diff --git a/agent/assistant/agent.go b/agent/assistant/agent.go
index 0e32c212..85417c31 100644
--- a/agent/assistant/agent.go
+++ b/agent/assistant/agent.go
@@ -1,9 +1,14 @@
 package assistant
 
-import "github.com/yaoapp/yao/agent/context"
+import (
+	"github.com/yaoapp/yao/agent/context"
+	"github.com/yaoapp/yao/agent/llm"
+)
 
 // Stream stream the agent
-func (ast *Assistant) Stream(ctx *context.Context, messages []context.Message, handler context.StreamFunc) error {
+func (ast *Assistant) Stream(ctx *context.Context, inputMessages []context.Message, handler context.StreamFunc) (*context.Response, error) {
+
+	var err error
 
 	// Initialize stack and auto-handle completion/failure/restore
 	_, traceID, done := context.EnterStack(ctx, ast.ID, ctx.Referer)
@@ -11,23 +16,85 @@ func (ast *Assistant) Stream(ctx *context.Context, messages []context.Message, h
 
 	_ = traceID // traceID is available for trace logging
 
+	// Full input messages with chat history
+	fullMessages, err := ast.WithHistory(ctx, inputMessages)
+	if err != nil {
+		return nil, err
+	}
+
 	// Request Create hook ( Optional )
+	var createResponse *context.ResponseHookCreate
+	if ast.Script != nil {
+		var err error
+		createResponse, err = ast.Script.Create(ctx, fullMessages)
+		if err != nil {
+			return nil, err
+		}
+	}
+	_ = createResponse // createResponse is available for further processing
+
+	var completionOptions *llm.CompletionOptions // default is nil
 
 	// LLM Call Stream ( Optional )
+	var completionMessages []context.Message
+	var completionResponse *context.ResponseCompletion
+	if ast.Prompts != nil || ast.MCP != nil {
+		llm, err := llm.New(ast.GetConnector(ctx))
+		if err != nil {
+			return nil, err
+		}
+
+		// Build the LLM request
+		completionMessages, completionOptions, err = ast.BuildLLMRequest(ctx, inputMessages, createResponse)
+		if err != nil {
+			return nil, err
+		}
+
+		// Call the LLM Completion Stream
+		completionResponse, err = llm.Stream(ctx, completionMessages, completionOptions, handler)
+		if err != nil {
+			return nil, err
+		}
+
+	}
+
+	// Request MCP hook ( Optional )
+	var mcpResponse *context.ResponseHookMCP
+	if ast.MCP != nil {
+		_ = mcpResponse // mcpResponse is available for further processing
+
+		// MCP Execution Loop
+	}
 
 	// Request Done hook ( Optional )
+	var doneResponse *context.ResponseHookDone
+	if ast.Script != nil {
+		var err error
+		doneResponse, err = ast.Script.Done(ctx, fullMessages, completionResponse, mcpResponse)
+		if err != nil {
+			return nil, err
+		}
+	}
 
-	return nil
+	_ = doneResponse // doneResponse is available for further processing
+
+	return &context.Response{Create: createResponse, Done: doneResponse, Completion: completionResponse}, nil
 }
 
