diff --git a/agent/assistant/agent.go b/agent/assistant/agent.go
index 85417c31..b5f9383d 100644
--- a/agent/assistant/agent.go
+++ b/agent/assistant/agent.go
@@ -23,7 +23,7 @@ func (ast *Assistant) Stream(ctx *context.Context, inputMessages []context.Messa
 	}
 
 	// Request Create hook ( Optional )
-	var createResponse *context.ResponseHookCreate
+	var createResponse *context.HookCreateResponse
 	if ast.Script != nil {
 		var err error
 		createResponse, err = ast.Script.Create(ctx, fullMessages)
@@ -90,7 +90,7 @@ func (ast *Assistant) GetConnector(ctx *context.Context) string {
 }
 
 // BuildLLMRequest build the LLM request
-func (ast *Assistant) BuildLLMRequest(ctx *context.Context, messages []context.Message, createResponse *context.ResponseHookCreate) ([]context.Message, *llm.CompletionOptions, error) {
+func (ast *Assistant) BuildLLMRequest(ctx *context.Context, messages []context.Message, createResponse *context.HookCreateResponse) ([]context.Message, *llm.CompletionOptions, error) {
 	return messages, nil, nil
 }
 
diff --git a/agent/assistant/hook/create.go b/agent/assistant/hook/create.go
index aba8ebcd..770ed8bb 100644
--- a/agent/assistant/hook/create.go
+++ b/agent/assistant/hook/create.go
@@ -1,14 +1,44 @@
 package hook
 
-import "github.com/yaoapp/yao/agent/context"
+import (
+	"encoding/json"
+	"fmt"
+
+	"github.com/yaoapp/gou/runtime/v8/bridge"
+	"github.com/yaoapp/yao/agent/context"
+)
 
 // Create create a new assistant
-func (s *Script) Create(ctx *context.Context, messages []context.Message) (*context.ResponseHookCreate, error) {
+func (s *Script) Create(ctx *context.Context, messages []context.Message) (*context.HookCreateResponse, error) {
 	res, err := s.Execute(ctx, "Create", messages)
 	if err != nil {
 		return nil, err
 	}
-
-	_ = res
-	return &context.ResponseHookCreate{}, nil
+	return s.getHookCreateResponse(res)
+}
+
+// getHookCreateResponse convert the result to a HookCreateResponse
+func (s *Script) getHookCreateResponse(res interface{}) (*context.HookCreateResponse, error) {
+	// Handle nil result
+	if res == nil {
+		return nil, nil
+	}
+
+	// Handle undefined result (treat as nil)
+	if _, ok := res.(bridge.UndefinedT); ok {
+		return nil, nil
+	}
+
+	// Marshal to JSON and unmarshal to HookCreateResponse
+	raw, err := json.Marshal(res)
+	if err != nil {
+		return nil, fmt.Errorf("failed to marshal result: %w", err)
+	}
+
+	var response context.HookCreateResponse
+	if err := json.Unmarshal(raw, &response); err != nil {
+		return nil, fmt.Errorf("failed to unmarshal to HookCreateResponse: %w", err)
+	}
+
+	return &response, nil
 }
diff --git a/agent/assistant/hook/create_test.go b/agent/assistant/hook/create_test.go
index 3a11fcfd..be4c681e 100644
--- a/agent/assistant/hook/create_test.go
+++ b/agent/assistant/hook/create_test.go
@@ -1,11 +1,11 @@
 package hook_test
 
 import (
-	"context"
+	defaultContext "context"
 	"testing"
 
 	"github.com/yaoapp/yao/agent/assistant"
-	agentContext "github.com/yaoapp/yao/agent/context"
+	"github.com/yaoapp/yao/agent/context"
 	"github.com/yaoapp/yao/agent/testutils"
 )
 
@@ -23,12 +23,213 @@ func TestCreate(t *testing.T) {
 		t.Fatalf("The tests.create assistant has no script")
 	}
 
-	ctx := &agentContext.Context{
-		Context:     context.Background(),
+	ctx := &context.Context{
+		Context:     defaultContext.Background(),
 		ChatID:      "chat-test-create-hook",
 		AssistantID: "tests.create",
 		Sid:         "test-session-create-hook",
 	}
 
