diff --git a/.gitignore b/.gitignore
index df11f9a..4edfb0a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -167,7 +167,7 @@ test-out-2/mic.wav
 test-out-2/recording.wav
 test-out-2/system.wav
 build_assets/native-capture-helper
-build_assets/ClosedRoomNativeCapture.app/Contents/MacOS/ClosedRoomNativeCapture
+build_assets/ClosedRoomNativeCapture.app/
 update-uv-dependences-llm-local-server
 docs/assets/Screenshot 2026-06-26 alle 16.23.57.heic
 docs/assets/Screenshot 2026-06-26 alle 16.24.33.heic
diff --git a/build_assets/ClosedRoomNativeCapture.app/Contents/Info.plist b/build_assets/ClosedRoomNativeCapture.app/Contents/Info.plist
deleted file mode 100644
index 1b34b21..0000000
--- a/build_assets/ClosedRoomNativeCapture.app/Contents/Info.plist
+++ /dev/null
@@ -1,29 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN"
-  "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
-<plist version="1.0">
-<dict>
-    <key>CFBundleIdentifier</key>
-    <string>com.closedroom.nativecapture</string>
-    <key>CFBundleName</key>
-    <string>ClosedRoom Native Capture</string>
-    <key>CFBundleDisplayName</key>
-    <string>ClosedRoom Native Capture</string>
-    <key>CFBundleExecutable</key>
-    <string>ClosedRoomNativeCapture</string>
-    <key>CFBundlePackageType</key>
-    <string>APPL</string>
-    <key>CFBundleVersion</key>
-    <string>1.0.0</string>
-    <key>CFBundleShortVersionString</key>
-    <string>1.0.0</string>
-    <key>LSUIElement</key>
-    <true/>
-    <key>NSMicrophoneUsageDescription</key>
-    <string>ClosedRoom uses the microphone to record your voice for local transcription.</string>
-    <key>NSScreenCaptureUsageDescription</key>
-    <string>ClosedRoom records screen and system audio to capture computer audio.</string>
-    <key>NSAudioCaptureUsageDescription</key>
-    <string>ClosedRoom records computer audio to transcribe meetings and local audio sources.</string>
-</dict>
-</plist>
diff --git a/test/test_build_generated_assets_contract.py b/test/test_build_generated_assets_contract.py
new file mode 100644
index 0000000..6ce1fc9
--- /dev/null
+++ b/test/test_build_generated_assets_contract.py
@@ -0,0 +1,57 @@
+from __future__ import annotations
+
+import subprocess
+from pathlib import Path
+import unittest
+
+
+ROOT = Path(__file__).parents[1]
+HELPER_APP = "build_assets/ClosedRoomNativeCapture.app"
+
+
+class GeneratedBuildAssetsContractTests(unittest.TestCase):
+    def test_native_helper_app_is_generated_and_ignored(self) -> None:
+        tracked = subprocess.run(
+            ["git", "ls-files", "--error-unmatch", f"{HELPER_APP}/Contents/Info.plist"],
+            cwd=ROOT,
+            capture_output=True,
+            text=True,
+            check=False,
+        )
+        ignored = subprocess.run(
+            ["git", "check-ignore", "-q", f"{HELPER_APP}/Contents/Info.plist"],
+            cwd=ROOT,
+            check=False,
+        )
+
+        self.assertNotEqual(
+            tracked.returncode,
+            0,
+            "generated native helper Info.plist must not be tracked",
+        )
+        self.assertEqual(
+            ignored.returncode,
+            0,
+            "generated native helper app must remain ignored",
+        )
+
+    def test_build_regenerates_and_embeds_native_helper_app(self) -> None:
+        build_script = (ROOT / "build.sh").read_text(encoding="utf-8")
+
+        self.assertIn(
+            'NATIVE_HELPER_APP="$BUILD_ASSETS/ClosedRoomNativeCapture.app"',
+            build_script,
+        )
+        self.assertIn('rm -rf "$NATIVE_HELPER_APP"', build_script)
+        self.assertIn(
+            'cat > "$NATIVE_HELPER_APP/Contents/Info.plist" <<PLIST',
+            build_script,
+        )
+        self.assertIn(
+            'ditto "$NATIVE_HELPER_APP" "$NATIVE_HELPER_APP_IN_APP"',
+            build_script,
+        )
+
+
+if __name__ == "__main__":
+    unittest.main()