Restore generic agent mode messaging

app/(chat)/api/chat/route.ts

@@ -4161,16 +4161,6 @@ export async function POST(request: Request) {
       .trim();
     const autoContextText = typeof autoContext === "string" ? autoContext.trim() : "";
 
-    if (composerMode === "agent" && !agentPresetId) {
-      return NextResponse.json(
-        {
-          code: "bad_request:api",
-          message: "智能体模式缺少生图模式配置，请刷新页面后重新选择生图模式再试",
-        },
-        { status: 400 },
-      );
-    }
-
     const now = Date.now();
     for (const [key, startedAt] of inFlightChatRequests.entries()) {
       if (now - startedAt > IN_FLIGHT_REQUEST_TTL_MS) {

components/canvas/CanvasChatPanel.tsx

@@ -7630,13 +7630,6 @@ export function CanvasChatPanel({
       textContent = `请基于当前工作流设定生成方案：${workflowContext.summaryText}`;
     }
     const effectiveComposerMode = activeComposerModeRef.current || activeComposerMode;
-    if (effectiveComposerMode === "agent" && !selectedAgentPresetId) {
-      toast.error("智能体模式缺少生图模式配置，请先选择智能体后再发送");
-      activeComposerModeRef.current = computedComposerMode;
-      setComposerModeOverride(null);
-      return;
-    }
-
     if (!textContent && hasAgentUploadSlots && selectedAgentPreset) {
       textContent = `请按「${selectedAgentPreset.name}」智能体配置顺序处理产品图1、产品图2和模特图。`;
     }
@@ -8392,13 +8385,15 @@ export function CanvasChatPanel({
     renderableVisibleMessages.length === 0 &&
     !isLoading &&
     !shouldShowImageLoading;
-  const workspaceEmptyTitle = !selectedAgentPresetId
-    ? "请先在左侧选择智能体"
+  const workspaceEmptyTitle =
+    activeComposerMode === "agent" && !selectedAgentPresetId
+    ? "直接输入需求开始对话"
     : hasAgentUploadSlots && attachments.length < agentRequiredUploadCount
       ? `请先补齐图片槽位（${attachments.length}/${agentRequiredUploadCount}）`
       : "准备开始生成";
-  const workspaceEmptyDescription = !selectedAgentPresetId
-    ? "切换到 Agent 模式后，请先选择智能体，随后这里会显示生成结果。"
+  const workspaceEmptyDescription =
+    activeComposerMode === "agent" && !selectedAgentPresetId
+    ? "可直接上传图片或输入需求；如需套用预设，再选择智能体即可。"
     : hasAgentUploadSlots && attachments.length < agentRequiredUploadCount
       ? "从左侧 SKU / SPU 获取图片，或在下方继续上传替换后，再点击开始生成。"
       : "可在下方补充要求后点击开始生成，结果会显示在这里。";