diff --git a/internal/ai/runtime/executor/event_consumer.go b/internal/ai/runtime/executor/event_consumer.go
index 2ec4a67..d5f57f9 100644
--- a/internal/ai/runtime/executor/event_consumer.go
+++ b/internal/ai/runtime/executor/event_consumer.go
@@ -18,6 +18,7 @@ func consumeAgentEvents(events *adk.AsyncIterator[*adk.AgentEvent], summary *Run
 	if collector == nil {
 		collector = callbacks.NewRuntimeTraceCollector()
 	}
+	suppressAssistantReply := false
 	for {
 		event, ok := events.Next()
 		if !ok {
@@ -44,6 +45,9 @@ func consumeAgentEvents(events *adk.AsyncIterator[*adk.AgentEvent], summary *Run
 		messageOutput := event.Output.MessageOutput
 		switch messageOutput.Role {
 		case schema.Assistant:
+			if suppressAssistantReply {
+				continue
+			}
 			replyText := strings.TrimSpace(messageOutput.Message.Content)
 			if replyText != "" {
 				summary.ReplyText = replyText
@@ -62,6 +66,8 @@ func consumeAgentEvents(events *adk.AsyncIterator[*adk.AgentEvent], summary *Run
 				toolReplyText := strings.TrimSpace(messageOutput.Message.Content)
 				if toolReplyText != "" {
 					summary.ReplyText = toolReplyText
+				} else if toolCode == toolx.GraphHandoffConversation.Code {
+					suppressAssistantReply = true
 				}
 			}
 		}
diff --git a/internal/ai/runtime/executor/event_consumer_test.go b/internal/ai/runtime/executor/event_consumer_test.go
index 59bfcdb..0450639 100644
--- a/internal/ai/runtime/executor/event_consumer_test.go
+++ b/internal/ai/runtime/executor/event_consumer_test.go
@@ -70,3 +70,44 @@ func TestConsumeAgentEventsCompletesGraphToolWithNoVisibleReply(t *testing.T) {
 		t.Fatalf("unexpected summary status: %q", summary.Status)
 	}
 }
+
+func TestConsumeAgentEventsSuppressesAssistantReplyAfterSilentHandoffTool(t *testing.T) {
+	summary := &RunResult{
+		Status:           "started",
+		InvokedToolCodes: make([]string, 0),
+	}
+	events, gen := adk.NewAsyncIteratorPair[*adk.AgentEvent]()
+	gen.Send(&adk.AgentEvent{
+		Output: &adk.AgentOutput{
+			MessageOutput: &adk.MessageVariant{
+				Role:     schema.Tool,
+				ToolName: toolx.GraphHandoffConversation.Name,
+				Message: &schema.Message{
+					Content: "",
+				},
+			},
+		},
+	})
+	gen.Send(&adk.AgentEvent{
+		Output: &adk.AgentOutput{
+			MessageOutput: &adk.MessageVariant{
+				Role: schema.Assistant,
+				Message: &schema.Message{
+					Content: "好的，已为您发起转接人工客服的请求。系统正在为您确认，请稍候。",
+				},
+			},
+		},
+	})
+	gen.Close()
+
+	consumeAgentEvents(events, summary, nil, map[string]string{
+		toolx.GraphHandoffConversation.Name: toolx.GraphHandoffConversation.Code,
+	})
+
+	if summary.ReplyText != "" {
+		t.Fatalf("expected assistant reply after silent handoff to be suppressed, got %q", summary.ReplyText)
+	}
+	if summary.Status != "completed" {
+		t.Fatalf("unexpected summary status: %q", summary.Status)
+	}
+}
diff --git a/internal/ai/runtime/graphs/handoff_graph.go b/internal/ai/runtime/graphs/handoff_graph.go
index 3ba353d..289f791 100644
--- a/internal/ai/runtime/graphs/handoff_graph.go
+++ b/internal/ai/runtime/graphs/handoff_graph.go
@@ -50,6 +50,10 @@ func (g *HandoffGraph) Run(ctx context.Context, argumentsInJSON string) (string,
 		if err != nil {
 			return "", err
 		}
+		handled, err := services.ConversationService.TryOffHoursHandoffByAI(g.conversation.ID, g.aiAgent, reason)
+		if err != nil || handled {
+			return "", err
+		}
 		info := HandoffGraphInterruptInfo{
 			Type:    InterruptTypeHandoffConfirmation,
 			Message: g.buildConfirmationPrompt(reason),
diff --git a/internal/ai/runtime/graphs/handoff_graph_test.go b/internal/ai/runtime/graphs/handoff_graph_test.go
new file mode 100644
index 0000000..0315a35
--- /dev/null
+++ b/internal/ai/runtime/graphs/handoff_graph_test.go
@@ -0,0 +1,169 @@
+package graphs
+
+import (
+	"context"
+	"strings"
+	"testing"
+	"time"
+
+	"cs-agent/internal/models"
+	"cs-agent/internal/pkg/enums"
+	"cs-agent/internal/services"
+
+	"github.com/glebarez/sqlite"
+	"github.com/mlogclub/simple/sqls"