-	agent.Script.Create(ctx, []agentContext.Message{{Role: "user", Content: "Hello, how are you?"}})
+	// Test scenario 1: Return null (should get nil response)
+	t.Run("ReturnNull", func(t *testing.T) {
+		res, err := agent.Script.Create(ctx, []context.Message{{Role: "user", Content: "return_null"}})
+		if err != nil {
+			t.Fatalf("Failed to create with null return: %s", err.Error())
+		}
+		if res != nil {
+			t.Errorf("Expected nil response for null return, got: %v", res)
+		}
+	})
+
+	// Test scenario 2: Return undefined (should get nil response)
+	t.Run("ReturnUndefined", func(t *testing.T) {
+		res, err := agent.Script.Create(ctx, []context.Message{{Role: "user", Content: "return_undefined"}})
+		if err != nil {
+			t.Fatalf("Failed to create with undefined return: %s", err.Error())
+		}
+		if res != nil {
+			t.Errorf("Expected nil response for undefined return, got: %v", res)
+		}
+	})
+
+	// Test scenario 3: Return empty object (should get empty HookCreateResponse)
+	t.Run("ReturnEmpty", func(t *testing.T) {
+		res, err := agent.Script.Create(ctx, []context.Message{{Role: "user", Content: "return_empty"}})
+		if err != nil {
+			t.Fatalf("Failed to create with empty return: %s", err.Error())
+		}
+		if res == nil {
+			t.Fatalf("Expected non-nil response for empty object, got nil")
+		}
+		if len(res.Messages) != 0 {
+			t.Errorf("Expected empty messages, got: %d messages", len(res.Messages))
+		}
+	})
+
+	// Test scenario 4: Return full response with all fields
+	t.Run("ReturnFull", func(t *testing.T) {
+		res, err := agent.Script.Create(ctx, []context.Message{{Role: "user", Content: "return_full"}})
+		if err != nil {
+			t.Fatalf("Failed to create with full return: %s", err.Error())
+		}
+		if res == nil {
+			t.Fatalf("Expected non-nil response, got nil")
+		}
+
+		// Verify messages
+		if len(res.Messages) != 2 {
+			t.Errorf("Expected 2 messages, got: %d", len(res.Messages))
+		} else {
+			if res.Messages[0].Role != context.RoleSystem {
+				t.Errorf("Expected system role for first message, got: %s", res.Messages[0].Role)
+			}
+			if res.Messages[1].Role != context.RoleUser {
+				t.Errorf("Expected user role for second message, got: %s", res.Messages[1].Role)
+			}
+		}
+
+		// Verify audio config
+		if res.Audio == nil {
+			t.Error("Expected audio config, got nil")
+		} else {
+			if res.Audio.Voice != "alloy" {
+				t.Errorf("Expected voice 'alloy', got: %s", res.Audio.Voice)
+			}
+			if res.Audio.Format != "mp3" {
+				t.Errorf("Expected format 'mp3', got: %s", res.Audio.Format)
+			}
+		}
+
+		// Verify temperature
+		if res.Temperature == nil {
+			t.Error("Expected temperature, got nil")
+		} else if *res.Temperature != 0.7 {
+			t.Errorf("Expected temperature 0.7, got: %f", *res.Temperature)
+		}
+
+		// Verify max_tokens
+		if res.MaxTokens == nil {
+			t.Error("Expected max_tokens, got nil")
+		} else if *res.MaxTokens != 2000 {
+			t.Errorf("Expected max_tokens 2000, got: %d", *res.MaxTokens)
+		}
+
+		// Verify max_completion_tokens
+		if res.MaxCompletionTokens == nil {
+			t.Error("Expected max_completion_tokens, got nil")
+		} else if *res.MaxCompletionTokens != 1500 {
+			t.Errorf("Expected max_completion_tokens 1500, got: %d", *res.MaxCompletionTokens)
+		}
+
+		// Verify metadata
+		if res.Metadata == nil {
+			t.Error("Expected metadata, got nil")
+		} else {
+			if res.Metadata["test"] != "full_response" {
+				t.Errorf("Expected metadata['test'] = 'full_response', got: %s", res.Metadata["test"])
+			}
+			if res.Metadata["user_id"] != "test_user_123" {
+				t.Errorf("Expected metadata['user_id'] = 'test_user_123', got: %s", res.Metadata["user_id"])
+			}
+		}
+	})
+
+	// Test scenario 5: Return partial response
+	t.Run("ReturnPartial", func(t *testing.T) {
+		res, err := agent.Script.Create(ctx, []context.Message{{Role: "user", Content: "return_partial"}})
+		if err != nil {
+			t.Fatalf("Failed to create with partial return: %s", err.Error())
+		}
+		if res == nil {
+			t.Fatalf("Expected non-nil response, got nil")
+		}
+
+		// Verify messages
+		if len(res.Messages) != 1 {
+			t.Errorf("Expected 1 message, got: %d", len(res.Messages))
+		}
+
+		// Verify temperature
+		if res.Temperature == nil {
