diff --git a/tools/src/hwlab-cli/trace-renderer.ts b/tools/src/hwlab-cli/trace-renderer.ts
index 4c09fc8e..01d30c90 100644
--- a/tools/src/hwlab-cli/trace-renderer.ts
+++ b/tools/src/hwlab-cli/trace-renderer.ts
@@ -357,7 +357,9 @@ function isSetupTraceEvent(event: TraceEvent): boolean {
   const label = String(event.label ?? "");
   return /^session:|^stdio:|^prompt:|^thread:|^turn:started|^turn:start|turn\/start|codex turn|tool:codex-app-server/iu.test(label) ||
     /^agentrun:backend:(codex-app-server-starting|initialize:completed|thread\/start|thread\/resume|thread\/started|turn\/start|turn\/started)/iu.test(label) ||
-    /^agentrun:(run|command|runner-job):(reuse-skipped|created)$/iu.test(label) ||
+    /^agentrun:run:(reuse-skipped|reused)$/iu.test(label) ||
+    /^agentrun:command:created$/iu.test(label) ||
+    /^agentrun:runner-job:(created|ensured|reused)$/iu.test(label) ||
     /^agentrun:session-storage-recover-warning$/iu.test(label);
 }
 
diff --git a/web/hwlab-cloud-web/scripts/workbench-r1-parity.test.ts b/web/hwlab-cloud-web/scripts/workbench-r1-parity.test.ts
index f6e89b36..9fc836b6 100644
--- a/web/hwlab-cloud-web/scripts/workbench-r1-parity.test.ts
+++ b/web/hwlab-cloud-web/scripts/workbench-r1-parity.test.ts
@@ -73,6 +73,17 @@ test("R1 shared trace renderer starts at the first user-meaningful event", () =>
   assert.doesNotMatch(rows[0]?.header ?? "", /runner-job|resource-bundle/u);
 });
 
+test("R1 shared trace renderer suppresses AgentRun reuse diagnostics", () => {
+  const rows = traceDisplayRows({ traceId: "trc_reuse", status: "running" }, [
+    { label: "agentrun:run:reused", status: "reused", message: "run reused" },
+    { label: "agentrun:runner-job:ensured", status: "runner-job-ensured", message: "runner ensured" },
+    { label: "agentrun:assistant:message", type: "assistant", message: "OK", source: "agentrun", sourceSeq: 3 }
+  ]);
+  assert.equal(rows.length, 1);
+  assert.equal(rows[0]?.body, "OK");
+  assert.doesNotMatch(rows[0]?.header ?? "", /reused|ensured|runner-job/u);
+});
+
 test("R1 trace API snapshots stay authoritative over compact result traces", () => {
   const previous = {
     traceId: "trc_merge",
diff --git a/web/hwlab-cloud-web/src/components/agent/TraceTimeline.vue b/web/hwlab-cloud-web/src/components/agent/TraceTimeline.vue
index b8d0cfb4..7c0901b6 100644
--- a/web/hwlab-cloud-web/src/components/agent/TraceTimeline.vue
+++ b/web/hwlab-cloud-web/src/components/agent/TraceTimeline.vue
@@ -69,6 +69,15 @@ function rowKey(row: TraceEventRow, index: number): string {
   return `${row.rowId}-${row.seq ?? "no-seq"}-${index}`;
 }
 
+function onDisclosureToggle(event: Event): void {
+  const target = event.currentTarget;
+  if (target instanceof HTMLDetailsElement) expanded.value = target.open;
+}
+
+function rowIsTool(row: TraceEventRow): boolean {
+  return row.rowId.startsWith("tool:") || /commandExecution/u.test(row.header);
+}
+
 function traceRecord(trace: RunnerTrace | null | undefined): Record<string, unknown> {
   return trace && typeof trace === "object" ? trace as Record<string, unknown> : {};
 }
@@ -81,44 +90,61 @@ function recordValue(value: unknown): Record<string, unknown> | null {
 
