diff --git a/bandwidth_analysis/src/bandwidth_analysis/cli.py b/bandwidth_analysis/src/bandwidth_analysis/cli.py
new file mode 100644
index 0000000..3d90c08
--- /dev/null
+++ b/bandwidth_analysis/src/bandwidth_analysis/cli.py
@@ -0,0 +1,59 @@
+import argparse
+import json
+from pathlib import Path
+from pandas import DataFrame
+from typing import Any
+
+from bandwidth_analysis import core
+
+
+def _load_json_file(path: Path) -> dict[str, Any]:
+    if not path.exists() or not path.is_file():
+        raise FileNotFoundError(f"Input file not found: {path}")
+    with path.open("r", encoding="utf-8") as f:
+        data = json.load(f)
+    if not isinstance(data, dict):
+        raise ValueError(f"Invalid JSON structure in {path}, expected object.")
+    return data
+
+
+def _write_json_file(path: Path, data: Any) -> None:
+    path.parent.mkdir(parents=True, exist_ok=True)
+    with path.open("w", encoding="utf-8") as f:
+        json.dump(data, f, indent=2)
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser(description="Analyse der Bandbreitenveränderung zwischen Baseline und Test.")
+    parser.add_argument("--baseline", required=True, help="Pfad zur JSON-Baseline-Datei.")
+    parser.add_argument("--test", required=True, help="Pfad zur JSON-Testdatei.")
+    parser.add_argument("--out", required=False, help="Optionaler Pfad für die Ausgabe der Analyse.")
+
+    args = parser.parse_args()
+
+    baseline_path = Path(args.baseline)
+    test_path = Path(args.test)
+    out_path = Path(args.out) if args.out else Path("output/analysis_result.json")
+
+    baseline_data = _load_json_file(baseline_path)
+    test_data = _load_json_file(test_path)
+
+    # Falls DataFrame-Input nötig wird, kann Konvertierung erfolgen:
+    baseline_df = DataFrame(baseline_data)
+    test_df = DataFrame(test_data)
+
+    result = core.analyze_bandwidth(baseline_df, test_df)
+
+    # Erwartet, dass result in ein JSON-serialisierbares dict konvertiert werden kann
+    if isinstance(result, dict):
+        serializable_result = result
+    elif hasattr(result, "__dict__"):
+        serializable_result = result.__dict__
+    else:
+        raise TypeError("analysis_result is not JSON serializable")
+
+    _write_json_file(out_path, serializable_result)
+
+
+if __name__ == "__main__":
+    main()