diff --git a/serato_doctor/cli.py b/serato_doctor/cli.py
index e69de29..cd48348 100644
--- a/serato_doctor/cli.py
+++ b/serato_doctor/cli.py
@@ -0,0 +1,49 @@
+from pathlib import Path
+import argparse
+
+from serato_doctor.crate_parser import parse_crates
+from serato_doctor.scanner import scan_audio
+from serato_doctor.report import write_csv, write_missing_report
+
+
+def main():
+    parser = argparse.ArgumentParser(prog="serato-doctor")
+    parser.add_argument("--serato", default=str(Path.home() / "Music/_Serato_"))
+    parser.add_argument("--music", default=str(Path.home() / "Library/CloudStorage/OneDrive-Personal/Jukebox"))
+    parser.add_argument("--out", default=str(Path.home() / "Desktop/serato_doctor_scan.csv"))
+    parser.add_argument("--report", default=str(Path.home() / "Desktop/serato_doctor_missing_report.txt"))
+    args = parser.parse_args()
+
+    serato = Path(args.serato)
+    music = Path(args.music)
+    out = Path(args.out)
+    report = Path(args.report)
+
+    refs = parse_crates(serato / "Subcrates")
+    disk = scan_audio(music)
+
+    disk_names = {t.filename for t in disk}
+
+    rows = []
+    for ref in refs:
+        rows.append({
+            "crate": str(ref.source),
+            "serato_path": str(ref.path),
+            "filename": ref.filename,
+            "exists_by_filename": ref.filename in disk_names,
+        })
+
+    missing_count = sum(1 for r in rows if not r["exists_by_filename"])
+
+    write_csv(rows, out)
+    write_missing_report(rows, report)
+
+    print(f"Crate references: {len(refs)}")
+    print(f"Disk tracks: {len(disk)}")
+    print(f"Missing by filename: {missing_count}")
+    print(f"CSV: {out}")
+    print(f"Report: {report}")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/serato_doctor/report.py b/serato_doctor/report.py
index e69de29..171a2f1 100644
--- a/serato_doctor/report.py
+++ b/serato_doctor/report.py
@@ -0,0 +1,42 @@
+from collections import Counter, defaultdict
+from pathlib import Path
+import csv
+
+
+def write_missing_report(rows: list[dict], out: Path) -> None:
+    missing = [r for r in rows if not r["exists_by_filename"]]
+
+    crate_counts = Counter(r["crate"] for r in missing)
+    filename_counts = Counter(r["filename"] for r in missing)
+
+    with out.open("w", encoding="utf-8") as f:
+        f.write("# Serato Doctor Missing Report\n\n")
+        f.write(f"Total missing references: {len(missing)}\n\n")
+
+        f.write("## Missing by crate\n\n")
+        for crate, count in crate_counts.most_common():
+            f.write(f"{count:5}  {crate}\n")
+
+        f.write("\n## Most common missing filenames\n\n")
+        for filename, count in filename_counts.most_common(100):
+            f.write(f"{count:5}  {filename}\n")
+
+        f.write("\n## Detail\n\n")
+        by_crate = defaultdict(list)
+        for r in missing:
+            by_crate[r["crate"]].append(r["filename"])
+
+        for crate, names in sorted(by_crate.items()):
+            f.write(f"\n### {crate}\n")
+            for name in sorted(set(names)):
+                f.write(f"- {name}\n")
+
+
+def write_csv(rows: list[dict], out: Path) -> None:
+    with out.open("w", newline="", encoding="utf-8") as f:
+        writer = csv.DictWriter(
+            f,
+            fieldnames=["crate", "serato_path", "filename", "exists_by_filename"],
+        )
+        writer.writeheader()
+        writer.writerows(rows)