 <template>
   <section v-if="trace" class="trace-timeline" :data-status="trace.status" :data-following="following ? 'true' : 'false'">
-    <header class="trace-toolbar">
-      <button class="trace-toggle" type="button" @click="expanded = !expanded">{{ expanded ? "收起" : "展开" }}</button>
-      <strong>Trace</strong>
-    </header>
-    <details class="trace-meta-details">
-      <summary>{{ detailTitle }}</summary>
-      <div class="trace-meta-panel">
-        <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>
+    <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>
+      </summary>
+      <div class="trace-disclosure-body">
+        <details class="trace-meta-details">
+          <summary :aria-label="detailTitle" :title="detailTitle">!</summary>
+          <div class="trace-meta-panel">
+            <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>
+        </details>
+        <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>
+        </ol>
+        <p v-if="readableRows.length === 0 && !rawMode" class="trace-empty">id={{ trace.traceId || "pending" }}；等待后端事件。</p>
       </div>
     </details>
-    <ol v-show="expanded" ref="listRef" @scroll="onScroll">
-      <li v-for="(row, index) in readableRows" v-if="!rawMode" :key="rowKey(row, index)" class="trace-render-row" :data-event-status="row.tone" :data-terminal="row.terminal ? 'true' : 'false'">
-        <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>
-      </li>
-      <li v-for="(event, index) in events" v-else :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>
-    <p v-if="expanded && readableRows.length === 0 && !rawMode" class="trace-empty">trace={{ trace.traceId || "pending" }}；等待后端事件。</p>
   </section>
 </template>
diff --git a/web/hwlab-cloud-web/src/components/workbench/ConversationPanel.vue b/web/hwlab-cloud-web/src/components/workbench/ConversationPanel.vue
index a1422504..1ec4bf79 100644
--- a/web/hwlab-cloud-web/src/components/workbench/ConversationPanel.vue
+++ b/web/hwlab-cloud-web/src/components/workbench/ConversationPanel.vue
@@ -1,5 +1,5 @@
 <script setup lang="ts">
-import { computed, ref } from "vue";
+import { computed, nextTick, onMounted, ref, watch } from "vue";
 import type { ChatMessage } from "@/types";
 import StatusBadge from "@/components/common/StatusBadge.vue";
 import TraceTimeline from "@/components/agent/TraceTimeline.vue";
@@ -13,13 +13,54 @@ import { traceIdentityText } from "./message-rendering";
 
 const workbench = useWorkbenchStore();
 const clipboard = useClipboard();
+const panelRef = ref<HTMLElement | null>(null);
+const following = ref(true);
 const detailMessageId = ref<string | null>(null);
 const detailMessage = computed(() => workbench.messages.find((message) => message.id === detailMessageId.value) ?? null);
+const scrollSignature = computed(() => workbench.messages.map((message) => [
+  message.id,
+  message.status,
+  message.text?.length ?? 0,
+  message.updatedAt ?? "",
+  message.runnerTrace?.eventCount ?? message.runnerTrace?.events?.length ?? 0,
+  message.runnerTrace?.status ?? ""
+].join(":")));
+
+watch(scrollSignature, async () => {
+  if (!following.value) return;
+  await nextTick();
+  scrollToBottom();
+});
+
+onMounted(async () => {
+  await nextTick();
+  scrollToBottom();
+});
 
 function openDetails(message: ChatMessage): void {
   detailMessageId.value = message.id;
 }
 
+function isRunningMessage(message: ChatMessage): boolean {
+  return message.role === "agent" && String(message.status ?? "").toLowerCase() === "running";
+}
+
+function showStatusBadge(message: ChatMessage): boolean {
+  return message.role !== "agent" || !isRunningMessage(message);
+}
+
+function onPanelScroll(): void {
+  const panel = panelRef.value;
+  if (!panel) return;
+  following.value = panel.scrollTop + panel.clientHeight >= panel.scrollHeight - 56;
+}
+
+function scrollToBottom(): void {
+  const panel = panelRef.value;
+  if (!panel) return;
+  panel.scrollTop = panel.scrollHeight;
+}
+
 function traceDefaultExpanded(message: ChatMessage): boolean {
   return !isTerminalStatus(message.runnerTrace?.status ?? message.status);
 }
@@ -30,13 +71,14 @@ function traceStorageKey(message: ChatMessage): string {
 </script>
 