+	"gorm.io/gorm"
+	"gorm.io/gorm/schema"
+)
+
+func TestHandoffGraphOffHoursSendsNoticeWithoutConfirmation(t *testing.T) {
+	db := setupHandoffGraphTestDB(t)
+	aiAgent := createHandoffGraphAIAgent(t, db, "1")
+	conversation := createHandoffGraphConversation(t, db, aiAgent.ID)
+
+	reply, err := NewHandoffGraph(conversation, aiAgent).Run(context.Background(), `{"reason":"用户要求转人工"}`)
+	if err != nil {
+		t.Fatalf("Run() error = %v", err)
+	}
+	if reply != "" {
+		t.Fatalf("expected no graph reply, got %q", reply)
+	}
+
+	message := services.MessageService.FindOne(sqls.NewCnd().Eq("conversation_id", conversation.ID).Desc("id"))
+	if message == nil {
+		t.Fatalf("expected off-hours notice message")
+	}
+	if message.Content != services.HandoffOffHoursMessage {
+		t.Fatalf("expected off-hours notice, got %q", message.Content)
+	}
+
+	current := services.ConversationService.Get(conversation.ID)
+	if current == nil {
+		t.Fatalf("expected conversation")
+	}
+	if current.Status != enums.IMConversationStatusAIServing {
+		t.Fatalf("expected conversation to stay ai-serving, got %d", current.Status)
+	}
+	if current.HandoffAt != nil {
+		t.Fatalf("expected handoff_at to remain nil, got %v", current.HandoffAt)
+	}
+}
+
+func TestHandoffGraphWithActiveScheduleStillRequestsConfirmation(t *testing.T) {
+	db := setupHandoffGraphTestDB(t)
+	aiAgent := createHandoffGraphAIAgent(t, db, "1")
+	createHandoffGraphTeam(t, db, 1)
+	createHandoffGraphActiveSchedule(t, db, 1)
+	conversation := createHandoffGraphConversation(t, db, aiAgent.ID)
+
+	reply, err := NewHandoffGraph(conversation, aiAgent).Run(context.Background(), `{"reason":"用户要求转人工"}`)
+	if err == nil {
+		t.Fatalf("expected confirmation interrupt")
+	}
+	if !strings.Contains(err.Error(), InterruptTypeHandoffConfirmation) {
+		t.Fatalf("expected handoff confirmation interrupt, got %v", err)
+	}
+	if reply != "" {
+		t.Fatalf("expected no reply before confirmation, got %q", reply)
+	}
+
+	var count int64
+	if err := db.Model(&models.Message{}).Where("conversation_id = ?", conversation.ID).Count(&count).Error; err != nil {
+		t.Fatalf("count messages error = %v", err)
+	}
+	if count != 0 {
+		t.Fatalf("expected no notice before confirmation, got %d messages", count)
+	}
+}
+
+func setupHandoffGraphTestDB(t *testing.T) *gorm.DB {
+	t.Helper()
+
+	dbName := strings.NewReplacer("/", "_", " ", "_").Replace(t.Name())
+	db, err := gorm.Open(sqlite.Open("file:"+dbName+"?mode=memory&cache=shared"), &gorm.Config{
+		NamingStrategy: schema.NamingStrategy{
+			TablePrefix:   "t_",
+			SingularTable: true,
+		},
+	})
+	if err != nil {
+		t.Fatalf("open sqlite error = %v", err)
+	}
+	t.Cleanup(func() {
+		sqlDB, err := db.DB()
+		if err == nil {
+			_ = sqlDB.Close()
+		}
+	})
+	if err := db.AutoMigrate(
+		&models.AIAgent{},
+		&models.AgentTeam{},
+		&models.AgentTeamSchedule{},
+		&models.Conversation{},
+		&models.ConversationEventLog{},
+		&models.ConversationReadState{},
+		&models.Message{},
+		&models.ChannelMessageOutbox{},
+	); err != nil {
+		t.Fatalf("auto migrate error = %v", err)
+	}
+	sqls.SetDB(db)
+	return db
+}
+
+func createHandoffGraphAIAgent(t *testing.T, db *gorm.DB, teamIDs string) models.AIAgent {
+	t.Helper()
+
+	item := models.AIAgent{
+		Name:        "测试AI",
+		ServiceMode: enums.IMConversationServiceModeAIFirst,
+		TeamIDs:     teamIDs,
+		Status:      enums.StatusOk,
+	}
+	if err := db.Create(&item).Error; err != nil {
+		t.Fatalf("create ai agent error = %v", err)
+	}
+	return item
+}
+
+func createHandoffGraphTeam(t *testing.T, db *gorm.DB, id int64) {
+	t.Helper()
+
+	if err := db.Create(&models.AgentTeam{ID: id, Name: "售后支持组", Status: enums.StatusOk}).Error; err != nil {
+		t.Fatalf("create team error = %v", err)
+	}
+}
+
+func createHandoffGraphActiveSchedule(t *testing.T, db *gorm.DB, teamID int64) {
+	t.Helper()
+
+	now := time.Now()
+	if err := db.Create(&models.AgentTeamSchedule{
+		TeamID:  teamID,
+		StartAt: now.Add(-time.Hour),
