diff --git a/web/hwlab-cloud-web/src/components/conversation/MessageTracePanel.test.tsx b/web/hwlab-cloud-web/src/components/conversation/MessageTracePanel.test.tsx
index 8768e33e..5f6cc3f8 100644
--- a/web/hwlab-cloud-web/src/components/conversation/MessageTracePanel.test.tsx
+++ b/web/hwlab-cloud-web/src/components/conversation/MessageTracePanel.test.tsx
@@ -83,3 +83,23 @@ test("message trace panel renders persisted fallback for expired historical trac
   assert.match(html, /sourceEventCount=31/u);
   assert.doesNotMatch(html, /等待后端事件/u);
 });
+
+test("message trace panel does not label completed traces with pending replay as expired", () => {
+  const trace: RunnerTrace = {
+    traceId: "trc_issue955_completed_replay",
+    status: "completed",
+    traceStatus: "completed",
+    events: [],
+    eventCount: 106,
+    traceSummary: { sourceEventCount: 106, terminalStatus: "completed", source: "code-agent-result" },
+    finalResponse: { text: "这里看到了 gateway sessions。" }
+  };
+
+  const html = renderToStaticMarkup(<MessageTracePanel trace={trace} defaultOpen />);
+
+  assert.match(html, /完整 trace 回放中/u);
+  assert.match(html, /traceStatus=completed/u);
+  assert.match(html, /sourceEventCount=106/u);
+  assert.match(html, /这里看到了 gateway sessions/u);
+  assert.doesNotMatch(html, /历史 trace 已过期/u);
+});
diff --git a/web/hwlab-cloud-web/src/components/conversation/MessageTracePanel.tsx b/web/hwlab-cloud-web/src/components/conversation/MessageTracePanel.tsx
index 9f3da41f..671c9287 100644
--- a/web/hwlab-cloud-web/src/components/conversation/MessageTracePanel.tsx
+++ b/web/hwlab-cloud-web/src/components/conversation/MessageTracePanel.tsx
@@ -127,16 +127,29 @@ function persistentTraceFallbackRows(trace: RunnerTrace): TraceEventRow[] {
   const sourceCount = positiveInteger(summary?.sourceEventCount ?? summary?.eventCount ?? trace.eventCount);
   if (!text && fallback?.available !== true && sourceCount === 0) return [];
   const status = firstNonEmptyTraceText(trace.traceStatus, trace.status, summary?.terminalStatus, objectOrNull(trace.agentRun)?.terminalStatus) ?? "expired";
-  const header = `${trace.traceId ?? "trace"} 历史 trace 已过期，显示持久化摘要`;
+  const expired = isExpiredTraceStatus(trace.traceStatus, trace.status) || isExpiredTraceFallback(fallback);
+  const header = expired
+    ? `${trace.traceId ?? "trace"} 历史 trace 已过期，显示持久化摘要`
+    : `${trace.traceId ?? "trace"} 完整 trace 回放中，先显示持久化摘要`;
   const meta = [
     `traceStatus=${status}`,
     sourceCount > 0 ? `sourceEventCount=${sourceCount}` : null,
     firstNonEmptyTraceText(fallback?.source, summary?.source) ? `source=${firstNonEmptyTraceText(fallback?.source, summary?.source)}` : null
   ].filter(Boolean).join("\n");
-  const body = [meta, text].filter(Boolean).join("\n\n") || "后端没有保留原始 event，但已返回持久化 trace 摘要。";
+  const body = [meta, text].filter(Boolean).join("\n\n") || (expired ? "后端没有保留原始 event，但已返回持久化 trace 摘要。" : "后端声明存在原始 event，正在通过 trace 回放入口补齐完整事件列表。");
   return [{ rowId: `fallback:${trace.traceId ?? "trace"}`, seq: null, tone: "source", header, body, terminal: true, bodyFormat: text ? "markdown" : "text" }];
 }
 
+function isExpiredTraceStatus(...values: unknown[]): boolean {
+  return values.some((value) => ["expired", "missing"].includes(String(value ?? "").trim().toLowerCase()));
+}
+
+function isExpiredTraceFallback(fallback: Record<string, unknown> | null): boolean {
+  const store = String(fallback?.liveTraceStore ?? "").trim().toLowerCase();
+  const source = String(fallback?.source ?? "").trim().toLowerCase();
+  return store.includes("expired") || source.includes("expired");
+}
+
 function objectOrNull(value: unknown): Record<string, unknown> | null {
   return value && typeof value === "object" ? value as Record<string, unknown> : null;
 }