diff --git a/.gemini/GEMINI.md b/.gemini/GEMINI.md
index 30a11ed6b..934ed99e7 100644
--- a/.gemini/GEMINI.md
+++ b/.gemini/GEMINI.md
@@ -40,3 +40,10 @@ When the CatalogItem API changes, it is necessary to update all the existing cat
 ## How to update every CatalogItem
 
 1. Find all CatalogItem implementations which will be at `examples/travel_app/lib/src/catalog/*`, `pkgs/flutter_genui/lib/src/catalog/*` etc. Update each of them.
+
+## Folder `spikes`
+
+The folder `spikes` contains experiments and proof of concepts,
+that does not have to be of good quality.
+
+Skip this folder when reviewing code.
diff --git a/pkgs/flutter_genui/lib/flutter_genui.dart b/pkgs/flutter_genui/lib/flutter_genui.dart
index 8a7127dd0..7b360a730 100644
--- a/pkgs/flutter_genui/lib/flutter_genui.dart
+++ b/pkgs/flutter_genui/lib/flutter_genui.dart
@@ -14,7 +14,3 @@ export 'src/model/catalog.dart';
 export 'src/model/catalog_item.dart';
 export 'src/model/dynamic_ui.dart';
 export 'src/model/ui_models.dart';
-export 'src/to_merge/agent/agent.dart';
-export 'src/to_merge/model/controller.dart';
-export 'src/to_merge/model/image_catalog.dart';
-export 'src/to_merge/model/input.dart';
diff --git a/pkgs/spikes/travel_app_hardcoded/lib/app.dart b/pkgs/spikes/travel_app_hardcoded/lib/app.dart
index a76923118..1759abdf8 100644
--- a/pkgs/spikes/travel_app_hardcoded/lib/app.dart
+++ b/pkgs/spikes/travel_app_hardcoded/lib/app.dart
@@ -1,5 +1,9 @@
 import 'package:flutter/material.dart';
-import 'package:flutter_genui/flutter_genui.dart';
+
+import 'sdk_stubs/agent/agent.dart';
+import 'sdk_stubs/model/controller.dart';
+import 'sdk_stubs/model/image_catalog.dart';
+import 'sdk_stubs/model/input.dart';
 
