient": true,
+			"distribution": "internal"
+		},
+		"development-simulator": {
+			"extends": "development",
+			"ios": {
+				"simulator": "true"
+			}
+		},
+		"preview": {
+			"distribution": "internal"
+		},
+		"production": {
+			"autoIncrement": true
+		}
+	},
+	"submit": {
+		"production": {}
+	}
+}

apps/aris-client/eslint.config.js

@@ -0,0 +1,10 @@
+// https://docs.expo.dev/guides/using-eslint/
+const { defineConfig } = require("eslint/config")
+const expoConfig = require("eslint-config-expo/flat")
+
+module.exports = defineConfig([
+	expoConfig,
+	{
+		ignores: ["dist/*"],
+	},
+])

apps/aris-client/package.json

@@ -0,0 +1,57 @@
+{
+	"name": "aris-client",
+	"version": "1.0.0",
+	"private": true,
+	"main": "expo-router/entry",
+	"scripts": {
+		"start": "./scripts/run-dev-server.sh",
+		"reset-project": "node ./scripts/reset-project.js",
+		"android": "expo start --android",
+		"ios": "expo start --ios",
+		"web": "expo start --web",
+		"lint": "expo lint",
+		"build:ios": "eas build --profile development --platform ios --non-interactive",
+		"build:ios-simulator": "eas build --profile development-simulator --platform ios --non-interactive",
+		"debugger": "bun run scripts/open-debugger.ts"
+	},
+	"dependencies": {
+		"@expo-google-fonts/inter": "^0.4.2",
+		"@expo-google-fonts/source-serif-4": "^0.4.1",
+		"@expo/vector-icons": "^15.0.3",
+		"@react-navigation/bottom-tabs": "^7.4.0",
+		"@react-navigation/elements": "^2.6.3",
+		"@react-navigation/native": "^7.1.8",
+		"expo": "~54.0.33",
+		"expo-constants": "~18.0.13",
+		"expo-dev-client": "~6.0.20",
+		"expo-font": "~14.0.11",
+		"expo-haptics": "~15.0.8",
+		"expo-image": "~3.0.11",
+		"expo-linking": "~8.0.11",
+		"expo-location": "~19.0.8",
+		"expo-router": "~6.0.23",
+		"expo-splash-screen": "~31.0.13",
+		"expo-status-bar": "~3.0.9",
+		"expo-symbols": "~1.0.8",
+		"expo-system-ui": "~6.0.9",
+		"expo-web-browser": "~15.0.10",
+		"react": "19.1.0",
+		"react-dom": "19.1.0",
+		"react-native": "0.81.5",
+		"react-native-gesture-handler": "~2.28.0",
+		"react-native-reanimated": "~4.1.1",
+		"react-native-safe-area-context": "~5.6.0",
+		"react-native-screens": "~4.16.0",
+		"react-native-svg": "15.12.1",
+		"react-native-web": "~0.21.0",
+		"react-native-worklets": "0.5.1",
+		"twrnc": "^4.16.0"
+	},
+	"devDependencies": {
+		"@types/react": "~19.1.0",
+		"eas-cli": "^18.0.1",
+		"eslint": "^9.25.0",
+		"eslint-config-expo": "~10.0.0",
+		"typescript": "~5.9.2"
+	}
+}

apps/aris-client/scripts/dev-proxy.ts

@@ -0,0 +1,127 @@
+// Reverse proxy that sits in front of Metro so that all requests
+// (including those arriving via Tailscale or Ona port-forwarding) reach
+// Metro as loopback connections. This satisfies the isLocalSocket check
+// in Expo's debug middleware, making /debugger-frontend, /json, and
+// /open-debugger accessible from a remote browser.
+
+import type { ServerWebSocket } from "bun"
+
+const PROXY_PORT = parseInt(process.env.PROXY_PORT || "8080", 10)
+const METRO_PORT = parseInt(process.env.METRO_PORT || "8081", 10)
+const METRO_BASE = `http://127.0.0.1:${METRO_PORT}`
+
+function forwardHeaders(headers: Headers): Headers {
+	const result = new Headers(headers)
+	result.delete("origin")
+	result.delete("referer")
+	result.set("host", `127.0.0.1:${METRO_PORT}`)
+	return result
+}
+
+interface WsData {
+	upstream: WebSocket
+	isDevice: boolean
+}
+
+Bun.serve<WsData>({
+	port: PROXY_PORT,
+
+	async fetch(req, server) {
+		const url = new URL(req.url)
+
+		// WebSocket upgrade — bridge to Metro's ws endpoint
+		if (req.headers.get("upgrade")?.toLowerCase() === "websocket") {
+			const wsUrl = `ws://127.0.0.1:${METRO_PORT}${url.pathname}${url.search}`
+			const upstream = new WebSocket(wsUrl)
+
+			// Wait for upstream to connect before upgrading the client
+			try {
+				await new Promise<void>((resolve, reject) => {
+					upstream.addEventListener("open", () => resolve())
+					upstream.addEventListener("error", () => reject(new Error("upstream ws failed")))
+				})
+			} catch {
+				return new Response("Upstream WebSocket unavailable", { status: 502 })
+			}
+
+			const isDevice = url.pathname.startsWith("/inspector/device")
+			const ok = server.upgrade(req, { data: { upstream, isDevice } })
+			if (!ok) {
+				upstream.close()
+				return new Response("WebSocket upgrade failed", { status: 500 })
+			}
+			return undefined
+		}
+
+		// HTTP proxy
+		const upstream = `${METRO_BASE}${url.pathname}${url.search}`
+		const res = await fetch(upstream, {
+			method: req.method,
+			headers: forwardHeaders(req.headers),
+			body: req.body,
+			redirect: "manual",
+		})
+
+		return new Response(res.body, {
+			status: res.status,
+			statusText: res.statusText,
+			headers: res.headers,
+		})
+	},
+
+	websocket: {
+		message(ws: ServerWebSocket<WsData>, msg) {
+			ws.data.upstream.send(msg)
+		},
+		open(ws: ServerWebSocket<WsData>) {
+			const { upstream } = ws.data
+			upstream.addEventListener("message", (ev) => {
+				if (typeof ev.data === "string") {
+					ws.send(ev.data)
+				} else if (ev.data instanceof ArrayBuffer) {
+					ws.sendBinary(new Uint8Array(ev.data))
+				}
+			})
+			upstream.addEventListener("close", () => ws.close())
+			upstream.addEventListener("error", () => ws.close())
+
+			// Print debugger URL shortly after a device connects,
+			// giving Metro time to register the target.
+			if (ws.data.isDevice) {
+				setTimeout(() => printDebuggerUrl(), 1000)
+			}
+		},
+		close(ws: ServerWebSocket<WsData>) {
+			ws.data.upstream.close()
+		},
+	},
+})
+
+const tsIp = await Bun.$`tailscale ip -4`.text().then((s) => s.trim())
+
+async function printDebuggerUrl() {
+	const base = `http://${tsIp}:${PROXY_PORT}`
+	const res = await fetch(`${METRO_BASE}/json`)
+	if (!res.ok) return
+
+	interface DebugTarget {
+		webSocketDebuggerUrl: string
+		reactNative?: {
+			capabilities?: { prefersFuseboxFrontend?: boolean }
+		}
+	}
+
+	const targets: DebugTarget[] = await res.json()
+	const target = targets.find((t) => t.reactNative?.capabilities?.prefersFuseboxFrontend)
+	if (!target) return
+
+	const wsPath = target.webSocketDebuggerUrl
+		.replace(/^ws:\/\//, "")
+		.replace(`127.0.0.1:${METRO_PORT}`, `${tsIp}:${PROXY_PORT}`)
+
+	console.log(
+		`\n  React Native DevTools:\n  ${base}/debugger-frontend/rn_fusebox.html?ws=${encodeURIComponent(wsPath)}&sources.hide_add_folder=true&unstable_enableNetworkPanel=true\n`,
+	)
+}
+
+console.log(`[proxy] listening on :${PROXY_PORT}, forwarding to 127.0.0.1:${METRO_PORT}`)

apps/aris-client/scripts/open-debugger.ts

@@ -0,0 +1,52 @@
+// Opens React Native DevTools in Chrome, connected to the first
+// available Hermes debug target. Requires Metro + proxy to be running.
+
+import { $ } from "bun"
+
+const PROXY_PORT = process.env.PROXY_PORT || "8080"
+const METRO_PORT = process.env.METRO_PORT || "8081"
+const tsIp = (await $`tailscale ip -4`.text()).trim()
+const base = `http://${tsIp}:${PROXY_PORT}`
+
+interface DebugTarget {
+	devtoolsFrontendUrl: string
+	webSocketDebuggerUrl: string
+	reactNative?: {
+		capabilities?: {
+			prefersFuseboxFrontend?: boolean
+		}
+	}
+}
+
+const res = await fetch(`${base}/json`)
+if (!res.ok) {
+	console.error("Failed to fetch /json — is Metro running?")
+	process.exit(1)
+}
+
+const targets: DebugTarget[] = await res.json()
+const target = targets.find((t) => t.reactNative?.capabilities?.prefersFuseboxFrontend)
+
+if (!target) {
+	console.error("No debug target found. Is the app connected?")
+	process.exit(1)
+}
+
+const wsUrl = target.webSocketDebuggerUrl
+	.replace(/^ws:\/\//, "")
+	.replace(`127.0.0.1:${METRO_PORT}`, `${tsIp}:${PROXY_PORT}`)
+
+const url = `${base}/debugger-frontend/rn_fusebox.html?ws=${encodeURIComponent(wsUrl)}&sources.hide_add_folder=true&unstable_enableNetworkPanel=true`
+
+console.log(url)
+
+// Open in Chrome app mode if on macOS
+try {
+	await $`open -a "Google Chrome" --args --app=${url}`.quiet()
+} catch {
+	try {
+		await $`xdg-open ${url}`.quiet()
+	} catch {
+		console.log("Open the URL above in Chrome.")
+	}
+}

