diff --git a/pkg/lmcli/provider/anthropic/anthropic.go b/pkg/lmcli/provider/anthropic/anthropic.go
index 8a410de..3908258 100644
--- a/pkg/lmcli/provider/anthropic/anthropic.go
+++ b/pkg/lmcli/provider/anthropic/anthropic.go
@@ -94,7 +94,11 @@ func buildRequest(params model.RequestParameters, messages []model.Message) Requ
 			if err != nil {
 				panic("Could not serialize []ToolCall to XMLFunctionCall")
 			}
-			message.Content += xmlString
+			if len(message.Content) > 0 {
+				message.Content += fmt.Sprintf("\n\n%s", xmlString)
+			} else {
+				message.Content = xmlString
+			}
 		case model.MessageRoleToolResult:
 			xmlFuncResults := convertToolResultsToXMLFunctionResult(msg.ToolResults)
 			xmlString, err := xmlFuncResults.XMLString()