-// Run run the agent
-func (ast *Assistant) Run(ctx *context.Context, messages []context.Message) (*context.Response, error) {
-
-	// Initialize stack and auto-handle completion/failure/restore
-	_, traceID, done := context.EnterStack(ctx, ast.ID, ctx.Referer)
-	defer done()
-
-	_ = traceID // traceID is available for trace logging
-
-	return &context.Response{}, nil
+// GetConnector get the connector from the context
+func (ast *Assistant) GetConnector(ctx *context.Context) string {
+	if ctx.Connector != "" {
+		return ctx.Connector
+	}
+	return ast.Connector
+}
+
+// BuildLLMRequest build the LLM request
+func (ast *Assistant) BuildLLMRequest(ctx *context.Context, messages []context.Message, createResponse *context.ResponseHookCreate) ([]context.Message, *llm.CompletionOptions, error) {
+	return messages, nil, nil
+}
+
+// WithHistory with the history messages
+func (ast *Assistant) WithHistory(ctx *context.Context, messages []context.Message) ([]context.Message, error) {
+	return messages, nil
 }
diff --git a/agent/assistant/hook/create.go b/agent/assistant/hook/create.go
new file mode 100644
index 00000000..1d5fec4f
--- /dev/null
+++ b/agent/assistant/hook/create.go
@@ -0,0 +1,8 @@
+package hook
+
+import "github.com/yaoapp/yao/agent/context"
+
+// Create create a new assistant
+func (s *Script) Create(ctx *context.Context, messages []context.Message) (*context.ResponseHookCreate, error) {
+	return &context.ResponseHookCreate{}, nil
+}
diff --git a/agent/assistant/hook/done.go b/agent/assistant/hook/done.go
new file mode 100644
index 00000000..69e990a9
--- /dev/null
+++ b/agent/assistant/hook/done.go
@@ -0,0 +1,10 @@
+package hook
+
+import (
+	"github.com/yaoapp/yao/agent/context"
+)
+
+// Done done hook
+func (s *Script) Done(ctx *context.Context, inputMessages []context.Message, completionResponse *context.ResponseCompletion, mcpResponse *context.ResponseHookMCP) (*context.ResponseHookDone, error) {
+	return &context.ResponseHookDone{}, nil
+}
diff --git a/agent/assistant/hook/failback.go b/agent/assistant/hook/failback.go
new file mode 100644
index 00000000..0b345cf4
--- /dev/null
+++ b/agent/assistant/hook/failback.go
@@ -0,0 +1,8 @@
+package hook
+
+import "github.com/yaoapp/yao/agent/context"
+
+// Failback failback hook
+func (s *Script) Failback(ctx *context.Context, inputMessages []context.Message, completionResponse *context.ResponseCompletion) (*context.ResponseHookFailback, error) {
+	return &context.ResponseHookFailback{}, nil
+}
diff --git a/agent/assistant/hook/hook.go b/agent/assistant/hook/hook.go
new file mode 100644
index 00000000..67dcf257
--- /dev/null
+++ b/agent/assistant/hook/hook.go
@@ -0,0 +1 @@
+package hook
diff --git a/agent/assistant/hook/mcp.go b/agent/assistant/hook/mcp.go
new file mode 100644
index 00000000..0e0ba6cc
--- /dev/null
+++ b/agent/assistant/hook/mcp.go
@@ -0,0 +1,8 @@
+package hook
+
+import "github.com/yaoapp/yao/agent/context"
+
+// MCP MCP hook
+func (s *Script) MCP(ctx *context.Context, messages []context.Message) (*context.ResponseHookMCP, error) {
+	return &context.ResponseHookMCP{}, nil
+}
diff --git a/agent/assistant/hook/script.go b/agent/assistant/hook/script.go
new file mode 100644
index 00000000..67dcf257
--- /dev/null
+++ b/agent/assistant/hook/script.go
@@ -0,0 +1 @@
+package hook
diff --git a/agent/assistant/hook/types.go b/agent/assistant/hook/types.go
new file mode 100644
index 00000000..72cb34b2
--- /dev/null
+++ b/agent/assistant/hook/types.go
@@ -0,0 +1,10 @@
+package hook
+
+import (
+	v8 "github.com/yaoapp/gou/runtime/v8"
+)
+
+// Script the script hook align
+type Script struct {
+	*v8.Script
+}
diff --git a/agent/assistant/hooks/hooks.go b/agent/assistant/hooks/hooks.go
deleted file mode 100644
index 6de678e5..00000000
--- a/agent/assistant/hooks/hooks.go
+++ /dev/null
@@ -1 +0,0 @@
-package hooks
diff --git a/agent/assistant/load.go b/agent/assistant/load.go
index a6ed26be..236ad3ab 100644
--- a/agent/assistant/load.go
+++ b/agent/assistant/load.go
@@ -13,6 +13,7 @@ import (
 	"github.com/yaoapp/gou/application"
 	"github.com/yaoapp/gou/fs"
 	v8 "github.com/yaoapp/gou/runtime/v8"
+	"github.com/yaoapp/yao/agent/assistant/hook"
 	"github.com/yaoapp/yao/agent/i18n"
 	store "github.com/yaoapp/yao/agent/store/types"
 	agentvision "github.com/yaoapp/yao/agent/vision"
@@ -106,9 +107,7 @@ func LoadBuiltIn() error {
 		loaded.Put(assistant)
 