apps/aris-client/scripts/reset-project.js

@@ -0,0 +1,112 @@
+#!/usr/bin/env node
+
+/**
+ * This script is used to reset the project to a blank state.
+ * It deletes or moves the /app, /components, /hooks, /scripts, and /constants directories to /app-example based on user input and creates a new /app directory with an index.tsx and _layout.tsx file.
+ * You can remove the `reset-project` script from package.json and safely delete this file after running it.
+ */
+
+const fs = require("fs")
+const path = require("path")
+const readline = require("readline")
+
+const root = process.cwd()
+const oldDirs = ["app", "components", "hooks", "constants", "scripts"]
+const exampleDir = "app-example"
+const newAppDir = "app"
+const exampleDirPath = path.join(root, exampleDir)
+
+const indexContent = `import { Text, View } from "react-native";
+
+export default function Index() {
+  return (
+    <View
+      style={{
+        flex: 1,
+        justifyContent: "center",
+        alignItems: "center",
+      }}
+    >
+      <Text>Edit app/index.tsx to edit this screen.</Text>
+    </View>
+  );
+}
+`
+
+const layoutContent = `import { Stack } from "expo-router";
+
+export default function RootLayout() {
+  return <Stack />;
+}
+`
+
+const rl = readline.createInterface({
+	input: process.stdin,
+	output: process.stdout,
+})
+
+const moveDirectories = async (userInput) => {
+	try {
+		if (userInput === "y") {
+			// Create the app-example directory
+			await fs.promises.mkdir(exampleDirPath, { recursive: true })
+			console.log(`📁 /${exampleDir} directory created.`)
+		}
+
+		// Move old directories to new app-example directory or delete them
+		for (const dir of oldDirs) {
+			const oldDirPath = path.join(root, dir)
+			if (fs.existsSync(oldDirPath)) {
+				if (userInput === "y") {
+					const newDirPath = path.join(root, exampleDir, dir)
+					await fs.promises.rename(oldDirPath, newDirPath)
+					console.log(`➡️ /${dir} moved to /${exampleDir}/${dir}.`)
+				} else {
+					await fs.promises.rm(oldDirPath, { recursive: true, force: true })
+					console.log(`❌ /${dir} deleted.`)
+				}
+			} else {
+				console.log(`➡️ /${dir} does not exist, skipping.`)
+			}
+		}
+
+		// Create new /app directory
+		const newAppDirPath = path.join(root, newAppDir)
+		await fs.promises.mkdir(newAppDirPath, { recursive: true })
+		console.log("\n📁 New /app directory created.")
+
+		// Create index.tsx
+		const indexPath = path.join(newAppDirPath, "index.tsx")
+		await fs.promises.writeFile(indexPath, indexContent)
+		console.log("📄 app/index.tsx created.")
+
+		// Create _layout.tsx
+		const layoutPath = path.join(newAppDirPath, "_layout.tsx")
+		await fs.promises.writeFile(layoutPath, layoutContent)
+		console.log("📄 app/_layout.tsx created.")
+
+		console.log("\n✅ Project reset complete. Next steps:")
+		console.log(
+			`1. Run \`npx expo start\` to start a development server.\n2. Edit app/index.tsx to edit the main screen.${
+				userInput === "y"
+					? `\n3. Delete the /${exampleDir} directory when you're done referencing it.`
+					: ""
+			}`,
+		)
+	} catch (error) {
+		console.error(`❌ Error during script execution: ${error.message}`)
+	}
+}
+
+rl.question(
+	"Do you want to move existing files to /app-example instead of deleting them? (Y/n): ",
+	(answer) => {
+		const userInput = answer.trim().toLowerCase() || "y"
+		if (userInput === "y" || userInput === "n") {
+			moveDirectories(userInput).finally(() => rl.close())
+		} else {
+			console.log("❌ Invalid input. Please enter 'Y' or 'N'.")
+			rl.close()
+		}
+	},
+)

apps/aris-client/scripts/run-dev-server.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+PROXY_PORT=8080
+METRO_PORT=8081
+
+# Start a reverse proxy so Metro sees all requests as loopback.
+# This makes debugger endpoints (/debugger-frontend, /json, /open-debugger)
+# accessible through the Tailscale IP.
+PROXY_PORT=$PROXY_PORT METRO_PORT=$METRO_PORT bun run scripts/dev-proxy.ts &
+PROXY_PID=$!
+trap "kill $PROXY_PID 2>/dev/null" EXIT
+
+EXPO_PACKAGER_PROXY_URL=http://$(tailscale ip -4):$PROXY_PORT bunx expo start --localhost -p $METRO_PORT
+

apps/aris-client/src/app/(tabs)/_layout.tsx

@@ -0,0 +1,36 @@
+import { Tabs } from "expo-router"
+import React from "react"
+
+import { HapticTab } from "@/components/haptic-tab"
+import { IconSymbol } from "@/components/ui/icon-symbol"
+import { Colors } from "@/constants/theme"
+import { useColorScheme } from "@/hooks/use-color-scheme"
+
+export default function TabLayout() {
+	const colorScheme = useColorScheme()
+
+	return (
+		<Tabs
+			screenOptions={{
+				tabBarActiveTintColor: Colors[colorScheme ?? "light"].tint,
+				headerShown: false,
+				tabBarButton: HapticTab,
+			}}
+		>
+			<Tabs.Screen
+				name="index"
+				options={{
+					title: "Home",
+					tabBarIcon: ({ color }) => <IconSymbol size={28} name="house.fill" color={color} />,
+				}}
+			/>
+			<Tabs.Screen
+				name="explore"
+				options={{
+					title: "Explore",
+					tabBarIcon: ({ color }) => <IconSymbol size={28} name="paperplane.fill" color={color} />,
+				}}
+			/>
+		</Tabs>
+	)
+}

apps/aris-client/src/app/(tabs)/explore.tsx

@@ -0,0 +1,114 @@
+import { Image } from "expo-image"
+import { Platform, StyleSheet } from "react-native"
+
+import { ExternalLink } from "@/components/external-link"
+import ParallaxScrollView from "@/components/parallax-scroll-view"
+import { ThemedText } from "@/components/themed-text"
+import { ThemedView } from "@/components/themed-view"
+import { Collapsible } from "@/components/ui/collapsible"
+import { IconSymbol } from "@/components/ui/icon-symbol"
+import { Fonts } from "@/constants/theme"
+
+export default function TabTwoScreen() {
+	return (
+		<ParallaxScrollView
+			headerBackgroundColor={{ light: "#D0D0D0", dark: "#353636" }}
+			headerImage={
+				<IconSymbol
+					size={310}
+					color="#808080"
+					name="chevron.left.forwardslash.chevron.right"
+					style={styles.headerImage}
+				/>
+			}
+		>
+			<ThemedView style={styles.titleContainer}>
+				<ThemedText
+					type="title"
+					style={{
+						fontFamily: Fonts.rounded,
+					}}
+				>
+					Explore
+				</ThemedText>
+			</ThemedView>
+			<ThemedText>This app includes example code to help you get started.</ThemedText>
+			<Collapsible title="File-based routing">
+				<ThemedText>
+					This app has two screens:{" "}
+					<ThemedText type="defaultSemiBold">app/(tabs)/index.tsx</ThemedText> and{" "}
+					<ThemedText type="defaultSemiBold">app/(tabs)/explore.tsx</ThemedText>
+				</ThemedText>
+				<ThemedText>
+					The layout file in <ThemedText type="defaultSemiBold">app/(tabs)/_layout.tsx</ThemedText>{" "}
+					sets up the tab navigator.
+				</ThemedText>
+				<ExternalLink href="https://docs.expo.dev/router/introduction">
+					<ThemedText type="link">Learn more</ThemedText>
+				</ExternalLink>
+			</Collapsible>
+			<Collapsible title="Android, iOS, and web support">
+				<ThemedText>
+					You can open this project on Android, iOS, and the web. To open the web version, press{" "}
+					<ThemedText type="defaultSemiBold">w</ThemedText> in the terminal running this project.
+				</ThemedText>
+			</Collapsible>
+			<Collapsible title="Images">
+				<ThemedText>
+					For static images, you can use the <ThemedText type="defaultSemiBold">@2x</ThemedText> and{" "}
+					<ThemedText type="defaultSemiBold">@3x</ThemedText> suffixes to provide files for
+					different screen densities
+				</ThemedText>
+				<Image
+					source={require("@assets/images/react-logo.png")}
+					style={{ width: 100, height: 100, alignSelf: "center" }}
+				/>
+				<ExternalLink href="https://reactnative.dev/docs/images">
+					<ThemedText type="link">Learn more</ThemedText>
+				</ExternalLink>
+			</Collapsible>
+			<Collapsible title="Light and dark mode components">
+				<ThemedText>
+					This template has light and dark mode support. The{" "}
+					<ThemedText type="defaultSemiBold">useColorScheme()</ThemedText> hook lets you inspect
+					what the user&apos;s current color scheme is, and so you can adjust UI colors accordingly.
+				</ThemedText>
+				<ExternalLink href="https://docs.expo.dev/develop/user-interface/color-themes/">
+					<ThemedText type="link">Learn more</ThemedText>
+				</ExternalLink>
+			</Collapsible>
+			<Collapsible title="Animations">
+				<ThemedText>
+					This template includes an example of an animated component. The{" "}
+					<ThemedText type="defaultSemiBold">components/HelloWave.tsx</ThemedText> component uses
+					the powerful{" "}
+					<ThemedText type="defaultSemiBold" style={{ fontFamily: Fonts.mono }}>
+						react-native-reanimated
+					</ThemedText>{" "}
+					library to create a waving hand animation.
+				</ThemedText>
+				{Platform.select({
+					ios: (
+						<ThemedText>
+							The <ThemedText type="defaultSemiBold">components/ParallaxScrollView.tsx</ThemedText>{" "}
+							component provides a parallax effect for the header image.
+						</ThemedText>
+					),
+				})}
+			</Collapsible>
+		</ParallaxScrollView>
+	)
+}
+
+const styles = StyleSheet.create({
+	headerImage: {
+		color: "#808080",
+		bottom: -90,
+		left: -35,
+		position: "absolute",
+	},
+	titleContainer: {
+		flexDirection: "row",
+		gap: 8,
+	},
+})