+		EndAt:   now.Add(time.Hour),
+		Status:  enums.StatusOk,
+	}).Error; err != nil {
+		t.Fatalf("create schedule error = %v", err)
+	}
+}
+
+func createHandoffGraphConversation(t *testing.T, db *gorm.DB, aiAgentID int64) models.Conversation {
+	t.Helper()
+
+	now := time.Now()
+	item := models.Conversation{
+		AIAgentID:     aiAgentID,
+		ChannelID:     1,
+		CustomerID:    1,
+		CustomerName:  "测试访客",
+		Status:        enums.IMConversationStatusAIServing,
+		ServiceMode:   enums.IMConversationServiceModeAIFirst,
+		LastMessageAt: now,
+		LastActiveAt:  now,
+	}
+	if err := db.Create(&item).Error; err != nil {
+		t.Fatalf("create conversation error = %v", err)
+	}
+	return item
+}
diff --git a/internal/services/conversation_human_dispatch_service.go b/internal/services/conversation_human_dispatch_service.go
index 2910483..74e7a22 100644
--- a/internal/services/conversation_human_dispatch_service.go
+++ b/internal/services/conversation_human_dispatch_service.go
@@ -45,6 +45,25 @@ func newConversationHumanDispatchService() *conversationHumanDispatchService {
 	return &conversationHumanDispatchService{}
 }
 
+func (s *conversationHumanDispatchService) TryOffHoursHandoffByAI(conversationID int64, aiAgent models.AIAgent, reason string) (bool, error) {
+	conversation := ConversationService.Get(conversationID)
+	if conversation == nil {
+		return false, errorsx.InvalidParam("会话不存在")
+	}
+	teamIDs := orderedPositiveIDs(aiAgent.TeamIDs)
+	activeTeamIDs := ConversationDispatchService.findActiveScheduleTeamIDs(teamIDs, time.Now())
+	if len(activeTeamIDs) > 0 {
+		return false, nil
+	}
+	if err := s.createEvent(conversationID, enums.IMEventTypeTransfer, enums.IMSenderTypeAI, aiAgent.ID, "转人工失败：非服务时间", strings.TrimSpace(reason)); err != nil {
+		return true, err
+	}
+	if err := s.sendAIText(conversationID, aiAgent.ID, HandoffOffHoursMessage); err != nil {
+		return true, err
+	}
+	return true, nil
+}
+
 func (s *conversationHumanDispatchService) HandoffByAI(conversationID int64, aiAgent models.AIAgent, reason string) (*HandoffDecisionResult, error) {
 	conversation := ConversationService.Get(conversationID)
 	if conversation == nil {
@@ -53,10 +72,7 @@ func (s *conversationHumanDispatchService) HandoffByAI(conversationID int64, aiA
 	teamIDs := orderedPositiveIDs(aiAgent.TeamIDs)
 	activeTeamIDs := ConversationDispatchService.findActiveScheduleTeamIDs(teamIDs, time.Now())
 	if len(activeTeamIDs) == 0 {
-		if err := s.createEvent(conversationID, enums.IMEventTypeTransfer, enums.IMSenderTypeAI, aiAgent.ID, "转人工失败：非服务时间", strings.TrimSpace(reason)); err != nil {
-			return nil, err
-		}
-		if err := s.sendAIText(conversationID, aiAgent.ID, HandoffOffHoursMessage); err != nil {
+		if _, err := s.TryOffHoursHandoffByAI(conversationID, aiAgent, reason); err != nil {
 			return nil, err
 		}
 		return &HandoffDecisionResult{Decision: HandoffDecisionOffHours, Message: HandoffOffHoursMessage}, nil
diff --git a/internal/services/conversation_service.go b/internal/services/conversation_service.go
index 11cbd8e..3627a98 100644
--- a/internal/services/conversation_service.go
+++ b/internal/services/conversation_service.go
@@ -360,6 +360,20 @@ func (s *conversationService) HandoffByAI(conversationID int64, aiAgent models.A
 	return err
 }
 
+func (s *conversationService) TryOffHoursHandoffByAI(conversationID int64, aiAgent models.AIAgent, reason string) (bool, error) {
+	if conversationID <= 0 {
+		return false, errorsx.InvalidParam("会话不存在")
+	}
+	handled, err := ConversationHumanDispatchService.TryOffHoursHandoffByAI(conversationID, aiAgent, reason)
+	if err != nil {
+		slog.Warn("off-hours ai handoff failed",
+			"conversation_id", conversationID,
+			"ai_agent_id", aiAgent.ID,
+			"error", err)
+	}
+	return handled, err
+}
+
 func (s *conversationService) CloseConversation(conversationID int64, closeReason string, operator *dto.AuthPrincipal) error {
 	if operator == nil {
 		return errorsx.Unauthorized("未登录或登录已过期")