diff --git a/pkg/agent/agent_message.go b/pkg/agent/agent_message.go
index 96b0b0817..f884d4cfb 100644
--- a/pkg/agent/agent_message.go
+++ b/pkg/agent/agent_message.go
@@ -15,6 +15,15 @@ import (
 	"github.com/sipeed/picoclaw/pkg/utils"
 )
 
+const (
+	systemFollowUpOriginChannelKey          = "origin_channel"
+	systemFollowUpOriginChatIDKey           = "origin_chat_id"
+	systemFollowUpOriginChatTypeKey         = "origin_chat_type"
+	systemFollowUpOriginTopicIDKey          = "origin_topic_id"
+	systemFollowUpOriginMessageIDKey        = "origin_message_id"
+	systemFollowUpOriginReplyToMessageIDKey = "origin_reply_to_message_id"
+)
+
 func (al *AgentLoop) buildContinuationTarget(msg bus.InboundMessage) (*continuationTarget, error) {
 	if msg.Channel == "system" {
 		return nil, nil
@@ -227,6 +236,42 @@ func (al *AgentLoop) allocateRouteSession(route routing.ResolvedRoute, msg bus.I
 	})
 }
 
+func originTopicID(origin *bus.InboundContext) string {
+	if origin == nil {
+		return ""
+	}
+	return strings.TrimSpace(origin.TopicID)
+}
+
+func systemFollowUpOriginRaw(origin *bus.InboundContext, channel, chatID string) map[string]string {
+	raw := map[string]string{
+		systemFollowUpOriginChannelKey: strings.TrimSpace(channel),
+		systemFollowUpOriginChatIDKey:  strings.TrimSpace(chatID),
+	}
+	if origin == nil {
+		return raw
+	}
+	if origin.Channel != "" {
+		raw[systemFollowUpOriginChannelKey] = strings.TrimSpace(origin.Channel)
+	}
+	if origin.ChatID != "" {
+		raw[systemFollowUpOriginChatIDKey] = strings.TrimSpace(origin.ChatID)
+	}
+	if origin.ChatType != "" {
+		raw[systemFollowUpOriginChatTypeKey] = strings.TrimSpace(origin.ChatType)
+	}
+	if origin.TopicID != "" {
+		raw[systemFollowUpOriginTopicIDKey] = strings.TrimSpace(origin.TopicID)
+	}
+	if origin.MessageID != "" {
+		raw[systemFollowUpOriginMessageIDKey] = strings.TrimSpace(origin.MessageID)
+	}
+	if origin.ReplyToMessageID != "" {
+		raw[systemFollowUpOriginReplyToMessageIDKey] = strings.TrimSpace(origin.ReplyToMessageID)
+	}
+	return raw
+}
+
 func (al *AgentLoop) processSystemMessage(
 	ctx context.Context,
 	msg bus.InboundMessage,
@@ -253,6 +298,30 @@ func (al *AgentLoop) processSystemMessage(
 		originChannel = "cli"
 		originChatID = msg.ChatID
 	}
+	originChatType := "direct"
+	originTopicID := strings.TrimSpace(msg.Context.TopicID)
+	originMessageID := strings.TrimSpace(msg.Context.MessageID)
+	originReplyToMessageID := strings.TrimSpace(msg.Context.ReplyToMessageID)
+	if raw := msg.Context.Raw; len(raw) > 0 {
+		if value := strings.TrimSpace(raw[systemFollowUpOriginChannelKey]); value != "" {
+			originChannel = value
+		}
+		if value := strings.TrimSpace(raw[systemFollowUpOriginChatIDKey]); value != "" {
+			originChatID = value
+		}
+		if value := strings.TrimSpace(raw[systemFollowUpOriginChatTypeKey]); value != "" {
+			originChatType = value
+		}
+		if value := strings.TrimSpace(raw[systemFollowUpOriginTopicIDKey]); value != "" {
+			originTopicID = value
+		}
+		if value := strings.TrimSpace(raw[systemFollowUpOriginMessageIDKey]); value != "" {
+			originMessageID = value
+		}
+		if value := strings.TrimSpace(raw[systemFollowUpOriginReplyToMessageIDKey]); value != "" {
+			originReplyToMessageID = value
+		}
+	}
 
