diff --git a/investing_algorithm_framework/cli/mcp_server.py b/investing_algorithm_framework/cli/mcp_server.py
index fc269520..513c5a75 100644
--- a/investing_algorithm_framework/cli/mcp_server.py
+++ b/investing_algorithm_framework/cli/mcp_server.py
@@ -1907,7 +1907,8 @@ def _get_tools(self):
                                         "description": (
                                             "Metric name, e.g. sharpe_ratio, "
                                             "cagr, max_drawdown, win_rate, "
-                                            "consistency_score, stability_score"
+                                            "consistency_score, "  # noqa
+                                            "stability_score"
                                         ),
                                     },
                                     "operator": {
diff --git a/investing_algorithm_framework/infrastructure/services/backtesting/vector_backtest_service.py b/investing_algorithm_framework/infrastructure/services/backtesting/vector_backtest_service.py
index 43b14f93..0c16f0af 100644
--- a/investing_algorithm_framework/infrastructure/services/backtesting/vector_backtest_service.py
+++ b/investing_algorithm_framework/infrastructure/services/backtesting/vector_backtest_service.py
@@ -332,8 +332,10 @@ def _close_trade(sym, sym_data, price, date):
             sym_data['entry_count'] = 0
             sym_data['scale_out_count'] = 0
 
-        def _open_trade(sym, sym_data, price, date, capital,
-                       order_reason="buy_signal"):
+        def _open_trade(
+            sym, sym_data, price, date, capital,
+            order_reason="buy_signal"
+        ):
             """Helper to open a new trade for a symbol."""
             nonlocal current_unallocated, total_allocated