diff --git a/app/(chat)/api/chat/route.ts b/app/(chat)/api/chat/route.ts
index 34a6b2909..cddfa35d3 100644
--- a/app/(chat)/api/chat/route.ts
+++ b/app/(chat)/api/chat/route.ts
@@ -3042,6 +3042,7 @@ export async function POST(request: Request) {
       agentPresetId,
       selectedChatModel,
       selectedVisibilityType,
+      composerMode,
       hiddenPrompt,
       autoContext,
       contextPayload,
@@ -3054,6 +3055,7 @@ export async function POST(request: Request) {
       agentPresetId?: string;
       selectedChatModel: ChatModel["id"];
       selectedVisibilityType: VisibilityType;
+      composerMode?: "agent" | "image" | "video" | "detail";
       hiddenPrompt?: string;
       autoContext?: string;
       contextPayload?: PostRequestBody["contextPayload"];
@@ -3137,8 +3139,16 @@ export async function POST(request: Request) {
       | null = null;
     let shouldAskGridConfirmation = false;
     const deepThinkingOn = deepThinkingEnabled !== false;
+    const shouldRespectDirectComposerMode =
+      composerMode === "image" || composerMode === "video" || composerMode === "detail";
     let shouldRunAgentConversation = finalModelId === "auto";
     let shouldKeepSelectedModel = false;
+    if (shouldRespectDirectComposerMode && shouldRunAgentConversation) {
+      shouldRunAgentConversation = false;
+      console.log(
+        `[Smart Auto Mode] ⛳ Direct composer mode (${composerMode}) disables initial auto-agent routing`,
+      );
+    }
     const pendingProtocolDebugEvents: Array<{ phase: string; payload: Record<string, unknown> }> = [];
     const requestedModelId = selectedChatModel;
     let requestedModelProviderType: string | undefined;
@@ -3203,20 +3213,32 @@ export async function POST(request: Request) {
 
         if (deepThinkingOn) {
           if (isAiModelAgentAuto(selectedModelConfig)) {
-            shouldRunAgentConversation = true;
-            shouldKeepSelectedModel = false;
-            preferredAgentModelId = selectedModelConfig.id;
-            configuredAgentConversationModelId = selectedModelConfig.id;
-            console.log(
-              `[Smart Auto Mode] 🧠 Agent-only model detected, force auto routing: ${selectedModelConfig.displayName}`
-            );
+            if (shouldRespectDirectComposerMode) {
+              console.log(
+                `[Smart Auto Mode] ⛳ Respect direct composer mode (${composerMode}), skip forcing agent-only routing for: ${selectedModelConfig.displayName}`,
+              );
+            } else {
+              shouldRunAgentConversation = true;
+              shouldKeepSelectedModel = false;
+              preferredAgentModelId = selectedModelConfig.id;
+              configuredAgentConversationModelId = selectedModelConfig.id;
+              console.log(
+                `[Smart Auto Mode] 🧠 Agent-only model detected, force auto routing: ${selectedModelConfig.displayName}`
+              );
+            }
           } else if (isFixedVisualModel || isConversationMultimodalModel) {
-            shouldRunAgentConversation = true;
-            shouldKeepSelectedModel = true;
-            preferredAgentModelId = selectedModelConfig.id;
-            console.log(
-              `[Smart Auto Mode] 🎯 Agent conversation enabled for selected model: ${selectedModelConfig.displayName} (${selectedModelProviderType || "unknown"}), preferredAgentModelId=${preferredAgentModelId}`
-            );
+            if (shouldRespectDirectComposerMode) {
+              console.log(
+                `[Smart Auto Mode] ⛳ Respect direct composer mode (${composerMode}), keep direct execution model: ${selectedModelConfig.displayName}`,
+              );
+            } else {
+              shouldRunAgentConversation = true;
+              shouldKeepSelectedModel = true;
+              preferredAgentModelId = selectedModelConfig.id;
+              console.log(
+                `[Smart Auto Mode] 🎯 Agent conversation enabled for selected model: ${selectedModelConfig.displayName} (${selectedModelProviderType || "unknown"}), preferredAgentModelId=${preferredAgentModelId}`
+              );
+            }
           }
         } else if (
           isFixedVisualModel ||
@@ -3397,11 +3419,17 @@ export async function POST(request: Request) {
         const effectiveWorkingState = prunedTaskBoundaryContext.workingState;
 
     if (taskBoundaryRequiresAgentConversation && !shouldRunAgentConversation) {
-      shouldRunAgentConversation = true;
-      shouldKeepSelectedModel = false;
-      console.log(
-        `[Smart Auto Mode] 🧭 Force agent conversation due to task boundary: ${taskBoundaryDecision.taskType}/${taskBoundaryDecision.taskMode}`,
-      );
+      if (shouldRespectDirectComposerMode) {
+        console.log(
+          `[Smart Auto Mode] ⛳ Respect direct composer mode (${composerMode}), skip task-boundary agent force: ${taskBoundaryDecision.taskType}/${taskBoundaryDecision.taskMode}`,
+        );
+      } else {
+        shouldRunAgentConversation = true;
+        shouldKeepSelectedModel = false;
+        console.log(
+          `[Smart Auto Mode] 🧭 Force agent conversation due to task boundary: ${taskBoundaryDecision.taskType}/${taskBoundaryDecision.taskMode}`,
+        );
+      }
     }
 
     if (taskBoundaryOverridesLegacyWorkflow && shouldKeepSelectedModel) {
@@ -3412,7 +3440,11 @@ export async function POST(request: Request) {
     }
 
