diff --git a/tests/test_download_api.py b/tests/test_download_api.py
new file mode 100644
index 0000000..03e1dec
--- /dev/null
+++ b/tests/test_download_api.py
@@ -0,0 +1,17 @@
+import importlib
+
+
+def test_downloader_facade_exports_only_supported_operations():
+    facade = importlib.import_module("core.downloader")
+
+    assert set(facade.__all__) == {
+        "cancel_download",
+        "clear_completed_downloads",
+        "download_file",
+        "download_model",
+        "get_all_progress",
+        "get_progress",
+        "start_background_download",
+    }
+    assert not hasattr(facade, "_aria2_rpc")
+    assert not hasattr(facade, "write_model_resolver_metadata")