apps/aris-client/src/app/(tabs)/index.tsx

@@ -0,0 +1,96 @@
+import { Image } from "expo-image"
+import { Link } from "expo-router"
+import { Platform, StyleSheet } from "react-native"
+
+import { HelloWave } from "@/components/hello-wave"
+import ParallaxScrollView from "@/components/parallax-scroll-view"
+import { ThemedText } from "@/components/themed-text"
+import { ThemedView } from "@/components/themed-view"
+
+export default function HomeScreen() {
+	return (
+		<ParallaxScrollView
+			headerBackgroundColor={{ light: "#A1CEDC", dark: "#1D3D47" }}
+			headerImage={
+				<Image source={require("@assets/images/partial-react-logo.png")} style={styles.reactLogo} />
+			}
+		>
+			<ThemedView style={styles.titleContainer}>
+				<ThemedText type="title">Welcome!</ThemedText>
+				<HelloWave />
+			</ThemedView>
+			<ThemedView style={styles.stepContainer}>
+				<ThemedText type="subtitle">Step 1: Try it</ThemedText>
+				<ThemedText>
+					Edit <ThemedText type="defaultSemiBold">app/(tabs)/index.tsx</ThemedText> to see changes.
+					Press{" "}
+					<ThemedText type="defaultSemiBold">
+						{Platform.select({
+							ios: "cmd + d",
+							android: "cmd + m",
+							web: "F12",
+						})}
+					</ThemedText>{" "}
+					to open developer tools.
+				</ThemedText>
+			</ThemedView>
+			<ThemedView style={styles.stepContainer}>
+				<Link href="/modal">
+					<Link.Trigger>
+						<ThemedText type="subtitle">Step 2: Explore</ThemedText>
+					</Link.Trigger>
+					<Link.Preview />
+					<Link.Menu>
+						<Link.MenuAction title="Action" icon="cube" onPress={() => alert("Action pressed")} />
+						<Link.MenuAction
+							title="Share"
+							icon="square.and.arrow.up"
+							onPress={() => alert("Share pressed")}
+						/>
+						<Link.Menu title="More" icon="ellipsis">
+							<Link.MenuAction
+								title="Delete"
+								icon="trash"
+								destructive
+								onPress={() => alert("Delete pressed")}
+							/>
+						</Link.Menu>
+					</Link.Menu>
+				</Link>
+
+				<ThemedText>
+					{`Tap the Explore tab to learn more about what's included in this starter app.`}
+				</ThemedText>
+			</ThemedView>
+			<ThemedView style={styles.stepContainer}>
+				<ThemedText type="subtitle">Step 3: Get a fresh start</ThemedText>
+				<ThemedText>
+					{`When you're ready, run `}
+					<ThemedText type="defaultSemiBold">npm run reset-project</ThemedText> to get a fresh{" "}
+					<ThemedText type="defaultSemiBold">app</ThemedText> directory. This will move the current{" "}
+					<ThemedText type="defaultSemiBold">app</ThemedText> to{" "}
+					<ThemedText type="defaultSemiBold">app-example</ThemedText>.
+				</ThemedText>
+			</ThemedView>
+		</ParallaxScrollView>
+	)
+}
+
+const styles = StyleSheet.create({
+	titleContainer: {
+		flexDirection: "row",
+		alignItems: "center",
+		gap: 8,
+	},
+	stepContainer: {
+		gap: 8,
+		marginBottom: 8,
+	},
+	reactLogo: {
+		height: 178,
+		width: 290,
+		bottom: 0,
+		left: 0,
+		position: "absolute",
+	},
+})

apps/aris-client/src/app/_layout.tsx

@@ -0,0 +1,23 @@
+import { DarkTheme, DefaultTheme, ThemeProvider } from "@react-navigation/native"
+import { Stack } from "expo-router"
+import { StatusBar } from "expo-status-bar"
+import "react-native-reanimated"
+import { useColorScheme } from "@/hooks/use-color-scheme"
+
+export const unstable_settings = {
+	anchor: "(tabs)",
+}
+
+export default function RootLayout() {
+	const colorScheme = useColorScheme()
+
+	return (
+		<ThemeProvider value={colorScheme === "dark" ? DarkTheme : DefaultTheme}>
+			<Stack>
+				<Stack.Screen name="(tabs)" options={{ headerShown: false }} />
+				<Stack.Screen name="modal" options={{ presentation: "modal", title: "Modal" }} />
+			</Stack>
+			<StatusBar style="auto" />
+		</ThemeProvider>
+	)
+}

apps/aris-client/src/app/modal.tsx

@@ -0,0 +1,29 @@
+import { Link } from "expo-router"
+import { StyleSheet } from "react-native"
+
+import { ThemedText } from "@/components/themed-text"
+import { ThemedView } from "@/components/themed-view"
+
+export default function ModalScreen() {
+	return (
+		<ThemedView style={styles.container}>
+			<ThemedText type="title">This is a modal</ThemedText>
+			<Link href="/" dismissTo style={styles.link}>
+				<ThemedText type="link">Go to home screen</ThemedText>
+			</Link>
+		</ThemedView>
+	)
+}
+
+const styles = StyleSheet.create({
+	container: {
+		flex: 1,
+		alignItems: "center",
+		justifyContent: "center",
+		padding: 20,
+	},
+	link: {
+		marginTop: 15,
+		paddingVertical: 15,
+	},
+})

apps/aris-client/src/components/external-link.tsx

@@ -0,0 +1,25 @@
+import { Href, Link } from "expo-router"
+import { openBrowserAsync, WebBrowserPresentationStyle } from "expo-web-browser"
+import { type ComponentProps } from "react"
+
+type Props = Omit<ComponentProps<typeof Link>, "href"> & { href: Href & string }
+
+export function ExternalLink({ href, ...rest }: Props) {
+	return (
+		<Link
+			target="_blank"
+			{...rest}
+			href={href}
+			onPress={async (event) => {
+				if (process.env.EXPO_OS !== "web") {
+					// Prevent the default behavior of linking to the default browser on native.
+					event.preventDefault()
+					// Open the link in an in-app browser.
+					await openBrowserAsync(href, {
+						presentationStyle: WebBrowserPresentationStyle.AUTOMATIC,
+					})
+				}
+			}}
+		/>
+	)
+}

apps/aris-client/src/components/haptic-tab.tsx

@@ -0,0 +1,18 @@
+import { BottomTabBarButtonProps } from "@react-navigation/bottom-tabs"
+import { PlatformPressable } from "@react-navigation/elements"
+import * as Haptics from "expo-haptics"
+
+export function HapticTab(props: BottomTabBarButtonProps) {
+	return (
+		<PlatformPressable
+			{...props}
+			onPressIn={(ev) => {
+				if (process.env.EXPO_OS === "ios") {
+					// Add a soft haptic feedback when pressing down on the tabs.
+					Haptics.impactAsync(Haptics.ImpactFeedbackStyle.Light)
+				}
+				props.onPressIn?.(ev)
+			}}
+		/>
+	)
+}

apps/aris-client/src/components/hello-wave.tsx

@@ -0,0 +1,20 @@
+import Animated from "react-native-reanimated"
+
+export function HelloWave() {
+	return (
+		<Animated.Text
+			style={{
+				fontSize: 28,
+				lineHeight: 32,
+				marginTop: -6,
+				animationName: {
+					"50%": { transform: [{ rotate: "25deg" }] },
+				},
+				animationIterationCount: 4,
+				animationDuration: "300ms",
+			}}
+		>
+			👋
+		</Animated.Text>
+	)
+}

