diff --git a/tests/test_dashboard_inventory.py b/tests/test_dashboard_inventory.py
new file mode 100644
index 0000000..ab3346c
--- /dev/null
+++ b/tests/test_dashboard_inventory.py
@@ -0,0 +1,24 @@
+import tempfile
+import unittest
+from pathlib import Path
+
+from tools.dashboard_inventory import inventory
+
+
+class DashboardInventoryTest(unittest.TestCase):
+    def test_reports_invalid_json_with_path(self):
+        with tempfile.TemporaryDirectory() as tmpdir:
+            root = Path(tmpdir)
+            dashboard_dir = root / "deployment" / "grafana-dashboard"
+            dashboard_dir.mkdir(parents=True)
+            bad_path = dashboard_dir / "broken.json"
+            bad_path.write_text("{not-json", encoding="utf-8")
+
+            with self.assertRaises(RuntimeError) as ctx:
+                inventory(root)
+
+        self.assertIn(str(bad_path), str(ctx.exception))
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/tools/dashboard_inventory.py b/tools/dashboard_inventory.py
new file mode 100644
index 0000000..eec712f
--- /dev/null
+++ b/tools/dashboard_inventory.py
@@ -0,0 +1,45 @@
+#!/usr/bin/env python3
+"""Inventory Grafana dashboards shipped with mx-exporter."""
+
+from __future__ import annotations
+
+import argparse
+import json
+from pathlib import Path
+
+
+def inventory(root: Path) -> dict[str, object]:
+    dashboards = []
+    for path in sorted((root / "deployment" / "grafana-dashboard").glob("*.json")):
+        try:
+            data = json.loads(path.read_text(encoding="utf-8-sig"))
+        except json.JSONDecodeError as exc:
+            raise RuntimeError(f"Failed to parse JSON file {path}: {exc}") from exc
+        panels = data.get("panels", [])
+        dashboards.append(
+            {
+                "path": path.relative_to(root).as_posix(),
+                "title": data.get("title", ""),
+                "uid": data.get("uid", ""),
+                "panel_count": len(panels),
+            }
+        )
+    return {"dashboard_count": len(dashboards), "dashboards": dashboards}
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument("--root", type=Path, default=Path.cwd())
+    parser.add_argument("--output", type=Path)
+    args = parser.parse_args()
+
+    text = json.dumps(inventory(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())