diff --git a/web/hwlab-cloud-web/scripts/workbench-message-projection-runtime.test.ts b/web/hwlab-cloud-web/scripts/workbench-message-projection-runtime.test.ts
index dc7a787b..e905bc97 100644
--- a/web/hwlab-cloud-web/scripts/workbench-message-projection-runtime.test.ts
+++ b/web/hwlab-cloud-web/scripts/workbench-message-projection-runtime.test.ts
@@ -5,7 +5,7 @@ import assert from "node:assert/strict";
 import test from "node:test";
 
 import type { AgentChatResultResponse, ChatMessage } from "../src/types/index.ts";
-import { clearRunnerTraceTransientDiagnostics, mergeTerminalResultTrace, messageStatusPatchForTerminalMerge, messageTimingPatchForMerge, nonBlockingProjection, normalizeAgentError, projectionFromResult, shouldClearCompletedTurnDiagnostics, terminalMessagePatchFromTurnResult, terminalMessageTimingPatchForNormalize } from "../src/stores/workbench-message-projection-runtime.ts";
+import { clearRunnerTraceTransientDiagnostics, mergeTerminalResultTrace, messageStatusPatchForTerminalMerge, messageTimingPatchForMerge, messageTimingSealPatchForProjectionMerge, nonBlockingProjection, normalizeAgentError, projectionFromResult, shouldClearCompletedTurnDiagnostics, terminalMessagePatchFromTurnResult, terminalMessageTimingPatchForNormalize } from "../src/stores/workbench-message-projection-runtime.ts";
 
 test("terminal result merge preserves runner trace evidence and timing", () => {
   const previous: ChatMessage["runnerTrace"] = {
@@ -199,3 +199,29 @@ test("terminal seal blocks stale running snapshots after session restore", () =>
   assert.equal(terminal?.durationMs, 4000);
   assert.equal(terminal?.error?.message, "provider stream disconnected");
 });
+
+test("terminal projection page seal preserves final response object", () => {
+  const previous = {
+    role: "agent",
+    status: "completed",
+    text: "final answer",
+    finalResponse: { text: "final answer", status: "completed", sealed: true },
+    traceAutoLifecycle: "terminal",
+    timing: { startedAt: "2026-01-01T00:00:00.000Z", finishedAt: "2026-01-01T00:00:05.000Z", durationMs: 5000, valuesRedacted: true }
+  } as ChatMessage;
+  const incoming = {
+    role: "agent",
+    status: "running",
+    text: "",
+    traceAutoLifecycle: "running",
+    timing: { startedAt: "2026-01-01T00:00:00.000Z", valuesRedacted: true }
+  } as ChatMessage;
+
+  const patch = messageTimingSealPatchForProjectionMerge(incoming, previous);
+
+  assert.equal(patch.status, "completed");
+  assert.equal(patch.traceAutoLifecycle, "terminal");
+  assert.equal(patch.text, "final answer");
+  assert.deepEqual(patch.finalResponse, { text: "final answer", status: "completed", sealed: true });
+  assert.equal(patch.durationMs, 5000);
+});
diff --git a/web/hwlab-cloud-web/src/stores/workbench-message-projection-runtime.ts b/web/hwlab-cloud-web/src/stores/workbench-message-projection-runtime.ts
index fb70db95..5f5cfd82 100644
--- a/web/hwlab-cloud-web/src/stores/workbench-message-projection-runtime.ts
+++ b/web/hwlab-cloud-web/src/stores/workbench-message-projection-runtime.ts
@@ -217,6 +217,8 @@ function messageTerminalSealPatchForProjectionMerge(message: ChatMessage, previo
   if (!previous || !isTerminalMessageStatus(previous.status)) return incomingTimingPatch;
   const patch: Partial<ChatMessage> = { status: previous.status, traceAutoLifecycle: previous.traceAutoLifecycle ?? "terminal" };
   if (typeof previous.text === "string" && previous.text.trim()) patch.text = previous.text;
+  const finalResponse = (previous as Record<string, unknown>).finalResponse;
+  if (finalResponse) patch.finalResponse = finalResponse;
   const previousTiming = normalizeTimingProjection(previous);
   if (firstPositiveFiniteNumber(previousTiming?.durationMs) === null) return { ...terminalMessageTimingPatchForNormalize(message), ...patch };
   return { ...messageTimingPatch(previous), ...patch };