 		// Remove the built-in assistant from the store
-		if _, ok := deletedBuiltIn[assistant.ID]; ok {
-			delete(deletedBuiltIn, assistant.ID)
-		}
+		delete(deletedBuiltIn, assistant.ID)
 	}
 
 	// Remove deleted built-in assistants
@@ -290,16 +289,16 @@ func LoadPath(path string) (*Assistant, error) {
 		data["updated_at"] = max(updatedAt, ts)
 	}
 
-	// load tools
-	toolsfile := filepath.Join(path, "tools.yao")
-	if has, _ := app.Exists(toolsfile); has {
-		tools, ts, err := loadTools(toolsfile)
-		if err != nil {
-			return nil, err
-		}
-		data["tools"] = tools
-		updatedAt = max(updatedAt, ts)
-	}
+	// load tools, deprecated, use mcp instead
+	// toolsfile := filepath.Join(path, "tools.yao")
+	// if has, _ := app.Exists(toolsfile); has {
+	// 	tools, ts, err := loadTools(toolsfile)
+	// 	if err != nil {
+	// 		return nil, err
+	// 	}
+	// 	data["tools"] = tools
+	// 	updatedAt = max(updatedAt, ts)
+	// }
 
 	// i18ns
 	locales, err := i18n.GetLocales(path)
@@ -430,6 +429,9 @@ func loadMap(data map[string]interface{}) (*Assistant, error) {
 			}
 			assistant.Tags = tags
 
+		case string:
+			assistant.Tags = []string{vv}
+
 		case interface{}:
 			raw, err := jsoniter.Marshal(vv)
 			if err != nil {
@@ -442,8 +444,6 @@ func loadMap(data map[string]interface{}) (*Assistant, error) {
 			}
 			assistant.Tags = tags
 
-		case string:
-			assistant.Tags = []string{vv}
 		}
 	}
 
@@ -571,9 +571,11 @@ func loadMap(data map[string]interface{}) (*Assistant, error) {
 			if err != nil {
 				return nil, err
 			}
-			assistant.Script = script
-		case *v8.Script:
+			assistant.Script = &hook.Script{Script: script}
+		case *hook.Script:
 			assistant.Script = v
+		case *v8.Script:
+			assistant.Script = &hook.Script{Script: v}
 		}
 	}
 
@@ -641,7 +643,7 @@ func loadPrompts(file string, root string) (string, int64, error) {
 	return string(prompts), ts.UnixNano(), nil
 }
 
-func loadScript(file string, root string) (*v8.Script, int64, error) {
+func loadScript(file string, root string) (*hook.Script, int64, error) {
 
 	app, err := fs.Get("app")
 	if err != nil {
@@ -658,7 +660,7 @@ func loadScript(file string, root string) (*v8.Script, int64, error) {
 		return nil, 0, err
 	}
 
-	return script, ts.UnixNano(), nil
+	return &hook.Script{Script: script}, ts.UnixNano(), nil
 }
 
 func loadScriptSource(source string, file string) (*v8.Script, error) {
diff --git a/agent/assistant/types.go b/agent/assistant/types.go
index fc188482..46f0962d 100644
--- a/agent/assistant/types.go
+++ b/agent/assistant/types.go
@@ -5,7 +5,7 @@ import (
 	"io"
 
 	"github.com/gin-gonic/gin"
-	v8 "github.com/yaoapp/gou/runtime/v8"
+	"github.com/yaoapp/yao/agent/assistant/hook"
 	chatctx "github.com/yaoapp/yao/agent/context"
 	"github.com/yaoapp/yao/agent/message"
 	store "github.com/yaoapp/yao/agent/store/types"
@@ -96,16 +96,16 @@ type QueryParam struct {
 type Assistant struct {
 	store.AssistantModel
 	Search *SearchOption `json:"search,omitempty" yaml:"search,omitempty"` // Whether this assistant supports search
-	Script *v8.Script    `json:"-" yaml:"-"`                               // Assistant Script
+	Script *hook.Script  `json:"-" yaml:"-"`                               // Assistant Script
 
