diff --git a/models/models.go b/models/models.go
index 18a2a08..cef8242 100644
--- a/models/models.go
+++ b/models/models.go
@@ -11,6 +11,12 @@ type Answer struct {
 	Answer string `json:"answer"`
 	Model  string `json:"model"`
 	// resp time?
+	ToolCall ToolCall `json:"tool_call"`
+}
+
+type ToolCall struct {
+	Name string                  `json:"name"`
+	Args map[string]ToolArgProps `json:"args"`
 }
 
 // type OpenRouterResp struct {
diff --git a/tools.go b/tools.go
index fa2dbc7..df48a44 100644
--- a/tools.go
+++ b/tools.go
@@ -7,7 +7,7 @@ import (
 
 func sendEmail(args map[string]string) []byte {
 	logger.Info("send-email is used", "args", args)
-	return nil
+	return []byte("email was sent")
 }
 
 func getCurrentTimestamp(args map[string]string) []byte {