diff --git a/.github/copilot-tasks.md b/.github/copilot-tasks.md
index 40f5652..b44be84 100644
--- a/.github/copilot-tasks.md
+++ b/.github/copilot-tasks.md
@@ -77,10 +77,10 @@ Projekt vollstaendig umsetzen: aus PS_PW.xlsx und Stellenbeschreibungen.xlsx mon
 	- [x] Bei mehreren Zuordnungen: mehrere Sheets in derselben Datei
 
 ## Phase 7 - CLI und Benutzerfluss
-- [ ] T13: CLI in `generate.py` implementieren
-	- [ ] Parameter `--month` und `--year`
-	- [ ] Pipeline orchestrieren: parse -> match -> validate -> preview -> write
-	- [ ] Kontrollierter Exit-Code bei Fehlern
+- [x] T13: CLI in `generate.py` implementieren
+	- [x] Parameter `--month` und `--year`
+	- [x] Pipeline orchestrieren: parse -> match -> validate -> preview -> write
+	- [x] Kontrollierter Exit-Code bei Fehlern
 - [ ] T14: Vorschau + Bestaetigung vor Schreiben
 	- [ ] Uebersicht zu Berichtsmonat, aktiven Faellen, Fehlern
 	- [ ] Liste der geplanten Ausgabedateien
@@ -111,4 +111,4 @@ Projekt vollstaendig umsetzen: aus PS_PW.xlsx und Stellenbeschreibungen.xlsx mon
 8. T15 -> T16 -> T17
 
 ## Aktueller Startpunkt
-- [ ] Naechste aktive Aufgabe: T13 (CLI in generate.py implementieren)
+- [ ] Naechste aktive Aufgabe: T14 (Vorschau + Bestaetigung vor Schreiben)
diff --git a/generate.py b/generate.py
new file mode 100644
index 0000000..0405bc4
--- /dev/null
+++ b/generate.py
@@ -0,0 +1,122 @@
+from __future__ import annotations
+
+import json
+from pathlib import Path
+
+import click
+
+from src.taetigkeitsnachweis.errors import TaetigkeitsnachweisError
+from src.taetigkeitsnachweis.logging_utils import configure_logging
+from src.taetigkeitsnachweis.matcher import match_assignments
+from src.taetigkeitsnachweis.parser import parse_allocation_records, parse_masterdata_records
+from src.taetigkeitsnachweis.validator import validate_business_rules, validate_sources
+from src.taetigkeitsnachweis.writer import build_employee_workbooks, save_employee_workbooks
+
+
+def _load_config(project_root: Path) -> dict:
+    config_path = project_root / "config.json"
+    with config_path.open("r", encoding="utf-8") as config_file:
+        return json.load(config_file)
+
+
+def _print_issues(issues: list, title: str) -> None:
+    if not issues:
+        return
+    click.echo(title)
+    for issue in issues:
+        click.echo(f"- [{issue.severity}] {issue.code}: {issue.message}")
+
+
+def _print_preview(month: int, year: int, matched_assignments: list) -> None:
+    click.echo("=== Vorschau der ermittelten Werte ===")
+    click.echo(f"Berichtsmonat : {month:02d}/{year}")
+    click.echo(f"Aktive Faelle : {len(matched_assignments)}")
+    click.echo("--- Zu erzeugende Taetigkeitsnachweise ---")
+    for item in matched_assignments:
+        click.echo(
+            "- "
+            f"{item.allocation.employee_name} | "
+            f"{item.masterdata.funktion} | "
+            f"{item.foerderquote_percent:.2f}%"
+        )
+
+
+@click.command()
+@click.option("--month", type=click.IntRange(1, 12), required=True)
+@click.option("--year", type=click.IntRange(2000, 2100), required=True)
+def main(month: int, year: int) -> None:
+    configure_logging()
+    project_root = Path(__file__).resolve().parent
+
+    try:
+        config = _load_config(project_root)
+
+        source_issues = validate_sources(
+            config=config,
+            report_month=month,
+            report_year=year,
+            project_root=project_root,
+        )
+        _print_issues(source_issues, "=== Source validation ===")
+        if any(issue.severity == "error" for issue in source_issues):
+            raise click.ClickException("Source validation failed.")
+
+        allocation_records = parse_allocation_records(
+            config=config,
+            report_month=month,
+            report_year=year,
+            project_root=project_root,
+        )
+        masterdata_records = parse_masterdata_records(
+            config=config,
+            project_root=project_root,
+        )
+
+        matched_assignments, match_issues = match_assignments(
+            allocation_records=allocation_records,
+            masterdata_records=masterdata_records,
+            config=config,
+        )
+        _print_issues(match_issues, "=== Matching issues ===")
+
+        business_issues = validate_business_rules(
+            config=config,
+            report_month=month,
+            report_year=year,
+            allocation_records=allocation_records,
+            matched_assignments=matched_assignments,
+            project_root=project_root,
+        )
+        _print_issues(business_issues, "=== Business validation ===")
+
+        all_issues = [*match_issues, *business_issues]
+        if any(issue.severity == "error" for issue in all_issues):
+            raise click.ClickException("Validation failed after matching.")
+
+        _print_preview(month=month, year=year, matched_assignments=matched_assignments)
+
+        employee_workbooks = build_employee_workbooks(
+            config=config,
+            matched_assignments=matched_assignments,
+            report_month=month,
+            report_year=year,
+            project_root=project_root,
+        )
+        output_paths = save_employee_workbooks(
+            config=config,
+            employee_workbooks=employee_workbooks,
+            report_month=month,
+            report_year=year,
+            project_root=project_root,
+        )
+
+        click.echo("=== Generated files ===")
+        for output_path in output_paths:
+            click.echo(f"- {output_path}")
+
+    except TaetigkeitsnachweisError as exc:
+        raise click.ClickException(str(exc)) from exc
+
+
+if __name__ == "__main__":
+    main()
diff --git a/src/taetigkeitsnachweis/validator.py b/src/taetigkeitsnachweis/validator.py
index 8918c91..396ef4c 100644
--- a/src/taetigkeitsnachweis/validator.py
+++ b/src/taetigkeitsnachweis/validator.py
@@ -266,6 +266,7 @@ def validate_business_rules(
     report_year: int,
     allocation_records: list[AllocationRecord],
     matched_assignments: list[MatchedAssignment],
+    project_root: Path,
 ) -> list[ValidationIssue]:
     issues: list[ValidationIssue] = []
 
@@ -301,7 +302,6 @@ def validate_business_rules(
 
     paths_cfg = config["paths"]
     files_cfg = config["files"]
-    project_root = Path.cwd()
     template_path = (
         project_root
         / paths_cfg["template_dir"]