diff --git a/web/hwlab-cloud-web/scripts/check.ts b/web/hwlab-cloud-web/scripts/check.ts
index 1d84b25c..88ad399e 100644
--- a/web/hwlab-cloud-web/scripts/check.ts
+++ b/web/hwlab-cloud-web/scripts/check.ts
@@ -35,6 +35,7 @@ const requiredFiles = Object.freeze([
   "src/components/layout/AppShell.vue",
   "src/components/layout/TablePageLayout.vue",
   "src/components/common/EmptyState.vue",
+  "src/components/workbench/MessageTraceDebugPanel.vue",
   "src/views/workbench/CodeWorkbenchView.vue",
   "src/views/admin/AccessView.vue",
   "src/views/admin/ProviderProfilesView.vue",
@@ -57,6 +58,8 @@ for (const file of requiredFiles) {
 const html = readWeb("index.html");
 const pkg = JSON.parse(readWeb("package.json")) as { dependencies?: Record<string, string>; devDependencies?: Record<string, string> };
 const appSource = readCloudWebAppSource(rootDir);
+const traceTimelineSource = readWeb("src/components/agent/TraceTimeline.vue");
+const messageTraceDebugSource = readWeb("src/components/workbench/MessageTraceDebugPanel.vue");
 
 assert.match(html, /<div id="app"><\/div>/u, "index.html must expose Vue mount root");
 assert.match(html, /src="\/src\/main\.ts"/u, "index.html must load Vue TS entry");
@@ -98,7 +101,9 @@ assertIncludes(appSource, "/v1/agent/chat/trace/", "trace replay must use Cloud
 assertIncludes(appSource, "/v1/workbench/workspace", "workspace bootstrap must use Cloud Web same-origin workbench API");
 assert.doesNotMatch(appSource, /\/auth\/workspace-bootstrap/u, "stale auth workspace bootstrap route must not remain in Cloud Web app source");
 assert.doesNotMatch(appSource, /trace-meta-details/u, "Trace details must not render a second message-detail exclamation button");
-assertIncludes(appSource, "trace-meta-panel", "Trace identity and raw-event controls must remain in the expanded trace body");
+assert.doesNotMatch(traceTimelineSource, /trace-meta-panel|trace-summary-chip|trace-meta-actions|原始事件|traceEventLabel/u, "Expanded TraceTimeline body must not render debug identity or raw-event controls");
+assertIncludes(appSource, "MessageTraceDebugPanel", "Message details dialog must mount the trace debug panel behind the top-right details button");
+assertIncludes(messageTraceDebugSource, "trace-meta-panel", "Trace identity and raw-event controls must live inside message details");
 assertIncludes(appSource, "scrollbar-width: none;", "Platform sidebar must scroll without a visible scrollbar");
 assertIncludes(appSource, "border-collapse: collapse;", "Markdown tables must use GitHub-like bordered table styling");
 assertIncludes(appSource, "grid-template-columns: minmax(0, 1fr);", "Trace rows must give the readable body the full content width");
diff --git a/web/hwlab-cloud-web/src/components/agent/TraceTimeline.vue b/web/hwlab-cloud-web/src/components/agent/TraceTimeline.vue
index e66694cd..367f4bfb 100644
--- a/web/hwlab-cloud-web/src/components/agent/TraceTimeline.vue
+++ b/web/hwlab-cloud-web/src/components/agent/TraceTimeline.vue
@@ -1,36 +1,18 @@
 <script setup lang="ts">
 import { computed, nextTick, ref, watch } from "vue";
-import type { RunnerTrace, TraceEvent } from "@/types";
-import { firstNonEmptyString } from "@/utils";
+import type { RunnerTrace } from "@/types";
 import MessageMarkdown from "@/components/workbench/MessageMarkdown.vue";
-import { traceEventBody, traceEventLabel, traceEventMeta } from "@/components/workbench/message-rendering";
-import { traceDisplayRows, traceNoiseEventCount, type TraceEventRow } from "../../../../../tools/src/hwlab-cli/trace-renderer.ts";
+import { traceDisplayRows, type TraceEventRow } from "../../../../../tools/src/hwlab-cli/trace-renderer.ts";
 
 const props = defineProps<{ trace?: RunnerTrace | null; defaultExpanded?: boolean; storageKey?: string; autoExpanded?: boolean | null }>();
 
