diff --git a/tests/integration/test_parser_batch_pack.py b/tests/integration/test_parser_batch_pack.py
new file mode 100644
index 00000000..840e363a
--- /dev/null
+++ b/tests/integration/test_parser_batch_pack.py
@@ -0,0 +1,20 @@
+from __future__ import annotations
+
+from openamp_foundry.cli.main import build_parser
+
+
+def test_batch_pack_parser_defaults_are_stable():
+    parser = build_parser()
+    args = parser.parse_args([
+        "batch-pack",
+        "--ranked",
+        "ranked.jsonl",
+        "--out-json",
+        "batch.json",
+    ])
+
+    assert args.command == "batch-pack"
+    assert args.ranked == "ranked.jsonl"
+    assert args.out_json == "batch.json"
+    assert args.out_md is None
+    assert args.diversity_threshold == 0.80