 <template>
-  <section class="conversation-panel" id="conversation-list">
+  <section id="conversation-list" ref="panelRef" class="conversation-panel" :data-following="following ? 'true' : 'false'" @scroll="onPanelScroll">
     <article v-for="message in workbench.messages" :key="message.id" class="message-card" :data-role="message.role" :data-status="message.status">
       <header v-if="message.role !== 'user'">
         <strong>{{ message.title }}</strong>
         <div class="message-header-actions">
-          <StatusBadge :status="message.status" />
-          <button v-if="message.role === 'agent'" class="message-detail-button" type="button" aria-label="消息详情" title="消息详情" @click="openDetails(message)">i</button>
+          <span v-if="isRunningMessage(message)" class="agent-running-indicator" aria-label="运行中" role="status"><span /><span /><span /></span>
+          <StatusBadge v-if="showStatusBadge(message)" :status="message.status" />
+          <button v-if="message.role === 'agent'" class="message-detail-button" type="button" aria-label="运行详情" title="运行详情" @click="openDetails(message)">!</button>
         </div>
       </header>
       <TraceTimeline v-if="message.role === 'agent' && message.runnerTrace" :trace="message.runnerTrace" :default-expanded="traceDefaultExpanded(message)" :storage-key="traceStorageKey(message)" />
diff --git a/web/hwlab-cloud-web/src/stores/workbench.ts b/web/hwlab-cloud-web/src/stores/workbench.ts
index 6ce80ba2..902f9222 100644
--- a/web/hwlab-cloud-web/src/stores/workbench.ts
+++ b/web/hwlab-cloud-web/src/stores/workbench.ts
@@ -142,7 +142,7 @@ export const useWorkbenchStore = defineStore("workbench", () => {
     const sessionId = composer.value.sessionId;
     const threadId = composer.value.threadId;
     const user = makeMessage("user", value, "sent", { traceId: steerTraceId ?? traceId, conversationId, sessionId, threadId, title: steerMode ? "用户引导" : "用户" });
-    const pending = makeMessage("agent", "正在处理这次 Code Agent 请求；复杂问题可能需要几分钟。", "running", { traceId, conversationId, sessionId, threadId, title: "Code Agent 处理中", retryInput: value });
+    const pending = makeMessage("agent", "", "running", { traceId, conversationId, sessionId, threadId, title: "Code Agent", retryInput: value });
     messages.value.push(user, pending);
     chatPending.value = true;
     currentRequest.value = { traceId, conversationId, sessionId, threadId, status: "running" };
@@ -262,7 +262,7 @@ export const useWorkbenchStore = defineStore("workbench", () => {
 
   function reattachTrace(traceId: string): void {
     const initial: AgentChatResponse = { status: "running", traceId, resultUrl: `/v1/agent/chat/result/${encodeURIComponent(traceId)}?projectId=${encodeURIComponent(activeProjectId.value)}` };
-    if (!messages.value.some((message) => message.traceId === traceId)) messages.value.push(makeMessage("agent", "正在重新连接运行中的 trace。", "running", { traceId, title: "Trace reattach" }));
+    if (!messages.value.some((message) => message.traceId === traceId)) messages.value.push(makeMessage("agent", "", "running", { traceId, title: "Code Agent" }));
     subscribe(traceId, initial);
   }
 
diff --git a/web/hwlab-cloud-web/src/styles/workbench.css b/web/hwlab-cloud-web/src/styles/workbench.css
index 9dc49393..eac521be 100644
--- a/web/hwlab-cloud-web/src/styles/workbench.css
+++ b/web/hwlab-cloud-web/src/styles/workbench.css
@@ -35,23 +35,23 @@
   display: grid;
   min-width: 0;
   min-height: 0;
-  grid-template-rows: 58px minmax(0, 1fr);
+  grid-template-rows: 44px minmax(0, 1fr);
 }
 
 .platform-topbar {
   display: flex;
   align-items: center;
-  gap: 16px;
+  gap: 10px;
   border-bottom: 1px solid #d8e1eb;
   background: rgba(248, 250, 252, 0.92);
-  padding: 0 18px;
+  padding: 0 12px;
 }
 