 const listRef = ref<HTMLOListElement | null>(null);
 const following = ref(true);
 const expanded = ref(false);
-const rawMode = ref(false);
 
 const events = computed(() => Array.isArray(props.trace?.events) ? props.trace.events : []);
 const eventCount = computed(() => props.trace?.eventCount ?? events.value.length);
 const readableRows = computed(() => traceDisplayRows(traceRecord(props.trace), events.value as Record<string, unknown>[]));
-const noiseCount = computed(() => traceNoiseEventCount(events.value as Record<string, unknown>[]));
-const lastEvent = computed(() => events.value.at(-1) ?? null);
-const lastReadableRow = computed(() => readableRows.value.at(-1) ?? null);
-const lastEventLabel = computed(() => firstNonEmptyString(lastReadableRow.value?.header, props.trace?.lastEventLabel, lastEvent.value?.label, lastEvent.value?.type, lastEvent.value?.kind) ?? "未观测");
-const summaryItems = computed(() => {
-  const agentRun = recordValue(props.trace?.agentRun);
-  return [
-    { label: "status", value: firstNonEmptyString(props.trace?.status, props.trace?.traceStatus) },
-    { label: "session", value: props.trace?.sessionId },
-    { label: "thread", value: props.trace?.threadId },
-    { label: "run", value: firstNonEmptyString(agentRun?.runId, props.trace?.runId) },
-    { label: "command", value: firstNonEmptyString(agentRun?.commandId, props.trace?.commandId) },
-    { label: "waiting", value: props.trace?.waitingFor }
-  ].filter((item): item is { label: string; value: string } => Boolean(item.value));
-});
 
 watch(() => [eventCount.value, props.trace?.status, following.value, expanded.value], async () => {
   if (!following.value || !expanded.value) return;
@@ -65,10 +47,6 @@ function onScroll(): void {
   following.value = list.scrollTop + list.clientHeight >= list.scrollHeight - 24;
 }
 
-function eventKey(event: TraceEvent, index: number): string {
-  return `${event.ts ?? "no-ts"}-${event.label ?? event.type ?? event.kind ?? "event"}-${index}`;
-}
-
 function rowKey(row: TraceEventRow, index: number): string {
   return `${row.rowId}-${row.seq ?? "no-seq"}-${index}`;
 }
@@ -96,10 +74,6 @@ function traceRecord(trace: RunnerTrace | null | undefined): Record<string, unkn
   return trace && typeof trace === "object" ? trace as Record<string, unknown> : {};
 }
 
-function recordValue(value: unknown): Record<string, unknown> | null {
-  return value && typeof value === "object" ? value as Record<string, unknown> : null;
-}
-
 </script>
 