apps/aris-client/src/components/parallax-scroll-view.tsx

@@ -0,0 +1,82 @@
+import type { PropsWithChildren, ReactElement } from "react"
+
+import { StyleSheet } from "react-native"
+import Animated, {
+	interpolate,
+	useAnimatedRef,
+	useAnimatedStyle,
+	useScrollOffset,
+} from "react-native-reanimated"
+
+import { ThemedView } from "@/components/themed-view"
+import { useColorScheme } from "@/hooks/use-color-scheme"
+import { useThemeColor } from "@/hooks/use-theme-color"
+
+const HEADER_HEIGHT = 250
+
+type Props = PropsWithChildren<{
+	headerImage: ReactElement
+	headerBackgroundColor: { dark: string; light: string }
+}>
+
+export default function ParallaxScrollView({
+	children,
+	headerImage,
+	headerBackgroundColor,
+}: Props) {
+	const backgroundColor = useThemeColor({}, "background")
+	const colorScheme = useColorScheme() ?? "light"
+	const scrollRef = useAnimatedRef<Animated.ScrollView>()
+	const scrollOffset = useScrollOffset(scrollRef)
+	const headerAnimatedStyle = useAnimatedStyle(() => {
+		return {
+			transform: [
+				{
+					translateY: interpolate(
+						scrollOffset.value,
+						[-HEADER_HEIGHT, 0, HEADER_HEIGHT],
+						[-HEADER_HEIGHT / 2, 0, HEADER_HEIGHT * 0.75],
+					),
+				},
+				{
+					scale: interpolate(scrollOffset.value, [-HEADER_HEIGHT, 0, HEADER_HEIGHT], [2, 1, 1]),
+				},
+			],
+		}
+	})
+
+	return (
+		<Animated.ScrollView
+			ref={scrollRef}
+			style={{ backgroundColor, flex: 1 }}
+			scrollEventThrottle={16}
+		>
+			<Animated.View
+				style={[
+					styles.header,
+					{ backgroundColor: headerBackgroundColor[colorScheme] },
+					headerAnimatedStyle,
+				]}
+			>
+				{headerImage}
+			</Animated.View>
+			<ThemedView style={styles.content}>{children}</ThemedView>
+		</Animated.ScrollView>
+	)
+}
+
+const styles = StyleSheet.create({
+	container: {
+		flex: 1,
+	},
+	header: {
+		height: HEADER_HEIGHT,
+		overflow: "hidden",
+	},
+	content: {
+		flex: 1,
+		padding: 32,
+		gap: 16,
+		overflow: "hidden",
+	},
+})

apps/aris-client/src/components/themed-text.tsx

@@ -0,0 +1,60 @@
+import { StyleSheet, Text, type TextProps } from "react-native"
+
+import { useThemeColor } from "@/hooks/use-theme-color"
+
+export type ThemedTextProps = TextProps & {
+	lightColor?: string
+	darkColor?: string
+	type?: "default" | "title" | "defaultSemiBold" | "subtitle" | "link"
+}
+
+export function ThemedText({
+	style,
+	lightColor,
+	darkColor,
+	type = "default",
+	...rest
+}: ThemedTextProps) {
+	const color = useThemeColor({ light: lightColor, dark: darkColor }, "text")
+
+	return (
+		<Text
+			style={[
+				{ color },
+				type === "default" ? styles.default : undefined,
+				type === "title" ? styles.title : undefined,
+				type === "defaultSemiBold" ? styles.defaultSemiBold : undefined,
+				type === "subtitle" ? styles.subtitle : undefined,
+				type === "link" ? styles.link : undefined,
+				style,
+			]}
+			{...rest}
+		/>
+	)
+}
+
+const styles = StyleSheet.create({
+	default: {
+		fontSize: 16,
+		lineHeight: 24,
+	},
+	defaultSemiBold: {
+		fontSize: 16,
+		lineHeight: 24,
+		fontWeight: "600",
+	},
+	title: {
+		fontSize: 32,
+		fontWeight: "bold",
+		lineHeight: 32,
+	},
+	subtitle: {
+		fontSize: 20,
+		fontWeight: "bold",
+	},
+	link: {
+		lineHeight: 30,
+		fontSize: 16,
+		color: "#0a7ea4",
+	},
+})

apps/aris-client/src/components/themed-view.tsx

@@ -0,0 +1,14 @@
+import { View, type ViewProps } from "react-native"
+
+import { useThemeColor } from "@/hooks/use-theme-color"
+
+export type ThemedViewProps = ViewProps & {
+	lightColor?: string
+	darkColor?: string
+}
+
+export function ThemedView({ style, lightColor, darkColor, ...otherProps }: ThemedViewProps) {
+	const backgroundColor = useThemeColor({ light: lightColor, dark: darkColor }, "background")
+
+	return <View style={[{ backgroundColor }, style]} {...otherProps} />
+}

apps/aris-client/src/components/ui/collapsible.tsx

@@ -0,0 +1,46 @@
+import { PropsWithChildren, useState } from "react"
+import { StyleSheet, TouchableOpacity } from "react-native"
+
+import { ThemedText } from "@/components/themed-text"
+import { ThemedView } from "@/components/themed-view"
+import { IconSymbol } from "@/components/ui/icon-symbol"
+import { Colors } from "@/constants/theme"
+import { useColorScheme } from "@/hooks/use-color-scheme"
+
+export function Collapsible({ children, title }: PropsWithChildren & { title: string }) {
+	const [isOpen, setIsOpen] = useState(false)
+	const theme = useColorScheme() ?? "light"
+
+	return (
+		<ThemedView>
+			<TouchableOpacity
+				style={styles.heading}
+				onPress={() => setIsOpen((value) => !value)}
+				activeOpacity={0.8}
+			>
+				<IconSymbol
+					name="chevron.right"
+					size={18}
+					weight="medium"
+					color={theme === "light" ? Colors.light.icon : Colors.dark.icon}
+					style={{ transform: [{ rotate: isOpen ? "90deg" : "0deg" }] }}
+				/>
+
+				<ThemedText type="defaultSemiBold">{title}</ThemedText>
+			</TouchableOpacity>
+			{isOpen && <ThemedView style={styles.content}>{children}</ThemedView>}
+		</ThemedView>
+	)
+}
+
+const styles = StyleSheet.create({
+	heading: {
+		flexDirection: "row",
+		alignItems: "center",
+		gap: 6,
+	},
+	content: {
+		marginTop: 6,
+		marginLeft: 24,
+	},
+})

apps/aris-client/src/components/ui/icon-symbol.ios.tsx

@@ -0,0 +1,32 @@
+import { SymbolView, SymbolViewProps, SymbolWeight } from "expo-symbols"
+import { StyleProp, ViewStyle } from "react-native"
+
+export function IconSymbol({
+	name,
+	size = 24,
+	color,
+	style,
+	weight = "regular",
+}: {
+	name: SymbolViewProps["name"]
+	size?: number
+	color: string
+	style?: StyleProp<ViewStyle>
+	weight?: SymbolWeight
+}) {
+	return (
+		<SymbolView
+			weight={weight}
+			tintColor={color}
+			resizeMode="scaleAspectFit"
+			name={name}
+			style={[
+				{
+					width: size,
+					height: size,
+				},
+				style,
+			]}
+		/>
+	)
+}

apps/aris-client/src/components/ui/icon-symbol.tsx

@@ -0,0 +1,41 @@
+// Fallback for using MaterialIcons on Android and web.
+
+import MaterialIcons from "@expo/vector-icons/MaterialIcons"
+import { SymbolWeight, SymbolViewProps } from "expo-symbols"
+import { ComponentProps } from "react"
+import { OpaqueColorValue, type StyleProp, type TextStyle } from "react-native"
+
+type IconMapping = Record<SymbolViewProps["name"], ComponentProps<typeof MaterialIcons>["name"]>
+type IconSymbolName = keyof typeof MAPPING
+
+/**
+ * Add your SF Symbols to Material Icons mappings here.
+ * - see Material Icons in the [Icons Directory](https://icons.expo.fyi).
+ * - see SF Symbols in the [SF Symbols](https://developer.apple.com/sf-symbols/) app.
+ */
+const MAPPING = {
+	"house.fill": "home",
+	"paperplane.fill": "send",
+	"chevron.left.forwardslash.chevron.right": "code",
+	"chevron.right": "chevron-right",
+} as IconMapping
+
+/**
+ * An icon component that uses native SF Symbols on iOS, and Material Icons on Android and web.
+ * This ensures a consistent look across platforms, and optimal resource usage.
+ * Icon `name`s are based on SF Symbols and require manual mapping to Material Icons.
+ */
+export function IconSymbol({
+	name,
+	size = 24,
+	color,
+	style,
+}: {
+	name: IconSymbolName
+	size?: number
+	color: string | OpaqueColorValue
+	style?: StyleProp<TextStyle>
+	weight?: SymbolWeight
+}) {
+	return <MaterialIcons color={color} size={size} name={MAPPING[name]} style={style} />
+}

apps/aris-client/src/constants/theme.ts

@@ -0,0 +1,53 @@
+/**
+ * Below are the colors that are used in the app. The colors are defined in the light and dark mode.
+ * There are many other ways to style your app. For example, [Nativewind](https://www.nativewind.dev/), [unistyles](https://reactnativeunistyles.vercel.app), etc.
+ */
+
+import { Platform } from "react-native"
+
+const tintColorLight = "#0a7ea4"
+const tintColorDark = "#fff"
+
+export const Colors = {
+	light: {
+		text: "#11181C",
+		background: "#fff",
+		tint: tintColorLight,
+		icon: "#687076",
+		tabIconDefault: "#687076",
+		tabIconSelected: tintColorLight,
+	},
+	dark: {
+		text: "#ECEDEE",
+		background: "#151718",
+		tint: tintColorDark,
+		icon: "#9BA1A6",
+		tabIconDefault: "#9BA1A6",
+		tabIconSelected: tintColorDark,
+	},
+}
+
+export const Fonts = Platform.select({
+	ios: {
+		/** iOS `UIFontDescriptorSystemDesignDefault` */
+		sans: "system-ui",
+		/** iOS `UIFontDescriptorSystemDesignSerif` */
+		serif: "ui-serif",
+		/** iOS `UIFontDescriptorSystemDesignRounded` */
+		rounded: "ui-rounded",
+		/** iOS `UIFontDescriptorSystemDesignMonospaced` */
+		mono: "ui-monospace",
+	},
+	default: {
+		sans: "normal",
+		serif: "serif",
+		rounded: "normal",
+		mono: "monospace",
+	},
+	web: {
+		sans: "system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif",
+		serif: "Georgia, 'Times New Roman', serif",
+		rounded: "'SF Pro Rounded', 'Hiragino Maru Gothic ProN', Meiryo, 'MS PGothic', sans-serif",
+		mono: "SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace",
+	},
+})

