diff --git a/components/agents/AgentDetailReferenceStitchDialog.tsx b/components/agents/AgentDetailReferenceStitchDialog.tsx
index f17caa105..c33e35a24 100644
--- a/components/agents/AgentDetailReferenceStitchDialog.tsx
+++ b/components/agents/AgentDetailReferenceStitchDialog.tsx
@@ -358,6 +358,13 @@ export function AgentDetailReferenceStitchDialog({
     setCutLines(snapshot.defaultCutLines);
   }, [snapshot]);
 
+  const handleClearCutLines = useCallback(() => {
+    setCutLines([]);
+    setDraggingLineIndex(null);
+    setIsAddingCutLine(false);
+    setPreviewCutLineY(null);
+  }, []);
+
   const handleRemoveCutLine = useCallback((index: number) => {
     setCutLines((current) => current.filter((_, currentIndex) => currentIndex !== index));
   }, []);
@@ -549,6 +556,16 @@ export function AgentDetailReferenceStitchDialog({
                 <RotateCcw className="mr-2 h-4 w-4" />
                 恢复原页边界
               </Button>
+              <Button
+                type="button"
+                variant="outline"
+                onClick={handleClearCutLines}
+                disabled={!snapshot || isLoading || isApplying || normalizedCutLines.length === 0}
+                className="border-red-400/20 bg-red-500/[0.06] text-red-100 hover:bg-red-500/[0.14] hover:text-red-50"
+              >
+                <Trash2 className="mr-2 h-4 w-4" />
+                清空切线
+              </Button>
               <div className="text-xs text-white/42">
                 默认切线已按原始详情页边界生成，可直接拖动横线微调。
                 {isAddingCutLine ? " 当前已进入加线模式，移动鼠标预览位置后点击长图即可落线。" : ""}
diff --git a/components/agents/AgentGenerationWorkspace.tsx b/components/agents/AgentGenerationWorkspace.tsx
index a9cdd8091..c1544aa57 100644
--- a/components/agents/AgentGenerationWorkspace.tsx
+++ b/components/agents/AgentGenerationWorkspace.tsx
@@ -234,6 +234,24 @@ export function AgentGenerationWorkspace({
     () => selectableModels.find((model) => model.id === selectedModelId) || selectableModels[0],
     [selectableModels, selectedModelId]
   );
+  const transportStateRef = useRef<{
+    selectedAgentPresetId: string | null;
+    selectedModelId: string;
+    imageParams: ImageGenerationParams;
+  }>({
+    selectedAgentPresetId: null,
+    selectedModelId: "auto",
+    imageParams: {
+      aspectRatio: "auto",
+      imageSize: "2K",
+      imageCount: 1,
+    },
+  });
+  transportStateRef.current = {
+    selectedAgentPresetId: selectedAgentPresetId || null,
+    selectedModelId,
+    imageParams,
+  };
 
   const { messages, setMessages, sendMessage, status } = useChat<ChatMessage>({
     id: chatId,
@@ -244,15 +262,16 @@ export function AgentGenerationWorkspace({
       api: "/api/chat",
       fetch: fetchWithErrorHandlers,
       prepareSendMessagesRequest(request) {
+        const transportState = transportStateRef.current;
         return {
           body: {
             id: rawChatId,
             message: request.messages.at(-1),
             hiddenPrompt: hiddenPromptRef.current || undefined,
-            agentPresetId: selectedAgentPresetId || undefined,
-            selectedChatModel: selectedModelId,
+            agentPresetId: transportState.selectedAgentPresetId || undefined,
+            selectedChatModel: transportState.selectedModelId,
             selectedVisibilityType: "private",
-            imageParams,
+            imageParams: transportState.imageParams,
           },
         };
       },
diff --git a/components/agents/AgentGenerationWorkspaceDark.tsx b/components/agents/AgentGenerationWorkspaceDark.tsx
index 81addbbe9..f355c2cff 100644
--- a/components/agents/AgentGenerationWorkspaceDark.tsx
+++ b/components/agents/AgentGenerationWorkspaceDark.tsx
@@ -152,6 +152,24 @@ export function AgentGenerationWorkspaceDark({
     () => selectableModels.find((model) => model.id === selectedModelId) || selectableModels[0],
     [selectableModels, selectedModelId]
   );
+  const transportStateRef = useRef<{
+    selectedAgentPresetId: string | null;
+    selectedModelId: string;
+    imageParams: ImageGenerationParams;
+  }>({
+    selectedAgentPresetId: null,
+    selectedModelId: "auto",
+    imageParams: {
+      aspectRatio: "auto",
+      imageSize: "2K",
+      imageCount: 1,
+    },
+  });
+  transportStateRef.current = {
+    selectedAgentPresetId: selectedAgentPresetId || null,
+    selectedModelId,
+    imageParams,
+  };
 
