diff --git a/frontend-web/src/core/threads/hooks.ts b/frontend-web/src/core/threads/hooks.ts
index 6d34117b..a84e1c32 100644
--- a/frontend-web/src/core/threads/hooks.ts
+++ b/frontend-web/src/core/threads/hooks.ts
@@ -785,7 +785,10 @@ export function useThreadStream({
         } as typeof thread)
       : thread;
 
-  return [mergedThread, sendMessage, isUploading] as const;
+  // 第 4 个返回值 `onStreamThreadId` = 底层 useStream 当前实际绑定的线程 id（新建/未保存时为 null）。
+  // 调用方据此判断「流是否已切到全新线程」，避免在切换会话的那一帧把消息发进上一个会话
+  // （submit 的 threadId 选项仅在 hook 线程为 null/undefined 时才生效）。
+  return [mergedThread, sendMessage, isUploading, onStreamThreadId] as const;
 }
 
 export function useThreads(
diff --git a/frontend-web/src/lib/desensitize.ts b/frontend-web/src/lib/desensitize.ts
index 38546f01..5440451d 100644
--- a/frontend-web/src/lib/desensitize.ts
+++ b/frontend-web/src/lib/desensitize.ts
@@ -11,6 +11,10 @@
  * {@link DESENSITIZE_MAP}。
  */
 export const SEED_DESENSITIZE_MAP: Readonly<Record<string, string>> = Object.freeze({
+  // 任务工作区业务名 → 业务码（脱敏展示）。整词在前，优先于下面更短的「任务」「行动」匹配。
+  任务分析: "rwfx",
+  三情分析: "3qfx",
+  行动分析: "xdfx",
   方案: "FA",
   设计: "SJ",
   任务: "RW", 
diff --git a/frontend-web/src/pages/AgentChatPage.tsx b/frontend-web/src/pages/AgentChatPage.tsx
index 12c09a2b..19008977 100644
--- a/frontend-web/src/pages/AgentChatPage.tsx
+++ b/frontend-web/src/pages/AgentChatPage.tsx
@@ -130,7 +130,7 @@ export default function AgentChatPage({
   }, [isNewThread, threadId, agent_id]);
 
   const { showNotification } = useNotification();
-  const [thread, sendMessage] = useThreadStream({
+  const [thread, sendMessage, , streamThreadId] = useThreadStream({
     threadId: isNewThread ? undefined : threadId,
     assistantId: agent_id,
     context: { ...settings.context, agent_id },
@@ -229,13 +229,19 @@ export default function AgentChatPage({
 
   // 纯绑定任务深链（3qfx/xdfx，无闸门）：进入新建对话即自动发出任务开场信息。
   // 每次新建对话都带（与 rwfx 闸门「开始问答」发出等价）；ref 防止同一会话内重复发出。
+  //
+  // 必须等 `streamThreadId == null`（底层 stream 已切到全新线程）才发：从已有会话点「新建对话」时，
+  // `isNewThread` 先翻 true，但 useThreadStream 的 onStreamThreadId 要慢一帧才重置为 null。
+  // 若在那一帧就 submit，hook 仍绑定上一个会话，submit 的 threadId 选项被忽略 → 开场信息发进
+  // 上一个对话（表现为「一直在同一个聊天框里发消息」）。等它归零再发即落到新建线程。
   useEffect(() => {
     if (!taskAutoSendText) return;
     if (!isNewThread) return;
+    if (streamThreadId != null) return;
     if (taskAutoSentRef.current) return;
     taskAutoSentRef.current = true;
     handleSubmit({ text: taskAutoSendText, files: [] });
-  }, [taskAutoSendText, isNewThread, handleSubmit]);
+  }, [taskAutoSendText, isNewThread, streamThreadId, handleSubmit]);
 
   const handleClarificationSubmit = useCallback(
     (answer: string) => {
diff --git a/frontend-web/src/strategy-components/components/task-components/TaskFxWorkspace.tsx b/frontend-web/src/strategy-components/components/task-components/TaskFxWorkspace.tsx
index ace8bd25..91a337f0 100644
--- a/frontend-web/src/strategy-components/components/task-components/TaskFxWorkspace.tsx
+++ b/frontend-web/src/strategy-components/components/task-components/TaskFxWorkspace.tsx
@@ -148,9 +148,9 @@ function TaskJumpBar({ business, taskId }: { business: TaskBusiness; taskId: str
           key={btn.id}
           className="h-11 gap-2 border-transparent bg-[var(--color-main)] px-6 text-base text-white shadow-sm hover:bg-[var(--brand-950)]"
           onClick={() => handleRun(btn)}
-          title={btn.label}
+          title={desensitize(btn.label)}
         >
-          <span className="truncate">{btn.label}</span>
+          <span className="truncate">{desensitize(btn.label)}</span>
           {btn.linkType === "url" ? (
             <ExternalLink className="h-5 w-5 shrink-0" />
           ) : btn.linkType === "purpose" ? (
@@ -191,7 +191,7 @@ function TaskConversationsList({
   const navigate = useNavigate();
   const { threads, isLoading } = useTaskThreads(taskId, agentId);
   const currentThreadId = useMemo(() => parseThreadId(pathname, chatsBase), [pathname, chatsBase]);
-  const businessName = TASK_BUSINESSES.find((b) => b.code === business)?.name ?? "";
+  const businessName = desensitize(TASK_BUSINESSES.find((b) => b.code === business)?.name ?? "");
 
   return (
     <div className="bg-background/85 border-border/70 flex w-64 shrink-0 flex-col border-r shadow-[12px_0_30px_-30px_rgba(15,23,42,0.45)] backdrop-blur-xl dark:border-[#1b477e]/70 dark:bg-[#061b35]/82">
diff --git a/frontend-web/src/strategy-components/components/task-components/TaskPurposePanel.tsx b/frontend-web/src/strategy-components/components/task-components/TaskPurposePanel.tsx
index 56bc1f1c..e1b052b5 100644
--- a/frontend-web/src/strategy-components/components/task-components/TaskPurposePanel.tsx
+++ b/frontend-web/src/strategy-components/components/task-components/TaskPurposePanel.tsx
@@ -31,6 +31,7 @@ import {
   type TaskPurposeResult,
 } from "@/core/auth/task-purpose";
 import { fetchTaskIdFromAction } from "@/core/auth/task-deeplink";
+import { desensitize } from "@/lib/desensitize";
 import { cn } from "@/lib/utils";
 
 /** 目的树表格：拍平成行，列数随数据自适应；层级缺失补空、字段变动不崩。 */
@@ -58,7 +59,7 @@ export function PurposeTable({ tree, className }: { tree: PurposeTreeNode[]; cla
                 key={i}
                 className="bg-muted/60 border-border/60 sticky top-0 border px-3 py-1.5 text-left font-medium whitespace-nowrap"
               >
-                {h}
+                {desensitize(h)}
               </th>
             ))}
           </tr>
@@ -72,9 +73,9 @@ export function PurposeTable({ tree, className }: { tree: PurposeTreeNode[]; cla
                   <td key={ci} className="border-border/60 border px-3 py-1.5">
                     {cell ? (
                       <>
-                        <span>{cell.text || "（空）"}</span>
+                        <span>{cell.text ? desensitize(cell.text) : "（空）"}</span>
                         {cell.reason ? (
-                          <span className="text-muted-foreground block text-xs">理由：{cell.reason}</span>
+                          <span className="text-muted-foreground block text-xs">理由：{desensitize(cell.reason)}</span>
                         ) : null}
                       </>
                     ) : (