+			t.Error("Expected temperature, got nil")
+		} else if *res.Temperature != 0.5 {
+			t.Errorf("Expected temperature 0.5, got: %f", *res.Temperature)
+		}
+
+		// Verify optional fields are nil
+		if res.Audio != nil {
+			t.Errorf("Expected audio to be nil, got: %v", res.Audio)
+		}
+		if res.MaxTokens != nil {
+			t.Errorf("Expected max_tokens to be nil, got: %d", *res.MaxTokens)
+		}
+	})
+
+	// Test scenario 6: Process call - calls models.__yao.role.Get and adds to messages
+	t.Run("ReturnProcess", func(t *testing.T) {
+		res, err := agent.Script.Create(ctx, []context.Message{{Role: "user", Content: "return_process"}})
+		if err != nil {
+			t.Fatalf("Failed to create with process return: %s", err.Error())
+		}
+		if res == nil {
+			t.Fatalf("Expected non-nil response, got nil")
+		}
+
+		// Verify messages - should have at least 1 (system message)
+		if len(res.Messages) < 1 {
+			t.Errorf("Expected at least 1 message, got: %d", len(res.Messages))
+		} else {
+			// First message should be system role
+			if res.Messages[0].Role != context.RoleSystem {
+				t.Errorf("Expected system role for first message, got: %s", res.Messages[0].Role)
+			}
+			// Check system message content
+			if content, ok := res.Messages[0].Content.(string); ok {
+				if content != "Here are the available roles in the system:" {
+					t.Errorf("Unexpected system message content: %s", content)
+				}
+			}
+		}
+
+		// Verify metadata
+		if res.Metadata == nil {
+			t.Error("Expected metadata, got nil")
+		} else {
+			if res.Metadata["test"] != "process_call" {
+				t.Errorf("Expected metadata['test'] = 'process_call', got: %s", res.Metadata["test"])
+			}
+			// roles_count should be present
+			if _, ok := res.Metadata["roles_count"]; !ok {
+				t.Error("Expected metadata['roles_count'] to be present")
+			}
+		}
+	})
+
+	// Test scenario 7: Default response
+	t.Run("ReturnDefault", func(t *testing.T) {
+		testContent := "Hello, how are you?"
+		res, err := agent.Script.Create(ctx, []context.Message{{Role: "user", Content: testContent}})
+		if err != nil {
+			t.Fatalf("Failed to create with default return: %s", err.Error())
+		}
+		if res == nil {
+			t.Fatalf("Expected non-nil response, got nil")
+		}
+
+		// Verify messages
+		if len(res.Messages) != 1 {
+			t.Errorf("Expected 1 message, got: %d", len(res.Messages))
+		} else {
+			if res.Messages[0].Role != context.RoleUser {
+				t.Errorf("Expected user role, got: %s", res.Messages[0].Role)
+			}
+			if content, ok := res.Messages[0].Content.(string); ok {
+				if content != testContent {
+					t.Errorf("Expected content '%s', got: '%s'", testContent, content)
+				}
+			} else {
+				t.Errorf("Expected string content, got: %T", res.Messages[0].Content)
+			}
+		}
+	})
 }
diff --git a/agent/context/types.go b/agent/context/types.go
index c443c1f2..1e383232 100644
--- a/agent/context/types.go
+++ b/agent/context/types.go
@@ -184,15 +184,30 @@ type Stack struct {
 // Response the response
 // 100% compatible with the OpenAI API
 type Response struct {
-	Create     *ResponseHookCreate   `json:"create,omitempty"`
+	Create     *HookCreateResponse   `json:"create,omitempty"`
 	MCP        *ResponseHookMCP      `json:"mcp,omitempty"`
 	Done       *ResponseHookDone     `json:"done,omitempty"`
 	Failback   *ResponseHookFailback `json:"failback,omitempty"`
 	Completion *ResponseCompletion   `json:"completion,omitempty"`
 }
 
-// ResponseHookCreate the response of the create hook
-type ResponseHookCreate struct{}
+// HookCreateResponse the response of the create hook
+type HookCreateResponse struct {
+
+	// Messages to be sent to the assistant
+	Messages []Message `json:"messages,omitempty"`
+
+	// Audio configuration (for models that support audio output)
+	Audio *AudioConfig `json:"audio,omitempty"`
+
+	// Generation parameters
+	Temperature         *float64 `json:"temperature,omitempty"`
+	MaxTokens           *int     `json:"max_tokens,omitempty"`
+	MaxCompletionTokens *int     `json:"max_completion_tokens,omitempty"`
+
+	// Request metadata
+	Metadata map[string]string `json:"metadata,omitempty"` // Optional: developer-defined tags and values for tracking requests
+}
 
 // ResponseHookDone the response of the done hook
 type ResponseHookDone struct{}