diff --git a/scripts/get_pr_status.py b/scripts/get_pr_status.py
index 5c131d7..444ab3c 100644
--- a/scripts/get_pr_status.py
+++ b/scripts/get_pr_status.py
@@ -16,7 +16,12 @@ def get_pr_status(pr_id: str = "") -> None:
     """Fetches and prints the status of a PR using gh CLI."""
     cmd = ["gh", "pr", "view"]
     if pr_id:
-        cmd.append(pr_id)
+        pr_str = str(pr_id).strip()
+        if pr_str:
+            if not pr_str.isdigit():
+                print("Error: Invalid PR ID format. Must be numeric.", file=sys.stderr)
+                sys.exit(1)
+            cmd.append(pr_str)
     cmd.extend(["--json", "state,reviewDecision,statusCheckRollup"])
 
     try:
diff --git a/tests/test_get_pr_status.py b/tests/test_get_pr_status.py
index f5fcbf5..2ceb087 100644
--- a/tests/test_get_pr_status.py
+++ b/tests/test_get_pr_status.py
@@ -99,3 +99,25 @@ def test_get_pr_status_null_checks(mock_run_cmd, capsys):
     assert "PR Status: OPEN" in captured.out
     assert "Review Decision: REVIEW_REQUIRED" in captured.out
     assert "Checks: 0/0 passed" in captured.out
+
+def test_get_pr_status_invalid_pr_id(capsys):
+    with pytest.raises(SystemExit) as e:
+        get_pr_status("invalid_id")
+    assert e.value.code == 1
+    captured = capsys.readouterr()
+    assert "Error: Invalid PR ID format. Must be numeric." in captured.err
+
+@patch("scripts.get_pr_status.run_cmd")
+def test_get_pr_status_numeric_int_and_padded_string(mock_run_cmd, capsys):
+    mock_data = {
+        "state": "OPEN",
+        "reviewDecision": "APPROVED",
+        "statusCheckRollup": []
+    }
+    mock_run_cmd.return_value = json.dumps(mock_data)
+
+    get_pr_status(123)
+    mock_run_cmd.assert_called_with(["gh", "pr", "view", "123", "--json", "state,reviewDecision,statusCheckRollup"])
+
+    get_pr_status("  456  ")
+    mock_run_cmd.assert_called_with(["gh", "pr", "view", "456", "--json", "state,reviewDecision,statusCheckRollup"])