     if (resolvedConversationAction.forceAgentConversation && !shouldRunAgentConversation) {
-      if (taskBoundaryOverridesLegacyWorkflow) {
+      if (shouldRespectDirectComposerMode) {
+        console.log(
+          `[Smart Auto Mode] ⛳ Respect direct composer mode (${composerMode}), skip legacy workflow force: ${resolvedConversationAction.kind}`,
+        );
+      } else if (taskBoundaryOverridesLegacyWorkflow) {
         console.log(
           `[Smart Auto Mode] 🪫 Ignore legacy workflow follow-up due to task boundary override: ${resolvedConversationAction.kind} -> ${taskBoundaryDecision.taskType}`,
         );
diff --git a/app/(chat)/api/chat/schema.ts b/app/(chat)/api/chat/schema.ts
index 0be3a5e6a..25b5dca2e 100644
--- a/app/(chat)/api/chat/schema.ts
+++ b/app/(chat)/api/chat/schema.ts
@@ -103,6 +103,7 @@ export const postRequestBodySchema = z.object({
   // 支持预定义模型名称或数据库中的模型 UUID
   selectedChatModel: z.string().min(1).max(128),
   selectedVisibilityType: z.enum(["public", "private"]),
+  composerMode: z.enum(["agent", "image", "video", "detail"]).optional(),
   deepThinkingEnabled: z.boolean().optional(),
   debugProtocol: z.boolean().optional(),
   videoParams: videoParamsSchema, // 视频参数
diff --git a/components/canvas/CanvasChatPanel.tsx b/components/canvas/CanvasChatPanel.tsx
index 200455f2f..a29cafdda 100644
--- a/components/canvas/CanvasChatPanel.tsx
+++ b/components/canvas/CanvasChatPanel.tsx
@@ -2950,6 +2950,15 @@ export function CanvasChatPanel({
   const isAgentModel =
     !isDetailGenerationMode &&
     (!selectedModelId || selectedModelId === "auto" || isConversationModel);
+  const computedComposerMode = useMemo<"agent" | "image" | "video" | "detail">(() => {
+    if (isDetailGenerationMode) return "detail";
+    if (isVideoModel) return "video";
+    if (isAgentModel) return "agent";
+    return "image";
+  }, [isAgentModel, isDetailGenerationMode, isVideoModel]);
+  const [composerModeOverride, setComposerModeOverride] = useState<
+    "agent" | "image" | "video" | "detail" | null
+  >(null);
   const agentSelectableModels = useMemo(
     () => [SMART_AUTO_MODEL, ...conversationOnlyModels],
     [SMART_AUTO_MODEL, conversationOnlyModels]
@@ -2989,12 +2998,7 @@ export function CanvasChatPanel({
     if (videoParams.mode === "first-frame") return ["首帧"] as string[];
     return [] as string[];
   }, [isVideoModel, videoParams]);
-  const activeComposerMode = useMemo<"agent" | "image" | "video" | "detail">(() => {
-    if (isDetailGenerationMode) return "detail";
-    if (isVideoModel) return "video";
-    if (isAgentModel) return "agent";
-    return "image";
-  }, [isAgentModel, isDetailGenerationMode, isVideoModel]);
+  const activeComposerMode = composerModeOverride || computedComposerMode;
   const agentUploadSlots = useMemo(() => {
     if (
       activeComposerMode !== "agent" ||
@@ -3256,6 +3260,7 @@ export function CanvasChatPanel({
   }, [modelSelectValue, selectedModelId]);
 
   useEffect(() => {
+    if (activeComposerMode !== "agent") return;
     if (!selectedAgentPresetId) return;
     if (!selectedAgentPreset?.defaultModelId) return;
     if (currentModelIdRef.current === selectedAgentPreset.defaultModelId) return;
@@ -3266,6 +3271,7 @@ export function CanvasChatPanel({
       setIsDetailGenerationMode(false);
     }
   }, [
+    activeComposerMode,
     isDetailGenerationMode,
     selectedAgentPreset,
     selectedAgentPresetId,
@@ -3448,6 +3454,10 @@ export function CanvasChatPanel({
 
   const handleSelectGenerationMode = useCallback(
     (mode: "agent" | "image" | "video" | "detail") => {
+      hiddenPromptRef.current = null;
+      autoContextRef.current = null;
+      setComposerModeOverride(mode);
+
       if (mode === "agent") {
         const preferredAgentModelId =
           allModels.find(
@@ -3909,6 +3919,7 @@ export function CanvasChatPanel({
                 ? selectedAgentPreset.id
                 : undefined,
             selectedChatModel: currentModelIdRef.current,
+            composerMode: activeComposerMode,
             selectedVisibilityType: "private",
             deepThinkingEnabled: requestIsConversationModel
               ? false
@@ -7085,7 +7096,11 @@ export function CanvasChatPanel({
         `【工作流设定】\n${workflowContext.promptText}\n\n请严格遵循以上工作流设定输出内容，并保持整体结果一致。`
       );
     }
-    if (selectedAgentPreset?.type === "text" && selectedAgentPreset.slots?.length) {
+    if (
+      activeComposerMode === "agent" &&
+      selectedAgentPreset?.type === "text" &&
+      selectedAgentPreset.slots?.length
+    ) {
       const presetPrompt = selectedAgentPreset.slots
         .map((slot, index) => {
           const title = String(slot.title || slot.uploadLabel || `模板${index + 1}`).trim();