 	// Internal
 	// ===============================
-	openai       *api.OpenAI // OpenAI API
-	search       bool        // Whether this assistant supports search
-	vision       bool        // Whether this assistant supports vision
-	toolCalls    bool        // Whether this assistant supports tool_calls
-	initHook     bool        // Whether this assistant has an init hook
-	runtimeTools []Tool      // Converted tools for business logic (OpenAI format)
+	openai *api.OpenAI // OpenAI API
+	search bool        // Whether this assistant supports search
+	vision bool        // Whether this assistant supports vision
+	// toolCalls    bool        // Whether this assistant supports tool_calls
+	initHook     bool   // Whether this assistant has an init hook
+	runtimeTools []Tool // Converted tools for business logic (OpenAI format)
 }
 
 // ConnectorSetting the connector setting
diff --git a/agent/context/types.go b/agent/context/types.go
index 74068f14..c443c1f2 100644
--- a/agent/context/types.go
+++ b/agent/context/types.go
@@ -131,6 +131,8 @@ type Context struct {
 	ChatID      string                `json:"chat_id,omitempty"`      // Chat ID, use to select chat
 	AssistantID string                `json:"assistant_id,omitempty"` // Assistant ID, use to select assistant
 	Sid         string                `json:"sid" yaml:"-"`           // Session ID (Deprecated, use Authorized instead)
+	Connector   string                `json:"connector,omitempty"`    // Connector, use to select the connector of the LLM Model, Default is Assistant.Connector
+	Search      *bool                 `json:"search,omitempty"`       // Search mode, default is true
 
 	// Arguments for call
 	Args       []interface{} `json:"args,omitempty"`        // Arguments for call, it will be used to pass data to the call
@@ -181,7 +183,28 @@ type Stack struct {
 
 // Response the response
 // 100% compatible with the OpenAI API
-type Response struct{}
+type Response struct {
+	Create     *ResponseHookCreate   `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{}
+
+// ResponseHookDone the response of the done hook
+type ResponseHookDone struct{}
+
+// ResponseHookMCP the response of the mcp hook
+type ResponseHookMCP struct{}
+
+// ResponseHookFailback the response of the failback hook
+type ResponseHookFailback struct{}
+
+// ResponseCompletion the response of the completion
+type ResponseCompletion struct{}
 
 // Message Structure ( OpenAI Chat Completion Input Message Structure, https://platform.openai.com/docs/api-reference/chat/create#chat/create-messages )
 // ===============================
diff --git a/agent/llm/interfaces.go b/agent/llm/interfaces.go
new file mode 100644
index 00000000..53562b40
--- /dev/null
+++ b/agent/llm/interfaces.go
@@ -0,0 +1,9 @@
+package llm
+
+import "github.com/yaoapp/yao/agent/context"
+
+// LLM the LLM interface
+type LLM interface {
+	Stream(ctx *context.Context, messages []context.Message, options *CompletionOptions, handler context.StreamFunc) (*context.ResponseCompletion, error)
+	Post(ctx *context.Context, messages []context.Message, options *CompletionOptions) (*context.ResponseCompletion, error)
+}
diff --git a/agent/llm/llm.go b/agent/llm/llm.go
index 006c3ded..4e4c1be3 100644
--- a/agent/llm/llm.go
+++ b/agent/llm/llm.go
@@ -1 +1,6 @@
 package llm
+
+// New create a new LLM instance
+func New(connector string) (LLM, error) {
+	return nil, nil
+}
diff --git a/agent/llm/types.go b/agent/llm/types.go
new file mode 100644
index 00000000..764efb7a
--- /dev/null
+++ b/agent/llm/types.go
@@ -0,0 +1,4 @@
+package llm
+
+// CompletionOptions the completion request
+type CompletionOptions struct{}