apps/aris-client/src/hooks/use-color-scheme.ts

@@ -0,0 +1 @@
+export { useColorScheme } from "react-native"

apps/aris-client/src/hooks/use-color-scheme.web.ts

@@ -0,0 +1,21 @@
+import { useEffect, useState } from "react"
+import { useColorScheme as useRNColorScheme } from "react-native"
+
+/**
+ * To support static rendering, this value needs to be re-calculated on the client side for web
+ */
+export function useColorScheme() {
+	const [hasHydrated, setHasHydrated] = useState(false)
+
+	useEffect(() => {
+		setHasHydrated(true)
+	}, [])
+
+	const colorScheme = useRNColorScheme()
+
+	if (hasHydrated) {
+		return colorScheme
+	}
+
+	return "light"
+}

apps/aris-client/src/hooks/use-theme-color.ts

@@ -0,0 +1,21 @@
+/**
+ * Learn more about light and dark modes:
+ * https://docs.expo.dev/guides/color-schemes/
+ */
+
+import { Colors } from "@/constants/theme"
+import { useColorScheme } from "@/hooks/use-color-scheme"
+
+export function useThemeColor(
+	props: { light?: string; dark?: string },
+	colorName: keyof typeof Colors.light & keyof typeof Colors.dark,
+) {
+	const theme = useColorScheme() ?? "light"
+	const colorFromProps = props[theme]
+
+	if (colorFromProps) {
+		return colorFromProps
+	} else {
+		return Colors[theme][colorName]
+	}
+}

apps/aris-client/tsconfig.json

@@ -0,0 +1,11 @@
+{
+	"extends": "expo/tsconfig.base",
+	"compilerOptions": {
+		"strict": true,
+		"paths": {
+			"@/*": ["./src/*"],
+			"@assets/*": ["./assets/*"]
+		}
+	},
+	"include": ["**/*.ts", "**/*.tsx", ".expo/types/**/*.ts", "expo-env.d.ts"]
+}

docs/architecture-draft.md

@@ -16,8 +16,8 @@ Examples of feed items:
 ## Design Principles
 
 1. **Extensibility**: The core must support different data sources, including third-party sources.
-2. **Separation of concerns**: Core handles data only. UI rendering is a separate system.
-3. **Parallel execution**: Sources run in parallel; no inter-source dependencies.
+2. **Separation of concerns**: Core handles data and UI description. The client is a thin renderer.
+3. **Dependency graph**: Sources declare dependencies on other sources. The engine resolves the graph and runs independent sources in parallel.
 4. **Graceful degradation**: Failed sources are skipped; partial results are returned.
 
 ## Architecture
@@ -25,26 +25,28 @@ Examples of feed items:
 ```
 ┌─────────────────────────────────────────────────────────────┐
 │                         Backend                              │
-│  ┌─────────────┐    ┌─────────────┐    ┌─────────────────┐  │
-│  │  aris-core  │    │   Sources   │    │  UI Registry    │  │
-│  │             │    │  (plugins)  │    │  (schemas from  │  │
-│  │ - Reconciler│◄───│ - Calendar  │    │   third parties)│  │
-│  │ - Context   │    │ - Weather   │    │                 │  │
-│  │ - FeedItem  │    │ - Spotify   │    │                 │  │
-│  └─────────────┘    └─────────────┘    └─────────────────┘  │
-│         │                                      │             │
-│         ▼                                      ▼             │
-│    Feed (data only)                    UI Schemas (JSON)     │
+│  ┌─────────────┐    ┌─────────────┐                         │
+│  │  aris-core  │    │   Sources   │                         │
+│  │             │    │  (plugins)  │                         │
+│  │ - FeedEngine│◄───│ - Calendar  │                         │
+│  │ - Context   │    │ - Weather   │                         │
+│  │ - FeedItem  │    │ - TfL       │                         │
+│  │ - Actions   │    │ - Spotify   │                         │
+│  └─────────────┘    └─────────────┘                         │
+│         │                                                    │
+│         ▼                                                    │
+│    Feed items (data + ui trees + slots)                      │
 └─────────────────────────────────────────────────────────────┘
-                    │                           │
-                    ▼                           ▼
+                    │
+                    ▼ (WebSocket / JSON-RPC)
 ┌─────────────────────────────────────────────────────────────┐
-│                        Frontend                              │
+│                    Client (React Native)                      │
 │  ┌──────────────────────────────────────────────────────┐   │
-│  │  Renderer                                             │   │
-│  │  - Receives feed items                                │   │
-│  │  - Fetches UI schema by item type                     │   │
-│  │  - Renders using json-render or similar               │   │
+│  │  json-render + twrnc component map                    │   │
+│  │  - Receives feed items with ui trees                  │   │
+│  │  - Renders using registered RN components + twrnc     │   │
+│  │  - User interactions trigger source actions           │   │
+│  │  - Bespoke native components for rich interactions    │   │
 │  └──────────────────────────────────────────────────────┘   │
 └─────────────────────────────────────────────────────────────┘
 ```
@@ -54,15 +56,16 @@ Examples of feed items:
 The core is responsible for:
 
 - Defining the context and feed item interfaces
-- Providing a reconciler that orchestrates data sources
+- Providing a `FeedEngine` that orchestrates sources via a dependency graph
 - Returning a flat list of prioritized feed items
+- Routing action execution to the correct source
 
 ### Key Concepts
 
-- **Context**: Time and location (with accuracy) passed to all sources
-- **FeedItem**: Has an ID (source-generated, stable), type, priority, timestamp, and JSON-serializable data
-- **DataSource**: Interface that third parties implement to provide feed items
-- **Reconciler**: Orchestrates sources, runs them in parallel, returns items and any errors
+- **Context**: Time and location (with accuracy) passed to all sources. Sources can contribute to context (e.g., location source provides coordinates, weather source provides conditions).
+- **FeedItem**: Has an ID (source-generated, stable), type, timestamp, JSON-serializable data, optional actions, an optional `ui` tree, and optional `slots` for LLM-fillable content.
+- **FeedSource**: Interface that first and third parties implement to provide context, feed items, and actions. Uses reverse-domain IDs (e.g., `aris.weather`, `com.spotify`).
+- **FeedEngine**: Orchestrates sources respecting their dependency graph, runs independent sources in parallel, returns items and any errors. Routes action execution to the correct source.
 
 ## Data Sources
 
@@ -71,10 +74,13 @@ Key decisions:
 - Sources receive the full context and decide internally what to use
 - Each source returns a single item type (e.g., separate "Calendar Source" and "Location Suggestion Source" rather than a combined "Google Source")
 - Sources live in separate packages, not in the core
+- Sources declare dependencies on other sources (e.g., weather depends on location)
 - Sources are responsible for:
   - Transforming their domain data into feed items
   - Assigning priority based on domain logic (e.g., "event starting in 10 minutes" = high priority)
   - Returning empty arrays when nothing is relevant
+  - Providing a `ui` tree for each feed item
+  - Declaring and handling actions (e.g., RSVP, complete task, play/pause)
 
 ### Configuration
 
@@ -83,28 +89,323 @@ Configuration is passed at source registration time, not per reconcile call. Sou
 ## Feed Output
 
 - Flat list of `FeedItem` objects
-- No UI information (no icons, card types, etc.)
+- Items carry data, an optional `ui` field describing their layout, and optional `slots` for LLM enhancement
 - Items are a discriminated union by `type` field
-- Reconciler sorts by priority; can act as tiebreaker
 
-## UI Rendering (Separate from Core)
+## UI Rendering: Server-Driven UI
 
-The core does not handle UI. For extensible third-party UI:
+The UI for feed items is **server-driven**. Sources describe how their items look using a JSON tree (the `ui` field on `FeedItem`). The client renders these trees using [json-render](https://json-render.dev/) with a registered set of React Native components styled via [twrnc](https://github.com/jaredh159/tailwind-react-native-classnames).
 
-1. Third-party apps register their UI schemas through the backend (UI Registry)
-2. Frontend fetches UI schemas from the backend
-3. Frontend matches feed items to schemas by `type` and renders accordingly
+### How it works
 
-This approach:
+1. Sources return feed items with a `ui` field — a JSON tree describing the card layout using Tailwind class strings.
+2. The client passes a component map to json-render. Each component wraps a React Native primitive and resolves `className` via twrnc.
+3. json-render walks the tree and renders native components. twrnc parses Tailwind classes at runtime — no build step, arbitrary values work.
+4. User interactions (tap, etc.) map to source actions via the `actions` field on `FeedItem`. The client sends action requests to the backend, which routes them to the correct source via `FeedEngine.executeAction()`.
 
