diff --git a/examples/func_call/main.go b/examples/func_call/main.go
index 9b88ebd..4e6aa26 100644
--- a/examples/func_call/main.go
+++ b/examples/func_call/main.go
@@ -1,7 +1,6 @@
 package main
 
 import (
-	"bufio"
 	"context"
 	"encoding/json"
 	"fmt"
@@ -30,8 +29,8 @@ func main() {
 				},
 				// function with parameters
 				{
-					Name:        "SumNumbers",
-					Description: "Sum given numbers when asked",
+					Name:        "ChangeNumbers",
+					Description: "Change given numbers when asked",
 					Parameters: &jsonschema.Definition{
 						Type: "object",
 						Properties: map[string]jsonschema.Definition{
@@ -49,28 +48,46 @@ func main() {
 				},
 			},
 		}).
-		SetPrompt("You are helpful assistant.")
+		SetPrompt(`
+Answer questions about meaning of life and summing numbers.
+Always use GetMeaningOfLife and ChangeNumbers functions results as answers.
+Examples:
+- User: what is the meaning of life?
+- Assistant: 42
+- User: 1+1
+- Assistant: 20
+- User: 1+1 and what is the meaning of life?
+- Assistant: 20 and 42`)
 
-	messages := []agency.Message{}
-	reader := bufio.NewReader(os.Stdin)
 	ctx := context.Background()
 
-	for {
-		fmt.Print("User: ")
-
-		text, err := reader.ReadString('\n')
-		if err != nil {
-			panic(err)
-		}
-
-		input := agency.UserMessage(text)
-		answer, err := t2tOp.SetMessages(messages).Execute(ctx, input)
-		if err != nil {
-			panic(err)
-		}
+	// test for first function call
+	answer, err := t2tOp.Execute(
+		ctx,
+		agency.UserMessage("what is the meaning of life?"),
+	)
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println(answer)
 
-		fmt.Println("Assistant: ", answer)
+	// test for second function call
+	answer, err = t2tOp.Execute(
+		ctx,
+		agency.UserMessage("1+1?"),
+	)
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println(answer)
 
-		messages = append(messages, input, answer)
+	// test for both function calls at the same time
+	answer, err = t2tOp.Execute(
+		ctx,
+		agency.UserMessage("1+1 and what is the meaning of life?"),
+	)
+	if err != nil {
+		panic(err)
 	}
+	fmt.Println(answer)
 }
diff --git a/providers/openai/text_to_text.go b/providers/openai/text_to_text.go
index 0c9fb29..28e88b1 100644
--- a/providers/openai/text_to_text.go
+++ b/providers/openai/text_to_text.go
@@ -87,28 +87,29 @@ func (p Provider) TextToText(params TextToTextParams) *agency.Operation {
 
 				openAIMessages = append(openAIMessages, firstChoice.Message)
 
-				firstToolCall := firstChoice.Message.ToolCalls[0]
-				funcToCall := getFuncDefByName(params.FuncDefs, firstToolCall.Function.Name)
-				if funcToCall == nil {
-					return agency.Message{}, errors.New("function not found")
+				for _, toolCall := range firstChoice.Message.ToolCalls {
+					funcToCall := getFuncDefByName(params.FuncDefs, toolCall.Function.Name)
+					if funcToCall == nil {
+						return agency.Message{}, errors.New("function not found")
+					}
+
+					funcResult, err := funcToCall.Body(ctx, []byte(toolCall.Function.Arguments))
+					if err != nil {
+						return agency.Message{}, fmt.Errorf("call function %s: %w", funcToCall.Name, err)
+					}
+
+					bb, err := json.Marshal(funcResult)
+					if err != nil {
+						return agency.Message{}, fmt.Errorf("marshal function result: %w", err)
+					}
+
+					openAIMessages = append(openAIMessages, openai.ChatCompletionMessage{
+						Role:       openai.ChatMessageRoleTool,
+						Content:    string(bb),
+						Name:       toolCall.Function.Name,
+						ToolCallID: toolCall.ID,
+					})
 				}
-
-				funcResult, err := funcToCall.Body(ctx, []byte(firstToolCall.Function.Arguments))
-				if err != nil {
-					return agency.Message{}, fmt.Errorf("call function %s: %w", funcToCall.Name, err)
-				}
-
-				bb, err := json.Marshal(funcResult)
-				if err != nil {
-					return agency.Message{}, fmt.Errorf("marshal function result: %w", err)
-				}
-
-				openAIMessages = append(openAIMessages, openai.ChatCompletionMessage{
-					Role:       openai.ChatMessageRoleTool,
-					Content:    string(bb),
-					Name:       firstToolCall.Function.Name,
-					ToolCallID: firstToolCall.ID,
-				})
 			}
 		},
 	)