 	// Extract subagent result from message content
 	// Format: "Task 'label' completed.\n\nResult:\n<actual content>"
@@ -286,10 +355,13 @@ func (al *AgentLoop) processSystemMessage(
 	}
 	if originChannel != "" || originChatID != "" {
 		dispatch.InboundContext = &bus.InboundContext{
-			Channel:  originChannel,
-			ChatID:   originChatID,
-			ChatType: "direct",
-			SenderID: msg.SenderID,
+			Channel:          originChannel,
+			ChatID:           originChatID,
+			ChatType:         originChatType,
+			TopicID:          originTopicID,
+			SenderID:         msg.SenderID,
+			MessageID:        originMessageID,
+			ReplyToMessageID: originReplyToMessageID,
 		}
 	}
 
diff --git a/pkg/agent/agent_test.go b/pkg/agent/agent_test.go
index a75919912..914bea682 100644
--- a/pkg/agent/agent_test.go
+++ b/pkg/agent/agent_test.go
@@ -2518,6 +2518,64 @@ func TestProcessMessage_UsesRouteSessionKey(t *testing.T) {
 	}
 }
 
+func TestProcessSystemMessage_PreservesOriginTopicOnFinalResponse(t *testing.T) {
+	tmpDir := t.TempDir()
+
+	cfg := &config.Config{
+		Agents: config.AgentsConfig{
+			Defaults: config.AgentDefaults{
+				Workspace:         tmpDir,
+				ModelName:         "test-model",
+				MaxTokens:         4096,
+				MaxToolIterations: 10,
+			},
+		},
+	}
+
+	msgBus := bus.NewMessageBus()
+	provider := &simpleMockProvider{response: "follow-up response"}
+	al := NewAgentLoop(cfg, msgBus, provider)
+
+	msg := testInboundMessage(bus.InboundMessage{
+		Context: bus.InboundContext{
+			Channel:  "system",
+			ChatID:   "telegram:-1001234567890",
+			ChatType: "direct",
+			TopicID:  "42",
+			SenderID: "async:spawn",
+			Raw: map[string]string{
+				systemFollowUpOriginChannelKey:  "telegram",
+				systemFollowUpOriginChatIDKey:   "-1001234567890",
+				systemFollowUpOriginChatTypeKey: "group",
+				systemFollowUpOriginTopicIDKey:  "42",
+			},
+		},
+		Content: "Task 'deep-research' completed.\n\nResult:\nreport URL",
+	})
+
+	if _, err := al.processSystemMessage(context.Background(), msg); err != nil {
+		t.Fatalf("processSystemMessage() error = %v", err)
+	}
+
+	select {
+	case outbound := <-msgBus.OutboundChan():
+		if outbound.Content != "follow-up response" {
+			t.Fatalf("outbound content = %q, want follow-up response", outbound.Content)
+		}
+		if outbound.Channel != "telegram" || outbound.ChatID != "-1001234567890" {
+			t.Fatalf("outbound route = %s/%s, want telegram/-1001234567890", outbound.Channel, outbound.ChatID)
+		}
+		if outbound.Context.ChatType != "group" {
+			t.Fatalf("outbound chat type = %q, want group; context=%+v", outbound.Context.ChatType, outbound.Context)
+		}
+		if outbound.Context.TopicID != "42" {
+			t.Fatalf("outbound topic = %q, want 42; context=%+v", outbound.Context.TopicID, outbound.Context)
+		}
+	case <-time.After(responseTimeout):
+		t.Fatal("timed out waiting for outbound response")
+	}
+}
+
 func TestProcessMessage_CommandOutcomes(t *testing.T) {
 	tmpDir, err := os.MkdirTemp("", "agent-test-*")
 	if err != nil {
diff --git a/pkg/agent/pipeline_execute.go b/pkg/agent/pipeline_execute.go
index 0f71c7432..d792c5ab2 100644
--- a/pkg/agent/pipeline_execute.go
+++ b/pkg/agent/pipeline_execute.go
@@ -417,6 +417,8 @@ toolLoop:
 					ChatID:   fmt.Sprintf("%s:%s", ts.channel, ts.chatID),
 					ChatType: "direct",
 					SenderID: fmt.Sprintf("async:%s", asyncToolName),
+					TopicID:  originTopicID(ts.opts.Dispatch.InboundContext),
+					Raw:      systemFollowUpOriginRaw(ts.opts.Dispatch.InboundContext, ts.channel, ts.chatID),
 				},
 				Content: content,
 			})