diff --git a/markitdown_mcp/server.py b/markitdown_mcp/server.py
index a60aa03..2ad576a 100644
--- a/markitdown_mcp/server.py
+++ b/markitdown_mcp/server.py
@@ -1050,7 +1050,10 @@ async def convert_file_tool(self, request_id: str, arguments: dict[str, Any]) ->
             ):
                 safe_message = "Invalid file path"
             elif "missingdependencyexception" in error_str or "dependency" in error_str:
-                safe_message = "Missing dependency - install markitdown with appropriate extras (e.g., markitdown[pdf])"
+                safe_message = (
+                    "Missing dependency - install markitdown with appropriate "
+                    "extras (e.g., markitdown[pdf])"
+                )
             else:
                 safe_message = "Conversion failed"