diff --git a/scanslicer/entry.py b/scanslicer/entry.py
index dbea520..8fc4ad8 100644
--- a/scanslicer/entry.py
+++ b/scanslicer/entry.py
@@ -4,3 +4,20 @@ import sys
 
 
 # parse_args: function definition for ScanSlicer behavior.
+def parse_args(argv=None):
+    parser = argparse.ArgumentParser(
+        prog="scanslicer",
+        description="ScanSlicer Qt UI (Wayland/X11)",
+    )
+    parser.add_argument(
+        "path",
+        nargs="?",
+        help="Optional input directory containing images",
+    )
+    parser.add_argument(
+        "--backend",
+        choices=("auto", "wayland", "x11"),
+        default="auto",
+        help="Display backend selection (default: auto)",
+    )
+    return parser.parse_args(argv)