-- Keeps the core focused on data
-- Works across platforms (web, React Native)
-- Avoids the need for third parties to inject code into the app
-- Uses a json-render style approach for declarative UI from JSON schemas
+### Styling
 
-Reference: https://github.com/vercel-labs/json-render
+- Sources use Tailwind CSS class strings via the `className` prop (e.g., `"p-4 bg-white dark:bg-black rounded-xl"`).
+- twrnc resolves classes to React Native style objects at runtime. Supports arbitrary values (`mt-[31px]`, `bg-[#eaeaea]`), dark mode (`dark:bg-black`), and platform prefixes (`ios:pt-4 android:pt-2`).
+- Custom colors and spacing are configured via `tailwind.config.js` on the client.
+- No compile-time constraint — all styles resolve at runtime.
+
+### Two tiers of UI
+
+- **Server-driven (default):** Any source can return a `ui` tree. Covers most cards — weather, tasks, alerts, package tracking, news, etc. Simple interactions go through source actions. This is the default path for both first-party and third-party sources.
+- **Bespoke native:** For cards that need rich client interaction (gestures, animations, real-time updates), a native React Native component is registered in the json-render component map and referenced by type. Third parties that need this level of richness work with the ARIS team to get it integrated.
+
+### Why server-driven
+
+- Feed items are inherently server-driven — the data comes from sources on the backend. Attaching the layout alongside the data is a natural extension.
+- Card designs can be updated without shipping an app update.
+- Third-party sources can ship their own UI without bundling anything new into the app.
+
+Reference: https://json-render.dev/
+
+## Feed Items with UI and Slots
+
+> Note: the codebase has evolved since the sections above. The engine now uses a dependency graph with topological ordering (`FeedEngine`, `FeedSource`), not the parallel reconciler described above. The `priority` field is being replaced by post-processing (see the ideas doc). This section describes the UI and enhancement architecture going forward.
+
+Feed items carry an optional `ui` field containing a json-render tree, and an optional `slots` field for LLM-fillable content.
+
+```typescript
+interface FeedItem<TType, TData> {
+  id: string
+  type: TType
+  timestamp: Date
+  data: TData
+  ui?: JsonRenderNode
+  slots?: Record<string, Slot>
+}
+
+interface Slot {
+  /** Tells the LLM what this slot wants — the source writes this */
+  description: string
+  /** LLM-filled text content, null until enhanced */
+  content: string | null
+}
+```
+
+### How it works
+
+The source produces the item with a UI tree and empty slots:
+
+```typescript
+// Weather source produces:
+{
+  id: "weather-current-123",
+  type: "weather-current",
+  data: { temperature: 18, condition: "cloudy" },
+  ui: {
+    component: "VStack",
+    children: [
+      { component: "WeatherHeader", props: { temp: 18, condition: "cloudy" } },
+      { component: "Slot", props: { name: "insight" } },
+      { component: "HourlyChart", props: { hours: [...] } },
+      { component: "Slot", props: { name: "cross-source" } },
+    ]
+  },
+  slots: {
+    "insight": {
+      description: "A short contextual insight about the current weather and how it affects the user's day",
+      content: null
+    },
+    "cross-source": {
+      description: "Connection between weather and the user's calendar events or plans",
+      content: null
+    }
+  }
+}
+```
+
+The LLM enhancement harness fills `content`:
+
+```typescript
+slots: {
+  "insight": {
+    description: "...",
+    content: "Rain after 3pm — grab a jacket before your walk"
+  },
+  "cross-source": {
+    description: "...",
+    content: "Should be dry by 7pm for your dinner at The Ivy"
+  }
+}
+```
+
+The client renders the `ui` tree. When it hits a `Slot` node, it looks up `slots[name].content`. If non-null, render the text. If null, render nothing.
+
+### Separation of concerns
+
+- **Sources** own the UI layout and declare what slots exist with descriptions.
+- **The LLM** fills slot content. It doesn't know about layout or positioning.
+- **The client** renders the UI tree and resolves slots to their content.
+
+Sources define the prompt for each slot via the `description` field. The harness doesn't need to know what slots any source type has — it reads them dynamically from the items.
+
+Each source defines its own slots. The harness handles them automatically — no central registry needed.
+
+## Enhancement Harness
+
+The LLM enhancement harness fills slots and produces synthetic feed items. It runs reactively — triggered by context changes, not by a timer.
+
+### Execution model
+
+```
+FeedEngine.refresh()
+  → sources produce items with ui + empty slots
+         ↓
+Fast path (rule-based post-processors, <10ms)
+  → group, dedup, affinity, time-adjust
+  → merge LAST cached slot fills + synthetic items
+  → return feed to UI immediately
+         ↓
+Background: has context changed since last LLM run?
+  (hash of: item IDs + data + slot descriptions + user memory)
+         ↓
+No  → done, cache is still valid
+Yes → run LLM harness async
+      → fill slots + generate synthetic items
+      → cache result
+      → push updated feed to UI via WebSocket
+```
+
+The user never waits for the LLM. They see the feed instantly with the previous enhancement applied. If the LLM produces new slot content or synthetic items, the feed updates in place.
+
+### LLM input
+
+The harness serializes items with their unfilled slots into a single prompt. Items without slots are excluded. The LLM sees everything at once and fills whatever slots are relevant.
+
+```typescript
+function buildHarnessInput(
+  items: FeedItem[],
+  context: AgentContext,
+): HarnessInput {
+  const itemsWithSlots = items
+    .filter(item => item.slots && Object.keys(item.slots).length > 0)
+    .map(item => ({
+      id: item.id,
+      type: item.type,
+      data: item.data,
+      slots: Object.fromEntries(
+        Object.entries(item.slots!).map(
+          ([name, slot]) => [name, slot.description]
+        )
+      ),
+    }))
+
+  return {
+    items: itemsWithSlots,
+    userMemory: context.preferences,
+    currentTime: new Date().toISOString(),
+  }
+}
+```
+
+The LLM sees:
+
+```json
+{
+  "items": [
+    {
+      "id": "weather-current-123",
+      "type": "weather-current",
+      "data": { "temperature": 18, "condition": "cloudy" },
+      "slots": {
+        "insight": "A short contextual insight about the current weather and how it affects the user's day",
+        "cross-source": "Connection between weather and the user's calendar events or plans"
+      }
+    },
+    {
+      "id": "calendar-event-456",
+      "type": "calendar-event",
+      "data": { "title": "Dinner at The Ivy", "startTime": "19:00", "location": "The Ivy, West St" },
+      "slots": {
+        "context": "Background on this event, attendees, or previous meetings with these people",
+        "logistics": "Travel time, parking, directions to the venue",
+        "weather": "Weather conditions relevant to this event's time and location"
+      }
+    }
+  ],
+  "userMemory": { "commute": "victoria-line", "preference.walking_distance": "1 mile" },
+  "currentTime": "2025-02-26T14:30:00Z"
+}
+```
+
+### LLM output
+
+A flat map of item ID → slot name → text content. Slots left null are unfilled.
+
+```json
+{
+  "slotFills": {
+    "weather-current-123": {
+      "insight": "Rain after 3pm — grab a jacket before your walk",
+      "cross-source": "Should be dry by 7pm for your dinner at The Ivy"
+    },
+    "calendar-event-456": {
+      "context": null,
+      "logistics": "20-minute walk from home — leave by 18:40",
+      "weather": "Rain clears by evening, you'll be fine"
+    }
+  },
+  "syntheticItems": [
+    {
+      "id": "briefing-morning",
+      "type": "briefing",
+      "data": {},
+      "ui": { "component": "Text", "props": { "text": "Light afternoon — just your dinner at 7. Rain clears by then." } }
+    }
+  ],
+  "suppress": [],
+  "rankingHints": {}
+}
+```
+
+### Enhancement manager
+
+One per user, living in the `FeedEngineManager` on the backend:
+
+```typescript
+class EnhancementManager {
+  private cache: EnhancementResult | null = null
+  private lastInputHash: string | null = null
+  private running = false
+
+  async enhance(
+    items: FeedItem[],
+    context: AgentContext,
+  ): Promise<EnhancementResult> {
+    const hash = computeHash(items, context)
+
+    if (hash === this.lastInputHash && this.cache) {
+      return this.cache
+    }
+
+    if (this.running) {
+      return this.cache ?? emptyResult()
+    }
+
+    this.running = true
+    this.runHarness(items, context)
+      .then(result => {
+        this.cache = result
+        this.lastInputHash = hash
+        this.notifySubscribers(result)
+      })
+      .finally(() => { this.running = false })
+
+    return this.cache ?? emptyResult()
+  }
+}
+
+interface EnhancementResult {
+  slotFills: Record<string, Record<string, string | null>>
+  syntheticItems: FeedItem[]
+  suppress: string[]
+  rankingHints: Record<string, number>
+}
+```
+
+### Merging
+
+After the harness runs, the engine merges slot fills into items:
+
+```typescript
+function mergeEnhancement(
+  items: FeedItem[],
+  result: EnhancementResult,
+): FeedItem[] {
+  return items.map(item => {
+    const fills = result.slotFills[item.id]
+    if (!fills || !item.slots) return item
+
+    const mergedSlots = { ...item.slots }
+    for (const [name, content] of Object.entries(fills)) {
+      if (name in mergedSlots && content !== null) {
+        mergedSlots[name] = { ...mergedSlots[name], content }
+      }
+    }
+
+    return { ...item, slots: mergedSlots }
+  })
+}
+```
+
+### Cost control
+
+- **Hash-based cache gate.** Most refreshes reuse the cached result.
+- **Debounce.** Rapid context changes (location updates) settle before triggering a run.
+- **Skip inactive users.** Don't run if the user hasn't opened the app in 2+ hours.
+- **Exclude slotless items.** Only items with slots are sent to the LLM.
+- **Text-only output.** Slots produce strings, not UI trees — fewer output tokens, less variance.
 