 .platform-content {
   min-height: 0;
   min-width: 0;
   overflow: auto;
-  padding: 22px;
+  padding: 12px;
 }
 
 .platform-content > * {
@@ -515,7 +515,7 @@
   min-height: 0;
   height: 100%;
   grid-template-columns: auto minmax(0, 1fr) minmax(280px, 360px);
-  gap: 14px;
+  gap: 8px;
 }
 
 .workbench-center,
@@ -548,8 +548,8 @@
   min-height: 0;
   min-width: 0;
   align-content: start;
-  gap: 12px;
-  padding: 14px;
+  gap: 8px;
+  padding: 10px;
   overflow: hidden;
 }
 
@@ -580,7 +580,7 @@
 .conversation-panel {
   display: grid;
   min-height: 0;
-  gap: 10px;
+  gap: 6px;
   overflow: auto;
 }
 
@@ -623,7 +623,8 @@
 
 .conversation-panel {
   align-content: start;
-  padding: 14px;
+  padding: 8px;
+  scroll-behavior: smooth;
 }
 
 .conversation-empty-hint {
@@ -634,17 +635,36 @@
 }
 
 .message-card {
+  position: relative;
   display: grid;
   align-self: start;
-  gap: 6px;
+  gap: 5px;
   border-radius: 4px;
   padding: 8px;
+  overflow: hidden;
 }
 
 .message-card[data-role="agent"] {
   width: 100%;
 }
 
+.message-card[data-role="agent"][data-status="running"] {
+  border-color: #7dd3fc;
+  background: linear-gradient(180deg, #ffffff 0%, #f8fdff 100%);
+}
+
+.message-card[data-role="agent"][data-status="running"]::before {
+  position: absolute;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 2px;
+  background: linear-gradient(90deg, transparent, #0891b2, #22c55e, transparent);
+  content: "";
+  transform: translateX(-100%);
+  animation: agent-run-scan 1.6s ease-in-out infinite;
+}
+
 .message-card[data-role="user"] {
   justify-self: end;
   width: max-content;
@@ -681,9 +701,45 @@
 }
 
 .message-detail-button {
-  border: 0;
+  display: inline-flex;
+  width: 22px;
+  height: 22px;
+  align-items: center;
+  justify-content: center;
+  border: 1px solid #cbd5e1;
+  border-radius: 999px;
+  background: white;
+  color: #475569;
   cursor: pointer;
   padding: 0;
+  font-size: 12px;
+  font-weight: 850;
+  line-height: 1;
+}
+
+.agent-running-indicator {
+  display: inline-flex;
+  width: 28px;
+  height: 18px;
+  align-items: center;
+  justify-content: center;
+  gap: 3px;
+}
+
+.agent-running-indicator span {
+  width: 5px;
+  height: 5px;
+  border-radius: 999px;
+  background: #0891b2;
+  animation: agent-run-dot 900ms ease-in-out infinite;
+}
+
+.agent-running-indicator span:nth-child(2) {
+  animation-delay: 120ms;
+}
+
+.agent-running-indicator span:nth-child(3) {
+  animation-delay: 240ms;
 }
 
 .message-text,
@@ -743,37 +799,105 @@
 
 .trace-timeline {
   display: grid;
-  gap: 6px;
+  gap: 4px;
   border: 1px solid #e2e8f0;
   border-radius: 3px;
   background: #f8fafc;
-  padding: 6px;
+  padding: 4px;
 }
 
-.trace-toolbar {
-  justify-content: flex-start;
-  gap: 6px;
-  min-height: 26px;
+.trace-disclosure {
+  display: grid;
+  gap: 5px;
+}
+
+.trace-disclosure summary::-webkit-details-marker,
+.trace-meta-details summary::-webkit-details-marker,
+.trace-tool-details summary::-webkit-details-marker {
+  display: none;
+}
+
+.trace-disclosure-summary {
+  display: inline-flex;
+  width: max-content;
+  min-height: 22px;
+  align-items: center;
+  gap: 5px;
+  border: 1px solid #d8e1eb;
+  border-radius: 3px;
+  background: white;
+  color: #475569;
+  cursor: pointer;
+  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
+  font-size: 11px;
+  font-weight: 800;
+  list-style: none;
+  padding: 2px 6px;
+}
+
+.trace-disclosure-caret {
+  width: 0;
+  height: 0;
+  border-top: 4px solid transparent;
+  border-bottom: 4px solid transparent;
+  border-left: 6px solid #0f766e;
+  transition: transform 120ms ease;
+}
+
+.trace-disclosure[open] > .trace-disclosure-summary .trace-disclosure-caret {
+  transform: rotate(90deg);
+}
+
+.trace-disclosure-count,
+.trace-disclosure-hidden {
+  line-height: 1;
+}
+
+.trace-disclosure-hidden {
+  color: #92400e;
+}
+
+.trace-disclosure-body {
+  display: grid;
+  gap: 5px;
 }
 