   const { messages, setMessages, sendMessage, status } = useChat<ChatMessage>({
     id: chatId,
@@ -162,15 +180,16 @@ export function AgentGenerationWorkspaceDark({
       api: "/api/chat",
       fetch: fetchWithErrorHandlers,
       prepareSendMessagesRequest(request) {
+        const transportState = transportStateRef.current;
         return {
           body: {
             id: rawChatId,
             message: request.messages.at(-1),
             hiddenPrompt: hiddenPromptRef.current || undefined,
-            agentPresetId: selectedAgentPresetId || undefined,
-            selectedChatModel: selectedModelId,
+            agentPresetId: transportState.selectedAgentPresetId || undefined,
+            selectedChatModel: transportState.selectedModelId,
             selectedVisibilityType: "private",
-            imageParams,
+            imageParams: transportState.imageParams,
           },
         };
       },
diff --git a/components/agents/AgentGenerationWorkspaceDarkV2.tsx b/components/agents/AgentGenerationWorkspaceDarkV2.tsx
index 0651b3fa7..659d4b40d 100644
--- a/components/agents/AgentGenerationWorkspaceDarkV2.tsx
+++ b/components/agents/AgentGenerationWorkspaceDarkV2.tsx
@@ -759,6 +759,57 @@ export function AgentGenerationWorkspaceDarkV2({
   const skuReplacementCandidates = skuReplacementState.candidates;
   const skuReplacementSelectedCandidateId = skuReplacementState.selectedCandidateId;
   const skuReplacementReferenceCards = skuReplacementState.references;
+  const transportStateRef = useRef<{
+    selectedAgentPresetId: string | null;
+    selectedAgentPresetType: AgentPreset["type"] | null;
+    selectedModelId: string;
+    imageParams: ImageGenerationParams;
+    isDetailReplacementPreset: boolean;
+    isSkuReplacementPreset: boolean;
+    detailReplacementQueryInput: string;
+    detailReplacementSelectedCandidateId: string | null;
+    detailReplacementReferenceCards: typeof detailReplacementReferenceCards;
+    skuReplacementQueryInput: string;
+    skuReplacementQueryType: typeof skuReplacementQueryType;
+    skuReplacementSelectedCandidateId: string | null;
+    skuReplacementReferenceCards: typeof skuReplacementReferenceCards;
+    selectedProductAttachmentCount: number;
+  }>({
+    selectedAgentPresetId: null,
+    selectedAgentPresetType: null,
+    selectedModelId: "auto",
+    imageParams: {
+      aspectRatio: "auto",
+      imageSize: "2K",
+      imageCount: 1,
+    },
+    isDetailReplacementPreset: false,
+    isSkuReplacementPreset: false,
+    detailReplacementQueryInput: "",
+    detailReplacementSelectedCandidateId: null,
+    detailReplacementReferenceCards: [],
+    skuReplacementQueryInput: "",
+    skuReplacementQueryType: "sku",
+    skuReplacementSelectedCandidateId: null,
+    skuReplacementReferenceCards: [],
+    selectedProductAttachmentCount: 0,
+  });
+  transportStateRef.current = {
+    selectedAgentPresetId: selectedAgentPresetId || null,
+    selectedAgentPresetType: selectedAgentPreset?.type || null,
+    selectedModelId,
+    imageParams,
+    isDetailReplacementPreset,
+    isSkuReplacementPreset,
+    detailReplacementQueryInput,
+    detailReplacementSelectedCandidateId: detailReplacementSelectedCandidateId || null,
+    detailReplacementReferenceCards,
+    skuReplacementQueryInput,
+    skuReplacementQueryType,
+    skuReplacementSelectedCandidateId: skuReplacementSelectedCandidateId || null,
+    skuReplacementReferenceCards,
+    selectedProductAttachmentCount: selectedProductAttachments.length,
+  };
 
