diff --git a/web/hwlab-cloud-web/scripts/workbench-e2e-server.ts b/web/hwlab-cloud-web/scripts/workbench-e2e-server.ts
index edcfc4bd..1e46d241 100644
--- a/web/hwlab-cloud-web/scripts/workbench-e2e-server.ts
+++ b/web/hwlab-cloud-web/scripts/workbench-e2e-server.ts
@@ -279,6 +279,7 @@ function createScenarioState(scenarioId: string): ScenarioState {
     traces.trc_terminal_empty = terminalEmptyTrace();
   }
   if (id === "progress-only-final-response") markRunningProgressOnly(sessions, traces);
+  if (id === "terminal-completed-no-final-response") markRunningNoFinalResponse(sessions, traces);
   if (id === "scroll-follow-long-trace") {
     const session = scrollFollowSession();
     sessions.unshift(session);
@@ -301,7 +302,7 @@ function createScenarioState(scenarioId: string): ScenarioState {
       ? "ses_completed"
       : id === "terminal-empty-trace"
         ? "ses_terminal_empty"
-        : id === "progress-only-final-response"
+        : id === "progress-only-final-response" || id === "terminal-completed-no-final-response"
           ? "ses_running"
         : base.selectedSessionId;
   const staleTraceId = id === "stale-nested-trace" || id === "stale-submit-restore" ? "trc_stale_502" : null;
@@ -318,7 +319,7 @@ function createScenarioState(scenarioId: string): ScenarioState {
     sessionDelayMs: id === "loading" ? 2_500 : 0,
     sessionDetailDelayMs: id === "legacy-cnv-deeplink-canonical" ? 1_500 : id === "session-switch-delayed-detail-frame" ? 900 : 0,
     chatDelayMs: id === "submit-authority-race" ? 1_000 : 0,
-    terminalScript: id === "event-replay" || id === "running-to-terminal" || id === "stale-submit-restore" || id === "progress-only-final-response",
+    terminalScript: id === "event-replay" || id === "running-to-terminal" || id === "stale-submit-restore" || id === "progress-only-final-response" || id === "terminal-completed-no-final-response",
     terminalFailureScript: id === "stale-submit-restore",
     staleTraceId,
     liveBackfillTraceId: null,
@@ -354,6 +355,45 @@ function markRunningProgressOnly(sessions: SessionRecord[], traces: Record<strin
   });
 }
 
+function markRunningNoFinalResponse(sessions: SessionRecord[], traces: Record<string, JsonRecord>): void {
+  const trace = noFinalRunningTrace();
+  traces.trc_running = trace;
+  const session = sessions.find((item) => item.sessionId === "ses_running");
+  if (!session) return;
+  session.status = "running";
+  session.lastTraceId = "trc_running";
+  session.firstUserMessagePreview = "completed turn without final response";
+  session.messages = (session.messages ?? []).map((message) => {
+    if (message.role === "user") return { ...message, text: "completed turn without final response" };
+    if (message.role !== "agent" || message.traceId !== "trc_running") return message;
+    return { ...message, text: "", status: "running", runnerTrace: trace };
+  });
+}
+
+function noFinalRunningTrace(): JsonRecord {
+  const createdAt = new Date().toISOString();
+  return {
+    traceId: "trc_running",
+    status: "running",
+    sessionId: "ses_running",
+    threadId: "thr_running",
+    turnId: "turn_running",
+    events: [{ seq: 1, createdAt, label: "agentrun:backend:turn/running", type: "backend_status", status: "running" }],
+    eventCount: 1,
+    fullTraceLoaded: false,
+    hasMore: false
+  };
+}
+
+function completedNoFinalTrace(): JsonRecord {
+  const createdAt = new Date().toISOString();
+  const events = [
+    { seq: 1, createdAt, label: "agentrun:backend:turn/running", type: "backend_status", status: "running" },
+    { seq: 2, createdAt, label: "agentrun:backend:turn/completed", type: "backend_status", status: "completed", terminal: true }
+  ];
+  return { traceId: "trc_running", status: "completed", sessionId: "ses_running", threadId: "thr_running", turnId: "turn_running", events, eventCount: events.length, fullTraceLoaded: true, hasMore: false };
+}
+
 function scrollFollowSession(): SessionRecord {
   const now = new Date().toISOString();
   const trace = scrollFollowTrace(90);
@@ -865,6 +905,14 @@ function sse(request: IncomingMessage, response: ServerResponse, url: URL): void
   const scenarioId = state.scenarioId;
   setTimeout(() => {
     if (state.scenarioId !== scenarioId) return;
+    if (state.scenarioId === "terminal-completed-no-final-response") {
+      const trace = completedNoFinalTrace();
+      const event = (trace.events as JsonRecord[]).at(-1) ?? { status: "completed", terminal: true };
