diff --git a/audit_analysis/src/audit_analysis/cli.py b/audit_analysis/src/audit_analysis/cli.py
new file mode 100644
index 0000000..c8909ee
--- /dev/null
+++ b/audit_analysis/src/audit_analysis/cli.py
@@ -0,0 +1,64 @@
+import argparse
+import json
+import logging
+from pathlib import Path
+from typing import Any
+
+import pandas as pd  # type: ignore
+
+from audit_analysis import core
+
+
+logging.basicConfig(
+    level=logging.INFO,
+    format='[%(asctime)s] %(levelname)s in %(module)s: %(message)s'
+)
+
+
+def _validate_input_file(file_path: Path) -> None:
+    if not file_path.exists() or not file_path.is_file():
+        raise FileNotFoundError(f'Eingabedatei nicht gefunden: {file_path}')
+    if not file_path.suffix.lower() == '.csv':
+        raise ValueError(f'Ungültiges Dateiformat: {file_path.suffix}, erwartet .csv')
+
+
+def main() -> None:
+    """CLI-Entrypoint für die Audit-Analyse."""
+    parser = argparse.ArgumentParser(
+        description='Analyse von CI-Auditdaten zur Klassifizierung von Unknowns.'
+    )
+    parser.add_argument(
+        '--input',
+        required=True,
+        help='Pfad zur Input-Audit-Datei (CSV)'
+    )
+    parser.add_argument(
+        '--output',
+        required=False,
+        help='Pfad zur Ausgabe-Datei (JSON)'
+    )
+
+    args = parser.parse_args()
+    input_path = Path(args.input)
+    output_path = Path(args.output) if args.output else Path('output/classification_report.json')
+
+    logging.info('Starte Analyse der Audit-Datei: %s', input_path)
+    try:
+        _validate_input_file(input_path)
+    except (FileNotFoundError, ValueError) as e:
+        logging.error('Validierung fehlgeschlagen: %s', e)
+        raise SystemExit(1) from e
+
+    try:
+        result: dict[str, Any] = core.analyze_audit(str(input_path))
+        output_path.parent.mkdir(parents=True, exist_ok=True)
+        with output_path.open('w', encoding='utf-8') as f:
+            json.dump(result, f, indent=2, ensure_ascii=False)
+        logging.info('Bericht gespeichert unter: %s', output_path)
+    except Exception as exc:
+        logging.exception('Fehler während der Analyse: %s', exc)
+        raise SystemExit(1) from exc
+
+
+if __name__ == '__main__':
+    main()