diff --git a/web/hwlab-cloud-web/src/state/runner-trace.test.ts b/web/hwlab-cloud-web/src/state/runner-trace.test.ts
index 7611f26c..2e3e294a 100644
--- a/web/hwlab-cloud-web/src/state/runner-trace.test.ts
+++ b/web/hwlab-cloud-web/src/state/runner-trace.test.ts
@@ -94,6 +94,36 @@ test("mergeTraceResults prefers terminal result markdown over non-final flattene
   assert.doesNotMatch(merged.assistantText ?? "", /^I'll read context first/u);
 });
 
+test("mergeTraceResults prefers structured result markdown over flattened trace finalResponse", () => {
+  const resultMarkdown = "ISSUE959_MARKDOWN_OK\n\n## hwpod-spec 机制说明\n\n- 第一条\n- 第二条\n\n```bash\nhwpod-cli run --spec .hwlab/hwpod-spec.yaml\n```";
+  const flattenedFinalResponse = "Let me read context first.ISSUE959_MARKDOWN_OK ## hwpod-spec 机制说明 - 第一条 - 第二条 ```bash hwpod-cli run --spec .hwlab/hwpod-spec.yaml ```";
+  const terminal: AgentChatResultResponse = {
+    status: "completed",
+    traceId: "trc_issue959_finalresponse_flattened",
+    assistantText: flattenedFinalResponse,
+    reply: { role: "assistant", content: resultMarkdown }
+  };
+  const events: TraceEvent[] = [
+    { seq: 31, label: "agentrun:assistant:message", type: "assistant", status: "running", message: flattenedFinalResponse },
+    { seq: 36, label: "agentrun:assistant:message", type: "assistant", status: "running", message: flattenedFinalResponse },
+    { seq: 42, label: "agentrun:result:completed", type: "result", status: "completed", terminal: true, message: "AgentRun result is ready for HWLAB short-connection polling." }
+  ];
+  const trace: TraceSnapshot = {
+    traceId: "trc_issue959_finalresponse_flattened",
+    status: "completed",
+    events,
+    eventCount: events.length,
+    finalResponse: { text: flattenedFinalResponse },
+    lastEventLabel: "agentrun:result:completed"
+  };
+
+  const merged = mergeTraceResults(terminal, trace);
+
+  assert.equal(merged.assistantText, resultMarkdown);
+  assert.match(merged.assistantText ?? "", /ISSUE959_MARKDOWN_OK\n\n## hwpod-spec/u);
+  assert.doesNotMatch(merged.assistantText ?? "", /^Let me read context first/u);
+});
+
 test("mergeTraceResults prefers persisted finalResponse text for expired or compact natural traces", () => {
   const finalMarkdown = "**结论**\n\n- 自然结束和刷新后都应该显示这一段。\n- Markdown 换行必须保留。";
   const terminal: AgentChatResultResponse = {
diff --git a/web/hwlab-cloud-web/src/state/runner-trace.ts b/web/hwlab-cloud-web/src/state/runner-trace.ts
index ea5e5d4b..3dca1854 100644
--- a/web/hwlab-cloud-web/src/state/runner-trace.ts
+++ b/web/hwlab-cloud-web/src/state/runner-trace.ts
@@ -97,10 +97,12 @@ export function mergeTraceResults(terminal: AgentChatResultResponse, trace: Trac
   const terminalRunnerEvents = Array.isArray(terminalRunnerTrace?.events) ? terminalRunnerTrace.events : [];
   const events = longestTraceEvents(traceEvents, terminalEvents, terminalRunnerEvents);
   const mergedTrace = { ...trace, events, eventCount: trace.eventCount ?? events.length };
-  const assistantText = finalResponseText(trace.finalResponse)
-    ?? terminalAssistantTextFromTraceEvents(events)
-    ?? firstNonEmptyResultText(terminal)
-    ?? assistantTextFromTraceEvents(events);
+  const assistantText = bestAssistantTextCandidate([
+    { text: finalResponseText(trace.finalResponse), priority: 40 },
+    { text: terminalAssistantTextFromTraceEvents(events), priority: 30 },
+    { text: firstNonEmptyResultText(terminal), priority: 20 },
+    { text: assistantTextFromTraceEvents(events), priority: 10 }
+  ]);
   return {
     ...terminal,
     traceId: trace.traceId ?? terminal.traceId,
@@ -144,7 +146,53 @@ function mergeTerminalRunnerTrace(terminalTrace: AgentChatResultResponse["runner
 function firstNonEmptyResultText(result: AgentChatResultResponse): string | null {
   const reply = result.reply;
   const replyText = typeof reply === "string" ? reply : typeof reply?.content === "string" ? reply.content : null;
-  return firstNonEmptyString(result.assistantText, replyText);
+  return bestAssistantTextCandidate([
+    { text: result.assistantText, priority: 20 },
+    { text: replyText, priority: 10 }
+  ]);
+}
+
+interface AssistantTextCandidate {
+  text: string | null | undefined;
+  priority: number;
+}
+
+function bestAssistantTextCandidate(candidates: AssistantTextCandidate[]): string | null {
+  const scored: Array<{ text: string; fidelity: number; priority: number; index: number }> = [];
+  candidates.forEach((candidate, index) => {
+    const text = firstNonEmptyString(candidate.text);
+    if (!text) return;
+    scored.push({ text, fidelity: markdownBlockFidelityScore(text), priority: candidate.priority, index });
+  });
+  const best = scored.reduce<typeof scored[number] | null>((currentBest, current) => {
+    if (!currentBest || compareAssistantTextCandidate(current, currentBest) > 0) return current;
+    return currentBest;
+  }, null);
+  return best?.text ?? null;
+}
+
+function compareAssistantTextCandidate(
+  left: { fidelity: number; priority: number; index: number },
+  right: { fidelity: number; priority: number; index: number }
+): number {
+  if (left.fidelity !== right.fidelity) return left.fidelity - right.fidelity;
+  if (left.priority !== right.priority) return left.priority - right.priority;
+  return right.index - left.index;
+}
+
+function markdownBlockFidelityScore(text: string): number {
+  const newlineCount = (text.match(/\n/gu) ?? []).length;
+  const headingCount = (text.match(/^#{1,6}\s+/gmu) ?? []).length;
+  const listItemCount = (text.match(/^\s*(?:[-*+] |\d+\.\s+)/gmu) ?? []).length;
+  const codeFenceCount = (text.match(/^```/gmu) ?? []).length;
+  const tableRowCount = (text.match(/^\s*\|.*\|\s*$/gmu) ?? []).length;
+  const paragraphBreakCount = (text.match(/\n\s*\n/gu) ?? []).length;
+  return Math.min(newlineCount, 24)
+    + headingCount * 8
+    + listItemCount * 4
+    + codeFenceCount * 8
+    + tableRowCount * 4
+    + paragraphBreakCount * 3;
 }
 
 function assistantTextFromTraceEvents(events: TraceEvent[]): string | null {