diff --git a/examples/experimental/llm_agent/llm_agent.toml b/examples/experimental/llm_agent/llm_agent.toml
index 68f9ff92..8972b7d5 100644
--- a/examples/experimental/llm_agent/llm_agent.toml
+++ b/examples/experimental/llm_agent/llm_agent.toml
@@ -45,4 +45,4 @@ node_class = "chat_print"
 "Agent:Runtime" = "agent_action"
 
 [nodes.node_args]
-env_agents = ["Jack", "Jane"]
\ No newline at end of file
+env_agents = ["Jack", "Jane"]
diff --git a/sotopia/experimental/nodes/chat_print_node.py b/sotopia/experimental/nodes/chat_print_node.py
index efe4bcaa..a19c887e 100644
--- a/sotopia/experimental/nodes/chat_print_node.py
+++ b/sotopia/experimental/nodes/chat_print_node.py
@@ -11,7 +11,7 @@
 from rich.logging import RichHandler
 
 from aact import NodeFactory
-from aact.nodes import PrintNode 
+from aact.nodes import PrintNode
 
 console = Console()
 
@@ -72,7 +72,11 @@ def convert_to_sentence(self, data: Dict[str, Any], agent_name: str) -> None:
                 except Exception as e:
                     console.print(
                         Panel(
-                            RichText(f"Error processing write action: {e}", style="bold red", justify="center"),
+                            RichText(
+                                f"Error processing write action: {e}",
+                                style="bold red",
+                                justify="center",
+                            ),
                             title="Error",
                             expand=False,
                             border_style="red",
@@ -240,4 +244,4 @@ async def write_to_screen(self) -> None:
             else:
                 print("Invalid data structure:", data)
 
-            await self.output.flush()
\ No newline at end of file
+            await self.output.flush()