diff --git a/mcp-servers/llm-gateway/failover.py b/mcp-servers/llm-gateway/failover.py
index 45df882..8516be7 100644
--- a/mcp-servers/llm-gateway/failover.py
+++ b/mcp-servers/llm-gateway/failover.py
@@ -111,7 +111,10 @@ class CircuitBreaker:
         if self._state == CircuitState.OPEN:
             time_in_open = time.time() - self._stats.state_changed_at
             # Double-check state after time calculation (for thread safety)
-            if time_in_open >= self.recovery_timeout and self._state == CircuitState.OPEN:
+            if (
+                time_in_open >= self.recovery_timeout
+                and self._state == CircuitState.OPEN
+            ):
                 self._transition_to(CircuitState.HALF_OPEN)
                 logger.info(
                     f"Circuit {self.name} transitioned to HALF_OPEN "