+      writeSse(response, "workbench.trace.event", { type: "trace.event", sessionId: "ses_running", threadId: "thr_running", traceId: "trc_running", event, snapshot: trace });
+      finishRunningNoFinalResponse(trace);
+      writeSse(response, "workbench.turn.snapshot", { type: "turn.snapshot", sessionId: "ses_running", threadId: "thr_running", traceId: "trc_running", turn: turnPayload("trc_running") });
+      return;
+    }
     const terminalStatus = state.terminalFailureScript ? "failed" : "completed";
     const terminalText = state.terminalFailureScript ? "恢复后失败：缺少受控依赖。" : state.scenarioId === "progress-only-final-response" ? finalOnlyText : "事件重放后完成。";
     const event = { seq: 3, createdAt: new Date().toISOString(), label: "agentrun:assistant:message", type: "assistant_message", status: terminalStatus, replyAuthority: true, final: true, message: terminalText, terminal: true };
@@ -895,6 +943,15 @@ function finishRunningSession(status: "completed" | "failed", text: string): voi
   session.messages = (session.messages ?? []).map((message) => message.role === "agent" ? { ...message, text, status, runnerTrace: state.traces.trc_running } : message);
 }
 
+function finishRunningNoFinalResponse(trace: JsonRecord = completedNoFinalTrace()): void {
+  state.traces.trc_running = trace;
+  const session = sessionById("ses_running");
+  if (!session) return;
+  session.status = "completed";
+  session.updatedAt = new Date().toISOString();
+  session.messages = (session.messages ?? []).map((message) => message.role === "agent" ? { ...message, text: "", status: "completed", runnerTrace: trace } : message);
+}
+
 function stateSummary(): JsonRecord {
   return { scenarioId: state.scenarioId, selectedSessionId: state.selectedSessionId, requestLedger: state.requestLedger, legacyRequestLedger: state.legacyRequestLedger, chatRequests: state.chatRequests, staleTraceId: state.staleTraceId, sessions: state.sessions.map((item) => ({ sessionId: item.sessionId, threadId: item.threadId, status: item.status, lastTraceId: item.lastTraceId, hidden: item.hidden === true })) };
 }
diff --git a/web/hwlab-cloud-web/src/stores/workbench.ts b/web/hwlab-cloud-web/src/stores/workbench.ts
index 1ba235f7..f3b2b130 100644
--- a/web/hwlab-cloud-web/src/stores/workbench.ts
+++ b/web/hwlab-cloud-web/src/stores/workbench.ts
@@ -369,7 +369,16 @@ export const useWorkbenchStore = defineStore("workbench", () => {
       const replyText = agentReplyText((result as AgentChatResultResponse).reply);
       const traceAssistantText = assistantTextFromTraceEvents(firstArray((result as AgentChatResultResponse).events, (result as AgentChatResultResponse).traceEvents, runnerTrace?.events));
       const text = terminal
-        ? firstNonEmptyString((result as AgentChatResultResponse).assistantText, finalResponseText((result as AgentChatResultResponse).finalResponse), replyText, errorText, (result as AgentChatResultResponse).text, (result as AgentChatResultResponse).summary, traceAssistantText, message.text, "Code Agent 已完成，但没有返回可展示的 final response。") ?? message.text
+        ? terminalAgentMessageText({
+          status,
+          assistantText: (result as AgentChatResultResponse).assistantText,
+          finalText: finalResponseText((result as AgentChatResultResponse).finalResponse),
+          replyText,
+          errorText,
+          resultText: (result as AgentChatResultResponse).text,
+          summaryText: (result as AgentChatResultResponse).summary,
+          traceAssistantText
+        })
         : message.text;
       return { ...message, status, text, runnerTrace, error: error ?? message.error ?? null, agentRun: agentRun ?? undefined, updatedAt: new Date().toISOString() };
     }));
@@ -854,8 +863,17 @@ export const useWorkbenchStore = defineStore("workbench", () => {
     if (!shouldApplyActiveTraceAuthority(traceId, authoritySessionId)) return;
     const resultTrace = recordValue(result.runnerTrace);
     const traceAssistantText = assistantTextFromTraceEvents(firstArray(result.events, result.traceEvents, resultTrace?.events));
-    const text = firstNonEmptyString(result.assistantText, finalResponseText(result.finalResponse), typeof result.reply === "string" ? result.reply : result.reply?.content, agentErrorDisplayText(result.error), result.text, result.summary, traceAssistantText) ?? "Code Agent 已完成，但没有返回可展示的 final response。";
     const terminalStatus = result.status === "completed" ? "completed" : statusFromResult(result.status);
+    const text = terminalAgentMessageText({
+      status: terminalStatus,
+      assistantText: result.assistantText,