 class MyApp extends StatelessWidget {
   const MyApp({super.key});
diff --git a/pkgs/flutter_genui/lib/src/to_merge/README.md b/pkgs/spikes/travel_app_hardcoded/lib/sdk_stubs/README.md
similarity index 100%
rename from pkgs/flutter_genui/lib/src/to_merge/README.md
rename to pkgs/spikes/travel_app_hardcoded/lib/sdk_stubs/README.md
diff --git a/pkgs/flutter_genui/lib/src/to_merge/agent/agent.dart b/pkgs/spikes/travel_app_hardcoded/lib/sdk_stubs/agent/agent.dart
similarity index 100%
rename from pkgs/flutter_genui/lib/src/to_merge/agent/agent.dart
rename to pkgs/spikes/travel_app_hardcoded/lib/sdk_stubs/agent/agent.dart
diff --git a/pkgs/flutter_genui/lib/src/to_merge/agent/fake_output.dart b/pkgs/spikes/travel_app_hardcoded/lib/sdk_stubs/agent/fake_output.dart
similarity index 100%
rename from pkgs/flutter_genui/lib/src/to_merge/agent/fake_output.dart
rename to pkgs/spikes/travel_app_hardcoded/lib/sdk_stubs/agent/fake_output.dart
diff --git a/pkgs/flutter_genui/lib/src/to_merge/catalog/elements/carousel.dart b/pkgs/spikes/travel_app_hardcoded/lib/sdk_stubs/catalog/elements/carousel.dart
similarity index 100%
rename from pkgs/flutter_genui/lib/src/to_merge/catalog/elements/carousel.dart
rename to pkgs/spikes/travel_app_hardcoded/lib/sdk_stubs/catalog/elements/carousel.dart
diff --git a/pkgs/flutter_genui/lib/src/to_merge/catalog/elements/filter.dart b/pkgs/spikes/travel_app_hardcoded/lib/sdk_stubs/catalog/elements/filter.dart
similarity index 100%
rename from pkgs/flutter_genui/lib/src/to_merge/catalog/elements/filter.dart
rename to pkgs/spikes/travel_app_hardcoded/lib/sdk_stubs/catalog/elements/filter.dart
diff --git a/pkgs/flutter_genui/lib/src/to_merge/catalog/elements/text_intro.dart b/pkgs/spikes/travel_app_hardcoded/lib/sdk_stubs/catalog/elements/text_intro.dart
similarity index 100%
rename from pkgs/flutter_genui/lib/src/to_merge/catalog/elements/text_intro.dart
rename to pkgs/spikes/travel_app_hardcoded/lib/sdk_stubs/catalog/elements/text_intro.dart
diff --git a/pkgs/flutter_genui/lib/src/to_merge/catalog/messages/elicitation.dart b/pkgs/spikes/travel_app_hardcoded/lib/sdk_stubs/catalog/messages/elicitation.dart
similarity index 100%
rename from pkgs/flutter_genui/lib/src/to_merge/catalog/messages/elicitation.dart
rename to pkgs/spikes/travel_app_hardcoded/lib/sdk_stubs/catalog/messages/elicitation.dart
diff --git a/pkgs/flutter_genui/lib/src/to_merge/catalog/messages/invitation.dart b/pkgs/spikes/travel_app_hardcoded/lib/sdk_stubs/catalog/messages/invitation.dart
similarity index 100%
rename from pkgs/flutter_genui/lib/src/to_merge/catalog/messages/invitation.dart
rename to pkgs/spikes/travel_app_hardcoded/lib/sdk_stubs/catalog/messages/invitation.dart
diff --git a/pkgs/flutter_genui/lib/src/to_merge/catalog/messages/result.dart b/pkgs/spikes/travel_app_hardcoded/lib/sdk_stubs/catalog/messages/result.dart
similarity index 100%
rename from pkgs/flutter_genui/lib/src/to_merge/catalog/messages/result.dart
rename to pkgs/spikes/travel_app_hardcoded/lib/sdk_stubs/catalog/messages/result.dart
diff --git a/pkgs/flutter_genui/lib/src/to_merge/catalog/shared/chat_box.dart b/pkgs/spikes/travel_app_hardcoded/lib/sdk_stubs/catalog/shared/chat_box.dart
similarity index 100%
rename from pkgs/flutter_genui/lib/src/to_merge/catalog/shared/chat_box.dart
rename to pkgs/spikes/travel_app_hardcoded/lib/sdk_stubs/catalog/shared/chat_box.dart
diff --git a/pkgs/flutter_genui/lib/src/to_merge/catalog/shared/genui_widget.dart b/pkgs/spikes/travel_app_hardcoded/lib/sdk_stubs/catalog/shared/genui_widget.dart
similarity index 100%
rename from pkgs/flutter_genui/lib/src/to_merge/catalog/shared/genui_widget.dart
rename to pkgs/spikes/travel_app_hardcoded/lib/sdk_stubs/catalog/shared/genui_widget.dart
diff --git a/pkgs/flutter_genui/lib/src/to_merge/catalog/shared/text_styles.dart b/pkgs/spikes/travel_app_hardcoded/lib/sdk_stubs/catalog/shared/text_styles.dart
similarity index 100%
rename from pkgs/flutter_genui/lib/src/to_merge/catalog/shared/text_styles.dart
rename to pkgs/spikes/travel_app_hardcoded/lib/sdk_stubs/catalog/shared/text_styles.dart
diff --git a/pkgs/flutter_genui/lib/src/to_merge/model/controller.dart b/pkgs/spikes/travel_app_hardcoded/lib/sdk_stubs/model/controller.dart
similarity index 100%
rename from pkgs/flutter_genui/lib/src/to_merge/model/controller.dart
rename to pkgs/spikes/travel_app_hardcoded/lib/sdk_stubs/model/controller.dart
diff --git a/pkgs/flutter_genui/lib/src/to_merge/model/image_catalog.dart b/pkgs/spikes/travel_app_hardcoded/lib/sdk_stubs/model/image_catalog.dart
similarity index 100%
rename from pkgs/flutter_genui/lib/src/to_merge/model/image_catalog.dart
rename to pkgs/spikes/travel_app_hardcoded/lib/sdk_stubs/model/image_catalog.dart
diff --git a/pkgs/flutter_genui/lib/src/to_merge/model/input.dart b/pkgs/spikes/travel_app_hardcoded/lib/sdk_stubs/model/input.dart
similarity index 100%
rename from pkgs/flutter_genui/lib/src/to_merge/model/input.dart
rename to pkgs/spikes/travel_app_hardcoded/lib/sdk_stubs/model/input.dart
diff --git a/pkgs/flutter_genui/lib/src/to_merge/model/simple_items.dart b/pkgs/spikes/travel_app_hardcoded/lib/sdk_stubs/model/simple_items.dart
similarity index 100%
rename from pkgs/flutter_genui/lib/src/to_merge/model/simple_items.dart
rename to pkgs/spikes/travel_app_hardcoded/lib/sdk_stubs/model/simple_items.dart
diff --git a/pkgs/flutter_genui/lib/src/to_merge/primitives/utils.dart b/pkgs/spikes/travel_app_hardcoded/lib/sdk_stubs/primitives/utils.dart
similarity index 100%
rename from pkgs/flutter_genui/lib/src/to_merge/primitives/utils.dart
rename to pkgs/spikes/travel_app_hardcoded/lib/sdk_stubs/primitives/utils.dart
diff --git a/pkgs/spikes/travel_app_hardcoded/pubspec.yaml b/pkgs/spikes/travel_app_hardcoded/pubspec.yaml
index 7115dde7e..dfc63eca4 100644
--- a/pkgs/spikes/travel_app_hardcoded/pubspec.yaml
+++ b/pkgs/spikes/travel_app_hardcoded/pubspec.yaml
@@ -11,6 +11,7 @@ dependencies:
     sdk: flutter
   flutter_genui:
     path: ../../flutter_genui
+  url_launcher: ^6.2.6
 
 dev_dependencies:
   dart_flutter_team_lints: ^3.5.2