 <template>
@@ -107,54 +81,26 @@ function recordValue(value: unknown): Record<string, unknown> | null {
     <details class="trace-disclosure" :open="expanded" @toggle="onDisclosureToggle">
       <summary class="trace-disclosure-summary" aria-label="折叠运行记录">
         <span class="trace-disclosure-caret" aria-hidden="true" />
-        <span class="trace-disclosure-count">{{ readableRows.length }}/{{ eventCount }}</span>
-        <span v-if="noiseCount > 0" class="trace-disclosure-hidden">+{{ noiseCount }}</span>
+        <span class="trace-disclosure-label">运行记录</span>
       </summary>
       <div class="trace-disclosure-body">
-        <div class="trace-meta-panel" aria-label="运行记录摘要">
-          <dl class="trace-meta-grid">
-            <div><dt>trace</dt><dd>{{ trace.traceId || "pending" }}</dd></div>
-            <div><dt>rows</dt><dd>{{ readableRows.length }} / {{ eventCount }}</dd></div>
-            <div v-if="noiseCount > 0"><dt>hidden</dt><dd>{{ noiseCount }}</dd></div>
-            <div><dt>last</dt><dd>{{ lastEventLabel }}</dd></div>
-          </dl>
-          <div v-if="summaryItems.length > 0" class="trace-summary-strip" aria-label="Trace identity summary">
-            <span v-for="item in summaryItems" :key="item.label" class="trace-summary-chip"><b>{{ item.label }}</b>{{ item.value }}</span>
-          </div>
-          <p v-if="trace.eventsCompacted" class="trace-warning">当前 result 返回被压缩，已通过 trace replay 入口请求完整事件；完成前不要把压缩窗口当完整 trace。</p>
-          <p v-if="noiseCount > 0 && !rawMode" class="trace-warning">已聚合隐藏 {{ noiseCount }} 条 backend/chunk/token 噪声事件；原始 payload 仍可在原始事件中审计。</p>
-          <div class="trace-meta-actions">
-            <button class="btn btn-secondary btn-sm" type="button" @click="following = !following">{{ following ? "跟随" : "暂停" }}</button>
-            <button class="btn btn-secondary btn-sm" type="button" @click="jumpToBottom">到底部</button>
-            <button class="btn btn-secondary btn-sm" type="button" @click="rawMode = !rawMode">{{ rawMode ? "可读视图" : "原始事件" }}</button>
-          </div>
-        </div>
         <ol ref="listRef" @scroll="onScroll">
-          <template v-if="!rawMode">
-            <li v-for="(row, index) in readableRows" :key="rowKey(row, index)" class="trace-render-row" :data-event-status="row.tone" :data-terminal="row.terminal ? 'true' : 'false'" :data-row-kind="rowIsTool(row) ? 'tool' : 'message'">
-              <details v-if="rowIsTool(row)" class="trace-tool-details">
-                <summary><code>{{ row.header }}</code></summary>
-                <MessageMarkdown v-if="row.body && row.bodyFormat === 'markdown'" class="trace-row-body trace-row-markdown" :source="row.body" />
-                <pre v-else-if="row.body" class="trace-row-body">{{ row.body }}</pre>
-                <span v-else class="trace-row-body muted">已记录</span>
-              </details>
-              <template v-else>
-                <code>{{ row.header }}</code>
-                <MessageMarkdown v-if="row.body && row.bodyFormat === 'markdown'" class="trace-row-body trace-row-markdown" :source="row.body" />
-                <pre v-else-if="row.body" class="trace-row-body">{{ row.body }}</pre>
-                <span v-else class="trace-row-body muted">已记录</span>
-              </template>
-            </li>
-          </template>
-          <template v-else>
-            <li v-for="(event, index) in events" :key="eventKey(event, index)" class="trace-raw-row" :data-event-status="event.status || 'source'">
-              <code>{{ traceEventLabel(event) }}</code>
-              <span>{{ traceEventBody(event) }}</span>
-              <small v-if="traceEventMeta(event)">{{ traceEventMeta(event) }}</small>
-            </li>
-          </template>
+          <li v-for="(row, index) in readableRows" :key="rowKey(row, index)" class="trace-render-row" :data-event-status="row.tone" :data-terminal="row.terminal ? 'true' : 'false'" :data-row-kind="rowIsTool(row) ? 'tool' : 'message'">
+            <details v-if="rowIsTool(row)" class="trace-tool-details">
+              <summary><code>{{ row.header }}</code></summary>
+              <MessageMarkdown v-if="row.body && row.bodyFormat === 'markdown'" class="trace-row-body trace-row-markdown" :source="row.body" />
+              <pre v-else-if="row.body" class="trace-row-body">{{ row.body }}</pre>
+              <span v-else class="trace-row-body muted">已记录</span>