+      finalText: finalResponseText(result.finalResponse),
+      replyText: typeof result.reply === "string" ? result.reply : result.reply?.content,
+      errorText: agentErrorDisplayText(result.error),
+      resultText: result.text,
+      summaryText: result.summary,
+      traceAssistantText
+    });
     updateActiveMessages((source) => source.map((message) => {
       if (!shouldApplyTraceToMessage(message, traceId, authoritySessionId)) return message;
       const runnerTrace = mergeTerminalResultTrace(message.runnerTrace, result);
@@ -1083,7 +1101,7 @@ function normalizeChatMessage(message: ChatMessage): ChatMessage {
   const errorText = agentErrorDisplayText(error);
   const text = role === "agent"
     ? isTerminalMessageStatus(status)
-      ? firstNonEmptyString(finalText, errorText, traceAssistantText, baseText) ?? ""
+      ? terminalAgentMessageText({ status, finalText, errorText, traceAssistantText, baseText })
       : ""
     : firstNonEmptyString(baseText, finalText, traceAssistantText, errorText) ?? "";
   const messageId = firstNonEmptyString((message as Record<string, unknown>).messageId, message.id) ?? nextProtocolId("msg");
@@ -1276,6 +1294,34 @@ function agentReplyText(value: AgentChatResultResponse["reply"]): string | null
   return value && typeof value === "object" ? firstNonEmptyString(value.content) : null;
 }
 
+function terminalAgentMessageText(input: {
+  status: unknown;
+  assistantText?: unknown;
+  finalText?: string | null;
+  replyText?: string | null;
+  errorText?: string | null;
+  resultText?: unknown;
+  summaryText?: unknown;
+  traceAssistantText?: string | null;
+  baseText?: string | null;
+}): string {
+  const finalText = firstNonEmptyString(
+    input.assistantText,
+    input.finalText,
+    input.replyText,
+    input.resultText,
+    input.summaryText,
+    input.traceAssistantText,
+    input.baseText
+  );
+  if (!isFailureTerminalStatus(input.status)) return finalText ?? "";
+  return firstNonEmptyString(input.errorText, finalText) ?? "";
+}
+
+function isFailureTerminalStatus(value: unknown): boolean {
+  return ["failed", "blocked", "timeout", "canceled", "cancelled", "stale", "thread-resume-failed"].includes(String(value ?? "").trim().toLowerCase().replace(/_/gu, "-"));
+}
+
 function messageText(value: unknown): string | null {
   if (typeof value === "string") return value.trim() || null;
   if (typeof value === "number" || typeof value === "boolean") return String(value);
diff --git a/web/hwlab-cloud-web/tests/workbench-e2e/specs/event-replay.spec.ts b/web/hwlab-cloud-web/tests/workbench-e2e/specs/event-replay.spec.ts
index b3e4939b..76f929a6 100644
--- a/web/hwlab-cloud-web/tests/workbench-e2e/specs/event-replay.spec.ts
+++ b/web/hwlab-cloud-web/tests/workbench-e2e/specs/event-replay.spec.ts
@@ -18,6 +18,31 @@ test("SSE terminal event and REST gap fill replay to the same terminal UI", asyn
   await expect(page.locator(`${selectors.traceTimeline}[data-status="completed"]`)).toBeVisible();
 });
 
+test.describe("terminal completed without final response", () => {
+  test.use({ scenarioId: "terminal-completed-no-final-response" });
+
+  test("keeps the assistant final response area empty", async ({ page }, testInfo) => {
+    await gotoWorkbench(page);
+    const agentCard = page.locator(`${selectors.messageCard}[data-role="agent"]`).last();
+    await expect(agentCard).toHaveAttribute("data-status", "running");
+    await expect(agentCard).toHaveAttribute("data-status", "completed");
+    await expect(page.locator(`${selectors.traceTimeline}[data-status="completed"]`)).toBeVisible();
+
+    const snapshot = await agentCard.evaluate((element) => {
+      const placeholder = "Code Agent 已完成，但没有返回可展示的 final response。";
+      return {
+        status: element.getAttribute("data-status"),
+        messageTexts: Array.from(element.querySelectorAll(".message-markdown.message-text")).map((item) => (item.textContent ?? "").trim()),
+        bodyHasPlaceholder: document.body.textContent?.includes(placeholder) === true
+      };
+    });
+    expect(snapshot.status).toBe("completed");
+    expect(snapshot.messageTexts.filter(Boolean)).toEqual([]);
+    expect(snapshot.bodyHasPlaceholder).toBe(false);
+    await saveScreenshot(page, testInfo, "terminal-completed-no-final-response");
+  });
+});
+
 test("fresh deep link replays completed turn from the session authority", async ({ page }, testInfo) => {
   const detail = await page.request.get("/v1/workbench/sessions/ses_completed");
   expect(detail.status()).toBe(200);