fix: support raw JSON response tool arguments

service/openaicompat/responses_to_chat.go

@@ -60,7 +60,7 @@ func ResponsesResponseToChatCompletionsResponse(resp *dto.OpenAIResponsesRespons
 				Type: "function",
 				Function: dto.FunctionResponse{
 					Name:      name,
-					Arguments: out.Arguments,
+					Arguments: out.ArgumentsString(),
 				},
 			})
 		}