+            </details>
+            <template v-else>
+              <code>{{ row.header }}</code>
+              <MessageMarkdown v-if="row.body && row.bodyFormat === 'markdown'" class="trace-row-body trace-row-markdown" :source="row.body" />
+              <pre v-else-if="row.body" class="trace-row-body">{{ row.body }}</pre>
+              <span v-else class="trace-row-body muted">已记录</span>
+            </template>
+          </li>
         </ol>
-        <p v-if="readableRows.length === 0 && !rawMode" class="trace-empty">id={{ trace.traceId || "pending" }}；等待后端事件。</p>
+        <p v-if="readableRows.length === 0" class="trace-empty">等待后端事件。</p>
       </div>
     </details>
   </section>
diff --git a/web/hwlab-cloud-web/src/components/workbench/ConversationPanel.vue b/web/hwlab-cloud-web/src/components/workbench/ConversationPanel.vue
index daf49fe4..4ded7e12 100644
--- a/web/hwlab-cloud-web/src/components/workbench/ConversationPanel.vue
+++ b/web/hwlab-cloud-web/src/components/workbench/ConversationPanel.vue
@@ -6,6 +6,7 @@ import TraceTimeline from "@/components/agent/TraceTimeline.vue";
 import CodeAgentStatusSummary from "@/components/workbench/CodeAgentStatusSummary.vue";
 import MessageActions from "@/components/workbench/MessageActions.vue";
 import MessageMarkdown from "@/components/workbench/MessageMarkdown.vue";
+import MessageTraceDebugPanel from "@/components/workbench/MessageTraceDebugPanel.vue";
 import { useClipboard } from "@/composables/useClipboard";
 import { useWorkbenchStore } from "@/stores/workbench";
 import { traceIdentityText } from "./message-rendering";
@@ -91,6 +92,7 @@ function traceStorageKey(message: ChatMessage): string {
           <button type="button" class="dialog-close" aria-label="关闭" @click="detailMessageId = null">x</button>
         </header>
         <CodeAgentStatusSummary :message="detailMessage" />
+        <MessageTraceDebugPanel :message="detailMessage" />
         <MessageActions
           :message="detailMessage"
           @cancel="workbench.cancelAgentMessage"
diff --git a/web/hwlab-cloud-web/src/components/workbench/MessageTraceDebugPanel.vue b/web/hwlab-cloud-web/src/components/workbench/MessageTraceDebugPanel.vue
new file mode 100644
index 00000000..3898f224
--- /dev/null
+++ b/web/hwlab-cloud-web/src/components/workbench/MessageTraceDebugPanel.vue
@@ -0,0 +1,94 @@
+<script setup lang="ts">
+import { computed, nextTick, ref, watch } from "vue";
+import type { ChatMessage, RunnerTrace, TraceEvent } from "@/types";
+import { firstNonEmptyString } from "@/utils";
+import { traceEventBody, traceEventLabel, traceEventMeta } from "@/components/workbench/message-rendering";
+import { traceDisplayRows, traceNoiseEventCount } from "../../../../../tools/src/hwlab-cli/trace-renderer.ts";
+
+const props = defineProps<{ message: ChatMessage }>();
+
+const rawListRef = ref<HTMLOListElement | null>(null);
+const following = ref(true);
+const rawMode = ref(false);
+
+const trace = computed(() => props.message.runnerTrace ?? null);
+const events = computed(() => Array.isArray(trace.value?.events) ? trace.value.events : []);
+const eventCount = computed(() => trace.value?.eventCount ?? events.value.length);
+const readableRows = computed(() => traceDisplayRows(traceRecord(trace.value), events.value as Record<string, unknown>[]));
+const noiseCount = computed(() => traceNoiseEventCount(events.value as Record<string, unknown>[]));
+const lastEvent = computed(() => events.value.at(-1) ?? null);
+const lastReadableRow = computed(() => readableRows.value.at(-1) ?? null);
+const lastEventLabel = computed(() => firstNonEmptyString(lastReadableRow.value?.header, trace.value?.lastEventLabel, lastEvent.value?.label, lastEvent.value?.type, lastEvent.value?.kind) ?? "未观测");
+const traceId = computed(() => firstNonEmptyString(props.message.traceId, trace.value?.traceId) ?? "pending");
+const summaryItems = computed(() => {
+  const agentRun = recordValue(trace.value?.agentRun);
+  return [
+    { label: "status", value: firstNonEmptyString(trace.value?.status, trace.value?.traceStatus) },
+    { label: "session", value: firstNonEmptyString(props.message.sessionId, trace.value?.sessionId) },
+    { label: "thread", value: firstNonEmptyString(props.message.threadId, trace.value?.threadId) },
+    { label: "run", value: firstNonEmptyString(agentRun?.runId, trace.value?.runId) },
