feat(agent): add app-specific hints registry

server/src/agent/hints.ts

@@ -0,0 +1,70 @@
+/**
+ * App-specific hints for the DroidClaw UI agent.
+ *
+ * Injected into the agent prompt ONLY when the foreground app matches.
+ * Keeps the prompt lean — no hints for apps that aren't on screen.
+ */
+
+const APP_HINTS: Record<string, string[]> = {
+  "com.google.android.youtube": [
+    "Mini-player at bottom expands with SWIPE UP from its coordinates, not tap (tap = play/pause).",
+    "Search: tap magnifying glass icon at top, type query, tap search result.",
+    "Fullscreen: the video player area. Tap once to show controls, double-tap sides to skip.",
+  ],
+  "com.whatsapp": [
+    "To send a message, tap the green arrow/send button — do NOT use 'enter' key.",
+    "New chat: tap the green floating button (bottom-right), then search for contact.",
+    "Media: tap the + or paperclip icon to attach files/images.",
+  ],
+  "com.instagram.android": [
+    "Search: tap magnifying glass in bottom nav bar.",
+    "DMs: tap messenger icon (top-right on home screen).",
+    "New post: tap + icon in bottom nav.",
+  ],
+  "com.google.android.gm": [
+    "Compose: tap the floating pencil/write button (bottom-right).",
+    "ALWAYS use compose_email action for filling email fields — never type into fields manually.",
+  ],
+  "com.android.chrome": [
+    "Address bar is at the top — tap it to type a URL or search query.",
+    "Tabs: tap the number icon (top-right) to switch tabs.",
+  ],
+  "com.google.android.apps.maps": [
+    "Search: tap the search bar at top of screen.",
+    "Directions: tap 'Directions' button after selecting a place.",
+    "Prefer using intent with google.navigation URI for turn-by-turn navigation.",
+  ],
+  "com.spotify.music": [
+    "Search: tap 'Search' in bottom nav.",
+    "Mini-player at bottom expands with SWIPE UP, not tap.",
+    "Prefer using intent with spotify: URI to play specific tracks/playlists.",
+  ],
+  "com.google.android.apps.messaging": [
+    "New message: tap the floating button with + or pencil icon.",
+    "To field: type the contact name or number, then select from suggestions.",
+    "Send: tap the arrow/send icon, not Enter.",
+  ],
+  "com.google.android.dialer": [
+    "Dial pad: tap the floating phone icon if dial pad isn't visible.",
+    "Prefer using intent with tel: URI to call a number directly.",
+  ],
+};
+
+/**
+ * Get hints for a foreground app. Returns empty array if no hints registered.
+ */
+export function getAppHints(packageName: string): string[] {
+  return APP_HINTS[packageName] ?? [];
+}
+
+/**
+ * Format hints into a prompt section. Returns empty string if no hints.
+ */
+export function formatAppHints(packageName: string): string {
+  const hints = getAppHints(packageName);
+  if (hints.length === 0) return "";
+  return (
+    "\n\nAPP_HINTS (tips specific to this app):\n" +
+    hints.map((h) => `- ${h}`).join("\n")
+  );
+}