   const selectableModels = useMemo(() => {
     const imageModels = (modelsData?.models || []).filter(
@@ -791,26 +842,27 @@ export function AgentGenerationWorkspaceDarkV2({
       api: "/api/chat",
       fetch: fetchWithErrorHandlers,
       prepareSendMessagesRequest(request) {
+        const transportState = transportStateRef.current;
         const replacementModePayload =
-          selectedAgentPreset?.type === "image" &&
-          (isDetailReplacementPreset || isSkuReplacementPreset)
+          transportState.selectedAgentPresetType === "image" &&
+          (transportState.isDetailReplacementPreset || transportState.isSkuReplacementPreset)
             ? {
-                modeType: isDetailReplacementPreset
+                modeType: transportState.isDetailReplacementPreset
                   ? ("detail_replacement" as const)
                   : ("sku_replacement" as const),
-                query: isDetailReplacementPreset
-                  ? detailReplacementQueryInput.trim()
-                  : skuReplacementQueryInput.trim(),
-                queryType: isDetailReplacementPreset
+                query: transportState.isDetailReplacementPreset
+                  ? transportState.detailReplacementQueryInput.trim()
+                  : transportState.skuReplacementQueryInput.trim(),
+                queryType: transportState.isDetailReplacementPreset
                   ? ("spu" as const)
-                  : skuReplacementQueryType,
-                selectedCandidateId: isDetailReplacementPreset
-                  ? detailReplacementSelectedCandidateId || null
-                  : skuReplacementSelectedCandidateId || null,
+                  : transportState.skuReplacementQueryType,
+                selectedCandidateId: transportState.isDetailReplacementPreset
+                  ? transportState.detailReplacementSelectedCandidateId || null
+                  : transportState.skuReplacementSelectedCandidateId || null,
                 references: (
-                  isDetailReplacementPreset
-                    ? detailReplacementReferenceCards
-                    : skuReplacementReferenceCards
+                  transportState.isDetailReplacementPreset
+                    ? transportState.detailReplacementReferenceCards
+                    : transportState.skuReplacementReferenceCards
                 )
                   .filter((item) => Boolean(String(item.imageUrl || "").trim()))
                   .map((item) => ({
@@ -820,10 +872,10 @@ export function AgentGenerationWorkspaceDarkV2({
                     candidateId: item.candidateId || null,
                     sortOrder: item.sortOrder ?? 0,
                     assignedProductIndex:
-                      selectedProductAttachments.length > 0
+                      transportState.selectedProductAttachmentCount > 0
                         ? Math.min(
                             item.assignedProductIndex ?? 0,
-                            Math.max(selectedProductAttachments.length - 1, 0)
+                            Math.max(transportState.selectedProductAttachmentCount - 1, 0)
                           )
                         : null,
                   })),
@@ -834,10 +886,10 @@ export function AgentGenerationWorkspaceDarkV2({
             id: rawChatId,
             message: request.messages.at(-1),
             hiddenPrompt: hiddenPromptRef.current || undefined,
-            agentPresetId: selectedAgentPresetId || undefined,
-            selectedChatModel: selectedModelId,
+            agentPresetId: transportState.selectedAgentPresetId || undefined,
+            selectedChatModel: transportState.selectedModelId,
             selectedVisibilityType: "private",
-            imageParams,
+            imageParams: transportState.imageParams,
             agentModePayload: replacementModePayload,
           },
         };
diff --git a/components/agents/AgentGenerationWorkspaceNew.tsx b/components/agents/AgentGenerationWorkspaceNew.tsx
index d5c591a76..34d5e1dee 100644
--- a/components/agents/AgentGenerationWorkspaceNew.tsx
+++ b/components/agents/AgentGenerationWorkspaceNew.tsx
@@ -329,6 +329,24 @@ export function AgentGenerationWorkspaceNew({
     () => selectableModels.find((model) => model.id === selectedModelId) || selectableModels[0],
     [selectableModels, selectedModelId]
   );
+  const transportStateRef = useRef<{
+    selectedAgentPresetId: string | null;
+    selectedModelId: string;
+    imageParams: ImageGenerationParams;
+  }>({
+    selectedAgentPresetId: null,
+    selectedModelId: "auto",
+    imageParams: {
+      aspectRatio: "auto",
+      imageSize: "2K",
+      imageCount: 1,
+    },
+  });
+  transportStateRef.current = {
+    selectedAgentPresetId: selectedAgentPresetId || null,
+    selectedModelId,
+    imageParams,
+  };
 
   const { messages, setMessages, sendMessage, status } = useChat<ChatMessage>({
     id: chatId,
@@ -339,15 +357,16 @@ export function AgentGenerationWorkspaceNew({
       api: "/api/chat",
       fetch: fetchWithErrorHandlers,
       prepareSendMessagesRequest(request) {
+        const transportState = transportStateRef.current;
         return {
           body: {
             id: rawChatId,
             message: request.messages.at(-1),
             hiddenPrompt: hiddenPromptRef.current || undefined,
-            agentPresetId: selectedAgentPresetId || undefined,
-            selectedChatModel: selectedModelId,
+            agentPresetId: transportState.selectedAgentPresetId || undefined,
+            selectedChatModel: transportState.selectedModelId,
             selectedVisibilityType: "private",
-            imageParams,
+            imageParams: transportState.imageParams,
           },
         };
       },