diff --git a/tools/op_complexity_report.py b/tools/op_complexity_report.py
new file mode 100644
index 0000000..e3196c6
--- /dev/null
+++ b/tools/op_complexity_report.py
@@ -0,0 +1,57 @@
+#!/usr/bin/env python3
+"""Summarize CUDA/MACA operator source complexity for validation planning."""
+
+from __future__ import annotations
+
+import argparse
+import json
+from pathlib import Path
+
+
+SOURCE_SUFFIXES = {".cu", ".cuh", ".cpp", ".h"}
+
+
+def analyze_file(path: Path, root: Path) -> dict[str, object]:
+    text = path.read_text(encoding="utf-8", errors="replace")
+    return {
+        "path": path.relative_to(root).as_posix(),
+        "lines": len(text.splitlines()),
+        "kernel_launches": text.count("<<<"),
+        "templates": text.count("template"),
+        "torch_bindings": text.count("PYBIND11_MODULE"),
+    }
+
+
+def build_report(root: Path) -> dict[str, object]:
+    op_dir = root / "op"
+    if not op_dir.is_dir():
+        return {"file_count": 0, "total_lines": 0, "top_by_lines": []}
+
+    files = [
+        analyze_file(path, root)
+        for path in sorted(op_dir.rglob("*"))
+        if path.is_file() and path.suffix in SOURCE_SUFFIXES
+    ]
+    return {
+        "file_count": len(files),
+        "total_lines": sum(item["lines"] for item in files),
+        "top_by_lines": sorted(files, key=lambda item: item["lines"], reverse=True)[:20],
+    }
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument("--root", type=Path, default=Path.cwd(), help="repository root")
+    parser.add_argument("--output", type=Path, help="write JSON report to this path")
+    args = parser.parse_args()
+
+    text = json.dumps(build_report(args.root), indent=2, ensure_ascii=False)
+    if args.output:
+        args.output.write_text(text + "\n", encoding="utf-8")
+    else:
+        print(text)
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
diff --git a/unit_test/test_op_complexity_report.py b/unit_test/test_op_complexity_report.py
new file mode 100644
index 0000000..a66fffb
--- /dev/null
+++ b/unit_test/test_op_complexity_report.py
@@ -0,0 +1,29 @@
+import tempfile
+import unittest
+from pathlib import Path
+
+from tools.op_complexity_report import build_report
+
+
+class OpComplexityReportTest(unittest.TestCase):
+    def test_counts_operator_sources(self):
+        with tempfile.TemporaryDirectory() as tmpdir:
+            root = Path(tmpdir)
+            op = root / "op"
+            op.mkdir()
+            (op / "kernel.cu").write_text("template <typename T>\nvoid f(){ k<<<1,1>>>(); }\n", encoding="utf-8")
+
+            report = build_report(root)
+
+        self.assertEqual(report["file_count"], 1)
+        self.assertEqual(report["top_by_lines"][0]["kernel_launches"], 1)
+
+    def test_returns_empty_report_when_op_directory_is_missing(self):
+        with tempfile.TemporaryDirectory() as tmpdir:
+            report = build_report(Path(tmpdir))
+
+        self.assertEqual(report, {"file_count": 0, "total_lines": 0, "top_by_lines": []})
+
+
+if __name__ == "__main__":
+    unittest.main()