+    { label: "command", value: firstNonEmptyString(agentRun?.commandId, trace.value?.commandId) },
+    { label: "waiting", value: trace.value?.waitingFor }
+  ].filter((item): item is { label: string; value: string } => Boolean(item.value));
+});
+
+watch(() => [eventCount.value, rawMode.value, following.value] as const, async () => {
+  if (!rawMode.value || !following.value) return;
+  await nextTick();
+  jumpToBottom();
+});
+
+function jumpToBottom(): void {
+  const list = rawListRef.value;
+  if (!list) return;
+  list.scrollTop = list.scrollHeight;
+}
+
+function onScroll(): void {
+  const list = rawListRef.value;
+  if (!list) return;
+  following.value = list.scrollTop + list.clientHeight >= list.scrollHeight - 24;
+}
+
+function eventKey(event: TraceEvent, index: number): string {
+  return `${event.ts ?? "no-ts"}-${event.label ?? event.type ?? event.kind ?? "event"}-${index}`;
+}
+
+function traceRecord(value: RunnerTrace | null | undefined): Record<string, unknown> {
+  return value && typeof value === "object" ? value as Record<string, unknown> : {};
+}
+
+function recordValue(value: unknown): Record<string, unknown> | null {
+  return value && typeof value === "object" ? value as Record<string, unknown> : null;
+}
+</script>
+
+<template>
+  <section v-if="trace" class="message-trace-debug-panel" aria-label="Trace 调试信息">
+    <div class="trace-meta-panel" aria-label="运行记录摘要">
+      <dl class="trace-meta-grid">
+        <div><dt>trace</dt><dd>{{ traceId }}</dd></div>
+        <div><dt>rows</dt><dd>{{ readableRows.length }} / {{ eventCount }}</dd></div>
+        <div v-if="noiseCount > 0"><dt>hidden</dt><dd>{{ noiseCount }}</dd></div>
+        <div><dt>last</dt><dd>{{ lastEventLabel }}</dd></div>
+      </dl>
+      <div v-if="summaryItems.length > 0" class="trace-summary-strip" aria-label="Trace identity summary">
+        <span v-for="item in summaryItems" :key="item.label" class="trace-summary-chip"><b>{{ item.label }}</b>{{ item.value }}</span>
+      </div>
+      <p v-if="trace.eventsCompacted" class="trace-warning">当前 result 返回被压缩，已通过 trace replay 入口请求完整事件；完成前不要把压缩窗口当完整 trace。</p>
+      <p v-if="noiseCount > 0" class="trace-warning">已聚合隐藏 {{ noiseCount }} 条 backend/chunk/token 噪声事件；原始 payload 仍可在原始事件中审计。</p>
+      <div class="trace-meta-actions">
+        <button class="btn btn-secondary btn-sm" type="button" @click="following = !following">{{ following ? "跟随" : "暂停" }}</button>
+        <button class="btn btn-secondary btn-sm" type="button" @click="jumpToBottom">到底部</button>
+        <button class="btn btn-secondary btn-sm" type="button" @click="rawMode = !rawMode">{{ rawMode ? "隐藏原始事件" : "原始事件" }}</button>
+      </div>
+      <ol v-if="rawMode" ref="rawListRef" class="trace-raw-list" @scroll="onScroll">
+        <li v-for="(event, index) in events" :key="eventKey(event, index)" class="trace-raw-row" :data-event-status="event.status || 'source'">
+          <code>{{ traceEventLabel(event) }}</code>
+          <span>{{ traceEventBody(event) }}</span>
+          <small v-if="traceEventMeta(event)">{{ traceEventMeta(event) }}</small>
+        </li>
+      </ol>
+    </div>
+  </section>
+</template>
diff --git a/web/hwlab-cloud-web/src/styles/workbench.css b/web/hwlab-cloud-web/src/styles/workbench.css
index 37382353..0d27b704 100644
--- a/web/hwlab-cloud-web/src/styles/workbench.css
+++ b/web/hwlab-cloud-web/src/styles/workbench.css
@@ -899,15 +899,10 @@
   transform: rotate(90deg);
 }
 
-.trace-disclosure-count,
-.trace-disclosure-hidden {
+.trace-disclosure-label {
   line-height: 1;
 }
 
-.trace-disclosure-hidden {
-  color: #92400e;
-}
-
 .trace-disclosure-body {
   display: grid;
   gap: 5px;
@@ -959,6 +954,42 @@
   gap: 6px;
 }
 
+.message-trace-debug-panel {
+  display: grid;
+  gap: 8px;
+}
+
+.trace-raw-list {
+  display: grid;
+  max-height: min(340px, 42vh);
+  gap: 4px;
+  margin: 0;
+  overflow: auto;
+  padding: 0;
+  list-style: none;
+}
+
+.trace-raw-list li {
+  display: grid;
+  grid-template-columns: minmax(0, 1fr);
+  gap: 3px;
+  border-top: 1px solid #e2e8f0;
+  padding: 5px 0 0;
+  color: #475569;
+  font-size: 12px;
+}
+
+.trace-raw-list li:first-child {
+  border-top: 0;
+  padding-top: 0;
+}
+
+.trace-raw-list li span,
+.trace-raw-list li small {
+  min-width: 0;
+  overflow-wrap: anywhere;
+}
+
 .trace-summary-strip {
   display: flex;
   flex-wrap: wrap;