diff --git a/frontend-web/src/core/auth/task-deeplink.ts b/frontend-web/src/core/auth/task-deeplink.ts
index 673073d5..6b51a73a 100644
--- a/frontend-web/src/core/auth/task-deeplink.ts
+++ b/frontend-web/src/core/auth/task-deeplink.ts
@@ -234,7 +234,7 @@ export interface TaskDeeplinkTarget {
 }
 
 /** xdfx（行动分析）开场信息里要追加的行动信息：行动标题 + 行动内容 + 行动id。 */
-interface ActionOpeningInfo {
+export interface ActionOpeningInfo {
   /** 行动id（action_id）。 */
   actionId?: string;
   /** 行动标题（行动名称 actionName）。 */
@@ -264,8 +264,12 @@ function buildOpeningText(detail: CopTaskDetail, taskId: string, action?: Action
  * 3qfx/rwfx 这类“按任务id 直接问答”的任务工作区，在 ``TaskContext`` 丢失但
  * ``login.copTaskDetail`` 仍存在时，可用它重新拼出开场词做前端自恢复。
  */
-export function buildTaskOpeningText(detail: CopTaskDetail, taskId: string): string {
-  return buildOpeningText(detail, taskId);
+export function buildTaskOpeningText(
+  detail: CopTaskDetail,
+  taskId: string,
+  action?: ActionOpeningInfo,
+): string {
+  return buildOpeningText(detail, taskId, action);
 }
 
 /**
diff --git a/frontend-web/src/pages/AgentChatPage.tsx b/frontend-web/src/pages/AgentChatPage.tsx
index 9bbb23cb..ddb3deaa 100644
--- a/frontend-web/src/pages/AgentChatPage.tsx
+++ b/frontend-web/src/pages/AgentChatPage.tsx
@@ -50,10 +50,18 @@ import {
   type TemplateRenderResult,
 } from "@/core/scheduled-tasks";
 import { env } from "@/env";
-import { readTaskContext, taskThreadMetadata } from "@/core/auth/task-purpose";
+import {
+  readTaskContext,
+  taskThreadMetadata,
+  type TaskContext,
+} from "@/core/auth/task-purpose";
 import { TaskPurposePanel } from "@/strategy-components/components/task-components/TaskPurposePanel";
 import { desensitize } from "@/lib/desensitize";
-import { buildTaskOpeningText, readCopTaskDetail } from "@/core/auth/task-deeplink";
+import {
+  buildTaskOpeningText,
+  readActionDetail,
+  readCopTaskDetail,
+} from "@/core/auth/task-deeplink";
 
 /** 内置「模板数据转换器」agent 的稳定 id。仅此 agent 的对话页显示「页面模板 + 渲染预览」调试入口。 */
 const TEMPLATE_BUILDER_AGENT_ID = "template-json-builder";
@@ -104,7 +112,8 @@ export default function AgentChatPage({
 
   // 任务深链上下文（taskId + 开场信息）：闸门(rwfx)与纯绑定(3qfx/xdfx)都要读取。
   const taskCtxOn = !!(taskGate || taskBind);
-  const taskContext = useMemo(() => {
+  const isXdfxTaskBind = !!chatBasePath?.includes("/plan-task-action/");
+  const taskContext = useMemo<TaskContext | null>(() => {
     if (!taskCtxOn) return null;
     const stored = readTaskContext();
     if (stored && stored.agentId === agent_id) return stored;
@@ -114,15 +123,28 @@ export default function AgentChatPage({
       const detail = readCopTaskDetail();
       const fallbackTaskId = detail?.id == null ? "" : String(detail.id).trim();
       if (detail && fallbackTaskId && agent_id) {
+        const actionDetail = isXdfxTaskBind ? readActionDetail() : null;
+        const actionId = actionDetail?.id ? String(actionDetail.id).trim() : "";
+        const actionTaskId = actionDetail?.taskId ? String(actionDetail.taskId).trim() : "";
+        const hasMatchingAction =
+          !!actionId && !!actionTaskId && actionTaskId === fallbackTaskId;
+        const actionInfo = hasMatchingAction
+          ? {
+              actionId,
+              actionName: actionDetail?.actionName,
+              narration: actionDetail?.narration,
+            }
+          : undefined;
         return {
           taskId: fallbackTaskId,
           agentId: agent_id,
-          openingText: buildTaskOpeningText(detail, fallbackTaskId),
+          openingText: buildTaskOpeningText(detail, fallbackTaskId, actionInfo),
+          ...(hasMatchingAction ? { actionId, partitionByAction: true } : {}),
         };
       }
     }
     return stored;
-  }, [agent_id, taskBind, taskCtxOn, taskGate]);
+  }, [agent_id, isXdfxTaskBind, taskBind, taskCtxOn, taskGate]);
   const taskId =
     taskCtxOn && taskContext && taskContext.agentId === agent_id
       ? taskContext.taskId
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 dfa1b7c2..650828f1 100644
--- a/frontend-web/src/strategy-components/components/task-components/TaskFxWorkspace.tsx
+++ b/frontend-web/src/strategy-components/components/task-components/TaskFxWorkspace.tsx
@@ -37,6 +37,7 @@ import {
 } from "@/core/auth/task-purpose";
 import {
   fetchActionDetail,
+  readActionDetail,
   readCopTaskDetail,
   type ActionDetail,
 } from "@/core/auth/task-deeplink";
@@ -61,12 +62,22 @@ function useChatsBase(taskBase: string): {
   const agentId = agent_id ?? "";
   const ctx = readTaskContext();
   const detail = readCopTaskDetail();
+  const isXdfx = taskBase.includes("/plan-task-action");
+  const cachedAction = isXdfx ? readActionDetail() : null;
   const fallbackTaskId =
     detail?.id == null ? "" : String(detail.id).trim();
+  const fallbackActionId = cachedAction?.id ? String(cachedAction.id).trim() : "";
+  const fallbackActionTaskId = cachedAction?.taskId ? String(cachedAction.taskId).trim() : "";
+  const hasMatchingAction =
+    !!fallbackActionId && !!fallbackActionTaskId && fallbackActionTaskId === fallbackTaskId;
   // 3qfx 偶发会出现 task context 丢失，但任务详情仍在 sessionStorage 的情况。
   // 这里回退到任务详情里的 taskId，避免左侧对话列表直接失效成“空任务态”。
-  const taskId = ctx?.taskId ?? fallbackTaskId;
-  const actionId = ctx?.partitionByAction ? (ctx.actionId ?? "") : "";
+  const taskId = ctx?.taskId ?? (hasMatchingAction ? fallbackActionTaskId : fallbackTaskId);
+  const actionId = ctx?.partitionByAction
+    ? (ctx.actionId ?? "")
+    : hasMatchingAction
+      ? fallbackActionId
+      : "";
   return { taskId, agentId, actionId, chatsBase: `${taskBase}/agent/${agentId}/chats` };
 }