diff --git a/tools/lint_benchmark_configs.py b/tools/lint_benchmark_configs.py
new file mode 100644
index 0000000..4cf89c5
--- /dev/null
+++ b/tools/lint_benchmark_configs.py
@@ -0,0 +1,64 @@
+#!/usr/bin/env python3
+"""Validate mcoplib mxbenchmark config/runner pairs."""
+
+from __future__ import annotations
+
+import argparse
+import json
+import sys
+from pathlib import Path
+
+RUNNER_PREFIX = "mcoplib_mxbenchmark_"
+RUNNER_SUFFIX = "_runners.py"
+
+
+def collect_errors(root: Path) -> list[str]:
+    benchmark_dir = root / "benchmark"
+    config_dir = benchmark_dir / "config"
+    runners_dir = benchmark_dir / "runners"
+    errors: list[str] = []
+
+    if not config_dir.is_dir():
+        return [f"missing config directory: {config_dir}"]
+    if not runners_dir.is_dir():
+        return [f"missing runners directory: {runners_dir}"]
+
+    configs = {path.stem: path for path in config_dir.glob("*.json")}
+    runners = {
+        path.name[len(RUNNER_PREFIX) : -len(RUNNER_SUFFIX)]: path
+        for path in runners_dir.glob(f"{RUNNER_PREFIX}*{RUNNER_SUFFIX}")
+    }
+
+    for name in sorted(set(configs) - set(runners)):
+        errors.append(f"missing runner for config {configs[name].relative_to(root).as_posix()}")
+    for name in sorted(set(runners) - set(configs)):
+        errors.append(f"missing config for runner {runners[name].relative_to(root).as_posix()}")
+
+    for name, path in sorted(configs.items()):
+        try:
+            json.loads(path.read_text(encoding="utf-8"))
+        except (OSError, ValueError) as exc:
+            errors.append(f"invalid JSON or unreadable file in {path.relative_to(root).as_posix()}: {exc}")
+
+    return errors
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser(description="Lint mxbenchmark config and runner pairs.")
+    parser.add_argument("--root", type=Path, default=Path(__file__).resolve().parents[1])
+    args = parser.parse_args()
+
+    root = args.root.resolve()
+    errors = collect_errors(root)
+    if errors:
+        print("mxbenchmark config lint failed:", file=sys.stderr)
+        for error in errors:
+            print(f"  {error}", file=sys.stderr)
+        return 1
+
+    print("mxbenchmark config lint passed.")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
diff --git a/unit_test/test_lint_benchmark_configs.py b/unit_test/test_lint_benchmark_configs.py
new file mode 100644
index 0000000..c96f083
--- /dev/null
+++ b/unit_test/test_lint_benchmark_configs.py
@@ -0,0 +1,58 @@
+import json
+import tempfile
+import unittest
+from pathlib import Path
+
+import sys
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
+
+from tools.lint_benchmark_configs import collect_errors
+
+
+class LintBenchmarkConfigsTest(unittest.TestCase):
+    def test_detects_missing_runner(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            root = Path(tmp)
+            (root / "benchmark" / "config").mkdir(parents=True)
+            (root / "benchmark" / "runners").mkdir(parents=True)
+            (root / "benchmark" / "config" / "foo.json").write_text("{}", encoding="utf-8")
+
+            errors = collect_errors(root)
+
+        self.assertEqual(errors, ["missing runner for config benchmark/config/foo.json"])
+
+    def test_valid_pair_passes(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            root = Path(tmp)
+            (root / "benchmark" / "config").mkdir(parents=True)
+            (root / "benchmark" / "runners").mkdir(parents=True)
+            (root / "benchmark" / "config" / "foo.json").write_text(
+                json.dumps({"samples": 1}), encoding="utf-8"
+            )
+            (root / "benchmark" / "runners" / "mcoplib_mxbenchmark_foo_runners.py").write_text(
+                "", encoding="utf-8"
+            )
+
+            errors = collect_errors(root)
+
+        self.assertEqual(errors, [])
+
+    def test_reports_unreadable_config_file(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            root = Path(tmp)
+            (root / "benchmark" / "config").mkdir(parents=True)
+            (root / "benchmark" / "runners").mkdir(parents=True)
+            (root / "benchmark" / "config" / "foo.json").write_bytes(b"\xff\xfe")
+            (root / "benchmark" / "runners" / "mcoplib_mxbenchmark_foo_runners.py").write_text(
+                "", encoding="utf-8"
+            )
+
+            errors = collect_errors(root)
+
+        self.assertEqual(len(errors), 1)
+        self.assertIn("invalid JSON or unreadable file", errors[0])
+
+
+if __name__ == "__main__":
+    unittest.main()