 ## Open Questions
 
-- Exact schema format for UI registry
-- How third parties authenticate/register their sources and UI schemas
+- How third parties authenticate/register their sources
+- Exact set of React Native components exposed in the json-render component map
+- Validation/sandboxing of third-party ui trees
+- How synthetic items define their UI (full json-render tree vs. registered component)
+- Should slots support rich content (json-render nodes) in the future, or stay text-only?
+- How to handle slot content that references other items (e.g., "your dinner at The Ivy" linking to the calendar card)

docs/feed-source-actions-spec.md

@@ -125,7 +125,7 @@ interface FeedSource<TItem extends FeedItem = FeedItem> {
 
 ### Changes to FeedItem
 
-One optional field added.
+Optional fields added for actions, server-driven UI, and LLM slots.
 
 ```typescript
 interface FeedItem<
@@ -140,6 +140,12 @@ interface FeedItem<
 
 	/** Actions the user can take on this item. */
 	actions?: readonly ItemAction[]
+
+	/** Server-driven UI tree rendered by json-render on the client. */
+	ui?: JsonRenderNode
+
+	/** Named slots for LLM-fillable content. See architecture-draft.md. */
+	slots?: Record<string, Slot>
 }
 ```
 
@@ -222,6 +228,25 @@ class SpotifySource implements FeedSource<SpotifyFeedItem> {
 					{ actionId: "skip-track" },
 					{ actionId: "like-track", params: { trackId: track.id } },
 				],
+				ui: {
+					type: "View",
+					className: "flex-row items-center p-3 gap-3 bg-white dark:bg-black rounded-xl",
+					children: [
+						{
+							type: "Image",
+							source: { uri: track.albumArt },
+							className: "w-12 h-12 rounded-lg",
+						},
+						{
+							type: "View",
+							className: "flex-1",
+							children: [
+								{ type: "Text", className: "font-semibold text-black dark:text-white", text: track.name },
+								{ type: "Text", className: "text-sm text-gray-500 dark:text-gray-400", text: track.artist },
+							],
+						},
+					],
+				},
 			},
 		]
 	}
@@ -236,6 +261,8 @@ class SpotifySource implements FeedSource<SpotifyFeedItem> {
 4. `FeedSource.listActions()` is a required method returning `Record<string, ActionDefinition>` (empty record if no actions)
 5. `FeedSource.executeAction()` is a required method (no-op for sources without actions)
 6. `FeedItem.actions` is an optional readonly array of `ItemAction`
+6b. `FeedItem.ui` is an optional json-render tree describing server-driven UI
+6c. `FeedItem.slots` is an optional record of named LLM-fillable slots
 7. `FeedEngine.executeAction()` routes to correct source, returns `ActionResult`
 8. `FeedEngine.listActions()` aggregates actions from all sources
 9. Existing tests pass unchanged (all changes are additive)

packages/aris-core/src/context-bridge.ts

@@ -1,8 +1,10 @@
-import type { Context } from "./context"
+import type { ContextEntry } from "./context"
 import type { ContextProvider } from "./context-provider"
 
+import { contextKey } from "./context"
+
 interface ContextUpdatable {
-	pushContextUpdate(update: Partial<Context>): void
+	pushContextUpdate(entries: readonly ContextEntry[]): void
 }
 
 export interface ProviderError {
@@ -54,7 +56,7 @@ export class ContextBridge {
 		this.providers.set(provider.key, provider as ContextProvider)
 
 		const cleanup = provider.onUpdate((value) => {
-			this.controller.pushContextUpdate({ [provider.key]: value })
+			this.controller.pushContextUpdate([[contextKey(provider.key), value]])
 		})
 		this.cleanups.push(cleanup)
 
@@ -67,7 +69,7 @@ export class ContextBridge {
 	 * Returns errors from providers that failed to fetch.
 	 */
 	async refresh(): Promise<RefreshResult> {
-		const updates: Partial<Context> = {}
+		const collected: ContextEntry[] = []
 		const errors: ProviderError[] = []
 
 		const entries = Array.from(this.providers.entries())
@@ -78,7 +80,7 @@ export class ContextBridge {
 		entries.forEach(([key], i) => {
 			const result = results[i]
 			if (result?.status === "fulfilled") {
-				updates[key] = result.value
+				collected.push([contextKey(key), result.value])
 			} else if (result?.status === "rejected") {
 				errors.push({
 					key,
@@ -87,7 +89,7 @@ export class ContextBridge {
 			}
 		})
 
-		this.controller.pushContextUpdate(updates)
+		this.controller.pushContextUpdate(collected)
 
 		return { errors }
 	}

packages/aris-core/src/context.test.ts

@@ -0,0 +1,184 @@
+import { describe, expect, test } from "bun:test"
+
+import type { ContextKey } from "./context"
+
+import { Context, contextKey } from "./context"
+
+interface Weather {
+	temperature: number
+}
+
+interface NextEvent {
+	title: string
+}
+
+const WeatherKey: ContextKey<Weather> = contextKey("aris.weather", "current")
+const NextEventKey: ContextKey<NextEvent> = contextKey("aris.google-calendar", "nextEvent")
+
+describe("Context", () => {
+	describe("get", () => {
+		test("returns undefined for missing key", () => {
+			const ctx = new Context()
+			expect(ctx.get(WeatherKey)).toBeUndefined()
+		})
+
+		test("returns value for exact key match", () => {
+			const ctx = new Context()
+			const weather: Weather = { temperature: 20 }
+			ctx.set([[WeatherKey, weather]])
+
+			expect(ctx.get(WeatherKey)).toEqual(weather)
+		})
+
+		test("distinguishes keys with different parts", () => {
+			const ctx = new Context()
+			ctx.set([
+				[WeatherKey, { temperature: 20 }],
+				[NextEventKey, { title: "Standup" }],
+			])
+
+			expect(ctx.get(WeatherKey)).toEqual({ temperature: 20 })
+			expect(ctx.get(NextEventKey)).toEqual({ title: "Standup" })
+		})
+
+		test("last write wins for same key", () => {
+			const ctx = new Context()
+			ctx.set([[WeatherKey, { temperature: 20 }]])
+			ctx.set([[WeatherKey, { temperature: 25 }]])
+
+			expect(ctx.get(WeatherKey)).toEqual({ temperature: 25 })
+		})
+	})
+
+	describe("find", () => {
+		test("returns empty array when no keys match", () => {
+			const ctx = new Context()
+			expect(ctx.find(WeatherKey)).toEqual([])
+		})
+
+		test("returns exact match as single result", () => {
+			const ctx = new Context()
+			ctx.set([[NextEventKey, { title: "Standup" }]])
+
+			const results = ctx.find(NextEventKey)
+			expect(results).toHaveLength(1)
+			expect(results[0]!.value).toEqual({ title: "Standup" })
+		})
+
+		test("prefix match returns multiple instances", () => {
+			const workKey = contextKey<NextEvent>("aris.google-calendar", "nextEvent", {
+				account: "work",
+			})
+			const personalKey = contextKey<NextEvent>("aris.google-calendar", "nextEvent", {
+				account: "personal",
+			})
+
+			const ctx = new Context()
+			ctx.set([
+				[workKey, { title: "Sprint Planning" }],
+				[personalKey, { title: "Dentist" }],
+			])
+
+			const prefix = contextKey<NextEvent>("aris.google-calendar", "nextEvent")
+			const results = ctx.find(prefix)
+
+			expect(results).toHaveLength(2)
+			const titles = results.map((r) => r.value.title).sort()
+			expect(titles).toEqual(["Dentist", "Sprint Planning"])
+		})
+
+		test("prefix match includes exact match and longer keys", () => {
+			const baseKey = contextKey<NextEvent>("aris.google-calendar", "nextEvent")
+			const instanceKey = contextKey<NextEvent>("aris.google-calendar", "nextEvent", {
+				account: "work",
+			})
+
+			const ctx = new Context()
+			ctx.set([
+				[baseKey, { title: "Base" }],
+				[instanceKey, { title: "Instance" }],
+			])
+
+			const results = ctx.find(baseKey)
+			expect(results).toHaveLength(2)
+		})
+
+		test("does not match keys that share a string prefix but differ at segment boundary", () => {
+			const keyA = contextKey<string>("aris.calendar", "next")
+			const keyB = contextKey<string>("aris.calendar", "nextEvent")
+
+			const ctx = new Context()
+			ctx.set([
+				[keyA, "a"],
+				[keyB, "b"],
+			])
+
+			const results = ctx.find(keyA)
+			expect(results).toHaveLength(1)
+			expect(results[0]!.value).toBe("a")
+		})
+
+		test("object key parts with different property order match", () => {
+			const key1 = contextKey<string>("source", "ctx", { b: 2, a: 1 })
+			const key2 = contextKey<string>("source", "ctx", { a: 1, b: 2 })
+
+			const ctx = new Context()
+			ctx.set([[key1, "value"]])
+
+			// Exact match via get should work regardless of property order
+			expect(ctx.get(key2)).toBe("value")
+
+			// find with the reordered key as prefix should also match
+			const prefix = contextKey<string>("source", "ctx")
+			const results = ctx.find(prefix)
+			expect(results).toHaveLength(1)
+		})
+
+		test("single-segment prefix matches all keys starting with that segment", () => {
+			const ctx = new Context()
+			ctx.set([
+				[contextKey("aris.weather", "current"), { temperature: 20 }],
+				[contextKey("aris.weather", "forecast"), { high: 25 }],
+				[contextKey("aris.calendar", "nextEvent"), { title: "Meeting" }],
+			])
+
+			const results = ctx.find(contextKey("aris.weather"))
+			expect(results).toHaveLength(2)
+		})
+
+		test("does not match shorter keys", () => {
+			const ctx = new Context()
+			ctx.set([[contextKey("aris.weather"), "short"]])
+
+			const results = ctx.find(contextKey("aris.weather", "current"))
+			expect(results).toHaveLength(0)
+		})
+
+		test("numeric key parts match correctly", () => {
+			const ctx = new Context()
+			ctx.set([
+				[contextKey("source", 1, "data"), "one"],
+				[contextKey("source", 2, "data"), "two"],
+			])
+
+			const results = ctx.find(contextKey("source", 1))
+			expect(results).toHaveLength(1)
+			expect(results[0]!.value).toBe("one")
+		})
+	})
+
+	describe("size", () => {
+		test("returns 0 for empty context", () => {
+			expect(new Context().size).toBe(0)
+		})
+
+		test("reflects number of entries", () => {
+			const ctx = new Context()
+			ctx.set([
+				[WeatherKey, { temperature: 20 }],
+				[NextEventKey, { title: "Standup" }],
+			])
+			expect(ctx.size).toBe(2)
+		})
+	})
+})