 .trace-meta-details {
-  border: 1px solid #e2e8f0;
-  border-radius: 3px;
-  background: #ffffff;
+  display: grid;
+  justify-items: start;
 }
 
 .trace-meta-details summary {
+  display: inline-flex;
+  width: 22px;
+  height: 22px;
+  align-items: center;
+  justify-content: center;
+  border: 1px solid #cbd5e1;
+  border-radius: 999px;
+  background: white;
   cursor: pointer;
-  padding: 5px 7px;
   color: #475569;
   font-size: 12px;
-  font-weight: 700;
+  font-weight: 850;
+  line-height: 1;
+  list-style: none;
+  padding: 0;
+}
+
+.trace-meta-details[open] summary {
+  border-color: #0891b2;
+  color: #0f766e;
 }
 
 .trace-meta-panel {
   display: grid;
   gap: 6px;
-  border-top: 1px solid #e2e8f0;
+  width: 100%;
+  margin-top: 5px;
+  border: 1px solid #e2e8f0;
+  border-radius: 3px;
+  background: white;
   padding: 6px;
 }
 
@@ -840,7 +964,6 @@
   text-transform: uppercase;
 }
 
-.trace-toolbar strong,
 .trace-id {
   min-width: 0;
   overflow: hidden;
@@ -855,17 +978,6 @@
   font-size: 12px;
 }
 
-.trace-toggle {
-  min-height: 24px;
-  border: 1px solid #cbd5e1;
-  border-radius: 3px;
-  background: white;
-  color: #334155;
-  padding: 0 7px;
-  font-size: 12px;
-  font-weight: 700;
-}
-
 .trace-warning,
 .trace-empty {
   margin: 0;
@@ -897,6 +1009,43 @@
   list-style: none;
 }
 
+.trace-tool-details {
+  display: grid;
+  min-width: 0;
+  gap: 5px;
+}
+
+.trace-tool-details > summary {
+  display: flex;
+  min-width: 0;
+  align-items: center;
+  gap: 6px;
+  cursor: pointer;
+  list-style: none;
+}
+
+.trace-tool-details > summary::before {
+  width: 0;
+  height: 0;
+  flex: 0 0 auto;
+  border-top: 4px solid transparent;
+  border-bottom: 4px solid transparent;
+  border-left: 6px solid #64748b;
+  content: "";
+  transition: transform 120ms ease;
+}
+
+.trace-tool-details[open] > summary::before {
+  transform: rotate(90deg);
+}
+
+.trace-tool-details > summary code {
+  min-width: 0;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
 .trace-timeline li {
   display: grid;
   grid-template-columns: minmax(0, 1fr);
@@ -1037,6 +1186,16 @@
   overflow-wrap: anywhere;
 }
 
+@keyframes agent-run-scan {
+  0% { transform: translateX(-100%); }
+  55%, 100% { transform: translateX(100%); }
+}
+
+@keyframes agent-run-dot {
+  0%, 80%, 100% { opacity: 0.35; transform: translateY(0); }
+  40% { opacity: 1; transform: translateY(-3px); }
+}
+
 .command-composer {
   display: grid;
   gap: 10px;
@@ -2104,7 +2263,7 @@
   .platform-main {
     height: 100dvh;
     min-height: 0;
-    grid-template-rows: 58px minmax(0, 1fr);
+    grid-template-rows: 44px minmax(0, 1fr);
   }
 
   .platform-content {