diff --git a/event_data_capture/src/event_data_capture/cli.py b/event_data_capture/src/event_data_capture/cli.py
new file mode 100644
index 0000000..e6f9745
--- /dev/null
+++ b/event_data_capture/src/event_data_capture/cli.py
@@ -0,0 +1,61 @@
+import argparse
+import json
+import os
+from pathlib import Path
+from typing import Any, List
+
+from event_data_capture.core import capture_event_data, EventData
+
+
+def _validate_file_path(path_str: str) -> Path:
+    path = Path(path_str)
+    if not path.exists() or not path.is_file():
+        raise FileNotFoundError(f"Eingabedatei nicht gefunden: {path_str}")
+    return path
+
+
+def _read_json_file(path: Path) -> Any:
+    with path.open('r', encoding='utf-8') as f:
+        return json.load(f)
+
+
+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, ensure_ascii=False)
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser(description="Erfasst und aggregiert Eventdaten für Run #6.")
+    parser.add_argument('--input', required=True, help='Pfad zur JSON-Datei mit Eventdaten.')
+    parser.add_argument('--output', required=True, help='Pfad zur Ausgabedatei für die Event-Zusammenfassung.')
+
+    args = parser.parse_args()
+
+    input_path = _validate_file_path(args.input)
+    output_path = Path(args.output)
+
+    input_data = _read_json_file(input_path)
+
+    if not isinstance(input_data, dict):
+        raise ValueError('Eingabedatei muss ein JSON-Objekt mit Strata enthalten.')
+
+    summary: dict[str, List[dict[str, float]]] = {}
+
+    for stratum_name, events in input_data.items():
+        if not isinstance(stratum_name, str):
+            continue
+        try:
+            event_list = capture_event_data(stratum_name)
+        except Exception as e:
+            raise RuntimeError(f"Fehler bei Verarbeitung von {stratum_name}: {e}") from e
+
+        summary[stratum_name] = [
+            {'warn_rate': e.warn_rate, 'unknown_rate': e.unknown_rate} for e in event_list
+        ]
+
+    _write_json_file(output_path, summary)
+
+
+if __name__ == '__main__':
+    main()