packages/aris-core/src/context.ts

@@ -1,46 +1,131 @@
 /**
- * Branded type for type-safe context keys.
+ * Tuple-keyed context system inspired by React Query's query keys.
  *
- * Each package defines its own keys with associated value types:
- * ```ts
- * const LocationKey: ContextKey<Location> = contextKey("location")
- * ```
+ * Context keys are arrays that form a hierarchy. Sources write to specific
+ * keys (e.g., ["aris.google-calendar", "nextEvent", { account: "work" }])
+ * and consumers can query by exact match or prefix match to get all values
+ * of a given type across source instances.
  */
-export type ContextKey<T> = string & { __contextValue?: T }
 
-/**
- * Creates a typed context key.
- *
- * @example
- * ```ts
- * interface Location { lat: number; lng: number; accuracy: number }
- * const LocationKey: ContextKey<Location> = contextKey("location")
- * ```
- */
-export function contextKey<T>(key: string): ContextKey<T> {
-	return key as ContextKey<T>
+// -- Key types --
+
+/** A single segment of a context key: string, number, or a record of primitives. */
+export type ContextKeyPart = string | number | Record<string, unknown>
+
+/** A context key is a readonly tuple of parts, branded with the value type. */
+export type ContextKey<T> = readonly ContextKeyPart[] & { __contextValue?: T }
+
+/** Creates a typed context key. */
+export function contextKey<T>(...parts: ContextKeyPart[]): ContextKey<T> {
+	return parts as ContextKey<T>
 }
 
-/**
- * Type-safe accessor for context values.
- *
- * @example
- * ```ts
- * const location = contextValue(context, LocationKey)
- * if (location) {
- *   console.log(location.lat, location.lng)
- * }
- * ```
- */
-export function contextValue<T>(context: Context, key: ContextKey<T>): T | undefined {
-	return context[key] as T | undefined
-}
+// -- Serialization --
 
 /**
- * Arbitrary key-value bag representing the current state.
- * Always includes `time`. Other keys are added by context providers.
+ * Deterministic serialization of a context key for use as a Map key.
+ * Object parts have their keys sorted for stable comparison.
  */
-export interface Context {
+export function serializeKey(key: readonly ContextKeyPart[]): string {
+	return JSON.stringify(key, (_key, value) => {
+		if (value !== null && typeof value === "object" && !Array.isArray(value)) {
+			const sorted: Record<string, unknown> = {}
+			for (const k of Object.keys(value).sort()) {
+				sorted[k] = value[k]
+			}
+			return sorted
+		}
+		return value
+	})
+}
+
+// -- Key matching --
+
+/** Returns true if `key` starts with all parts of `prefix`. */
+function keyStartsWith(key: readonly ContextKeyPart[], prefix: readonly ContextKeyPart[]): boolean {
+	if (key.length < prefix.length) return false
+
+	for (let i = 0; i < prefix.length; i++) {
+		if (!partsEqual(key[i]!, prefix[i]!)) return false
+	}
+
+	return true
+}
+
+/** Recursive structural equality, matching React Query's partialMatchKey approach. */
+function partsEqual(a: unknown, b: unknown): boolean {
+	if (a === b) return true
+	if (typeof a !== typeof b) return false
+	if (a && b && typeof a === "object" && typeof b === "object") {
+		const aKeys = Object.keys(a)
+		const bKeys = Object.keys(b)
+		if (aKeys.length !== bKeys.length) return false
+		return aKeys.every((key) =>
+			partsEqual(
+				(a as Record<string, unknown>)[key],
+				(b as Record<string, unknown>)[key],
+			),
+		)
+	}
+	return false
+}
+
+// -- Context store --
+
+/** A single context entry: a key-value pair. */
+export type ContextEntry<T = unknown> = readonly [ContextKey<T>, T]
+
+/**
+ * Mutable context store with tuple keys.
+ *
+ * Supports exact-match lookups and prefix-match queries.
+ * Sources write context in topological order during refresh.
+ */
+export class Context {
 	time: Date
-	[key: string]: unknown
+	private readonly store: Map<string, { key: readonly ContextKeyPart[]; value: unknown }>
+
+	constructor(time: Date = new Date()) {
+		this.time = time
+		this.store = new Map()
+	}
+
+	/** Merges entries into this context. */
+	set(entries: readonly ContextEntry[]): void {
+		for (const [key, value] of entries) {
+			this.store.set(serializeKey(key), { key, value })
+		}
+	}
+
+	/** Exact-match lookup. Returns the value for the given key, or undefined. */
+	get<T>(key: ContextKey<T>): T | undefined {
+		const entry = this.store.get(serializeKey(key))
+		return entry?.value as T | undefined
+	}
+
+	/**
+	 * Prefix-match query. Returns all entries whose key starts with the given prefix.
+	 *
+	 * @example
+	 * ```ts
+	 * // Get all "nextEvent" values across calendar source instances
+	 * const events = context.find(contextKey("nextEvent"))
+	 * ```
+	 */
+	find<T>(prefix: ContextKey<T>): Array<{ key: readonly ContextKeyPart[]; value: T }> {
+		const results: Array<{ key: readonly ContextKeyPart[]; value: T }> = []
+
+		for (const entry of this.store.values()) {
+			if (keyStartsWith(entry.key, prefix)) {
+				results.push({ key: entry.key, value: entry.value as T })
+			}
+		}
+
+		return results
+	}
+
+	/** Returns the number of entries (excluding time). */
+	get size(): number {
+		return this.store.size
+	}
 }

packages/aris-core/src/data-source.ts

@@ -12,15 +12,15 @@ import type { FeedItem } from "./feed"
  *   readonly type = "weather"
  *
  *   async query(context: Context): Promise<WeatherItem[]> {
- *     const location = contextValue(context, LocationKey)
+ *     const location = context.get(LocationKey)
  *     if (!location) return []
  *     const data = await fetchWeather(location)
  *     return [{
  *       id: `weather-${Date.now()}`,
  *       type: this.type,
- *       priority: 0.5,
  *       timestamp: context.time,
  *       data: { temp: data.temperature },
+ *       signals: { urgency: 0.5, timeRelevance: "ambient" },
  *     }]
  *   }
  * }

packages/aris-core/src/feed-controller.ts

@@ -1,8 +1,9 @@
-import type { Context } from "./context"
+import type { ContextEntry } from "./context"
 import type { DataSource } from "./data-source"
 import type { FeedItem } from "./feed"
 import type { ReconcileResult } from "./reconciler"
 
+import { Context } from "./context"
 import { Reconciler } from "./reconciler"
 
 export interface FeedControllerConfig {
@@ -40,7 +41,7 @@ const DEFAULT_DEBOUNCE_MS = 100
  * })
  *
  * // Context update triggers debounced reconcile
- * controller.pushContextUpdate({ [LocationKey]: location })
+ * controller.pushContextUpdate([[LocationKey, location]])
  *
  * // Direct reconcile (no debounce)
  * const result = await controller.reconcile()
@@ -59,7 +60,7 @@ export class FeedController<TItems extends FeedItem = never> {
 	private stopped = false
 
 	constructor(config?: FeedControllerConfig) {
-		this.context = config?.initialContext ?? { time: new Date() }
+		this.context = config?.initialContext ?? new Context()
 		this.debounceMs = config?.debounceMs ?? DEFAULT_DEBOUNCE_MS
 		this.timeout = config?.timeout
 	}
@@ -94,9 +95,10 @@ export class FeedController<TItems extends FeedItem = never> {
 		}
 	}
 
-	/** Merges update into context and schedules a debounced reconcile. */
-	pushContextUpdate(update: Partial<Context>): void {
-		this.context = { ...this.context, ...update, time: new Date() }
+	/** Merges entries into context and schedules a debounced reconcile. */
+	pushContextUpdate(entries: readonly ContextEntry[]): void {
+		this.context.time = new Date()
+		this.context.set(entries)
 		this.scheduleReconcile()
 	}