diff --git a/tools/maca_env_snapshot.py b/tools/maca_env_snapshot.py
new file mode 100644
index 0000000..65da2a9
--- /dev/null
+++ b/tools/maca_env_snapshot.py
@@ -0,0 +1,69 @@
+#!/usr/bin/env python3
+"""Collect a reproducible MACA validation environment snapshot."""
+
+from __future__ import annotations
+
+import argparse
+import json
+import os
+import platform
+import shutil
+import subprocess
+import sys
+from pathlib import Path
+
+
+def _command_version(command: str, args: list[str]) -> dict[str, object]:
+    path = shutil.which(command)
+    if not path:
+        return {"path": "", "available": False, "version": ""}
+    try:
+        completed = subprocess.run([path, *args], text=True, capture_output=True, timeout=5)
+        version = (completed.stdout or completed.stderr).strip().splitlines()[:5]
+        return {
+            "path": path,
+            "available": True,
+            "returncode": completed.returncode,
+            "version": version,
+        }
+    except (subprocess.SubprocessError, OSError) as exc:
+        return {
+            "path": path,
+            "available": True,
+            "returncode": -1,
+            "version": [f"Error: {exc}"],
+        }
+
+
+def snapshot() -> dict[str, object]:
+    return {
+        "python": sys.version.split()[0],
+        "platform": platform.platform(),
+        "environment": {
+            "MACA_PATH": os.environ.get("MACA_PATH", ""),
+            "LD_LIBRARY_PATH": os.environ.get("LD_LIBRARY_PATH", ""),
+            "PYTHONPATH": os.environ.get("PYTHONPATH", ""),
+        },
+        "tools": {
+            "mxcc": _command_version("mxcc", ["--version"]),
+            "cmake_maca": _command_version("cmake_maca", ["--version"]),
+        },
+    }
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument("--output", type=Path)
+    args = parser.parse_args()
+
+    text = json.dumps(snapshot(), indent=2, ensure_ascii=False)
+    if args.output:
+        args.output.parent.mkdir(parents=True, exist_ok=True)
+        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_maca_env_snapshot.py b/unit_test/test_maca_env_snapshot.py
new file mode 100644
index 0000000..d131997
--- /dev/null
+++ b/unit_test/test_maca_env_snapshot.py
@@ -0,0 +1,30 @@
+import subprocess
+from unittest.mock import patch
+import unittest
+
+from tools.maca_env_snapshot import _command_version, snapshot
+
+
+class MacaEnvSnapshotTest(unittest.TestCase):
+    def test_snapshot_has_expected_sections(self):
+        report = snapshot()
+
+        self.assertIn("python", report)
+        self.assertIn("environment", report)
+        self.assertIn("tools", report)
+
+    @patch("tools.maca_env_snapshot.shutil.which", return_value="/usr/bin/mxcc")
+    @patch(
+        "tools.maca_env_snapshot.subprocess.run",
+        side_effect=subprocess.TimeoutExpired(cmd=["mxcc", "--version"], timeout=5),
+    )
+    def test_command_version_handles_timeout(self, _run, _which):
+        report = _command_version("mxcc", ["--version"])
+
+        self.assertTrue(report["available"])
+        self.assertEqual(report["returncode"], -1)
+        self.assertIn("Error:", report["version"][0])
+
+
+if __name__ == "__main__":
+    unittest.main()