diff --git a/web/hwlab-cloud-web/scripts/workbench-r1-parity.test.ts b/web/hwlab-cloud-web/scripts/workbench-r1-parity.test.ts
new file mode 100644
index 00000000..0dd95ee6
--- /dev/null
+++ b/web/hwlab-cloud-web/scripts/workbench-r1-parity.test.ts
@@ -0,0 +1,125 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+
+import type { AgentRunProvenance, ChatMessage, TraceEvent } from "../src/types/index.ts";
+import { canCancelMessage, canReplayTrace, canRetryMessage, messageTraceId, renderSafeMarkdown, traceEventBody, traceEventLabel, traceIdentityText, visibleTraceEvents } from "../src/components/workbench/message-rendering.ts";
+
+test("R1 markdown rendering keeps structure and strips unsafe HTML", () => {
+  const html = renderSafeMarkdown("# 标题\n\n- 项目\n\n<script>alert('x')</script>\n\n[link](https://example.com)");
+  assert.match(html, /<h1>标题<\/h1>/u);
+  assert.match(html, /<li>项目<\/li>/u);
+  assert.match(html, /href="https:\/\/example.com"/u);
+  assert.doesNotMatch(html, /<script|alert/u);
+});
+
+test("R1 message actions follow per-message status and trace rules", () => {
+  const running = agentMessage({ status: "running", traceId: "trc_running", retryInput: "retry me" });
+  assert.equal(messageTraceId(running), "trc_running");
+  assert.equal(canCancelMessage(running), true);
+  assert.equal(canRetryMessage(running), true);
+  assert.equal(canReplayTrace(running), true);
+
+  const completed = agentMessage({ status: "completed", traceId: "trc_done", retryInput: "retry me" });
+  assert.equal(canCancelMessage(completed), false);
+  assert.equal(canRetryMessage(completed), false);
+  assert.equal(canReplayTrace(completed), true);
+
+  const failed = agentMessage({ status: "failed", traceId: "trc_failed", retryInput: "retry me" });
+  assert.equal(canCancelMessage(failed), false);
+  assert.equal(canRetryMessage(failed), true);
+  assert.equal(canReplayTrace(failed), true);
+
+  const user: ChatMessage = { id: "msg_user", role: "user", title: "用户", text: "hi", status: "sent", createdAt: "2026-01-01T00:00:00.000Z", traceId: "trc_user" };
+  assert.equal(canReplayTrace(user), false);
+});
+
+test("R1 trace rendering hides chunk noise without dropping meaningful events", () => {
+  const events: TraceEvent[] = [
+    { label: "assistant:delta", message: "token" },
+    { label: "command:completed", command: "npm test", exitCode: 0, elapsedMs: 42 },
+    { type: "assistant_message", text: "final", final: true }
+  ];
+  const compact = visibleTraceEvents(events, true);
+  assert.equal(compact.length, 2);
+  assert.equal(traceEventLabel(compact[0]!), "command:completed");
+  assert.equal(traceEventBody(compact[0]!), "npm test");
+  assert.equal(traceEventLabel(compact[1]!), "assistant_message");
+  assert.equal(traceEventBody(compact[1]!), "final");
+  assert.equal(visibleTraceEvents(events, false).length, 3);
+});
+
+test("R1 status summary keeps the restored 23-row floor", () => {
+  const message = agentMessage({
+    status: "failed",
+    traceId: "trc_summary",
+    conversationId: "cnv_summary",
+    sessionId: "ses_summary",
+    threadId: "thr_summary",
+    runnerTrace: {
+      traceId: "trc_summary",
+      status: "failed",
+      eventCount: 2,
+      eventsCompacted: false,
+      fullTraceLoaded: true,
+      lastEventLabel: "assistant:completed",
+      waitingFor: "result",
+      runnerKind: "agentrun",
+      sessionMode: "long-lived",
+      agentRun: {
+        runId: "run_1",
+        commandId: "cmd_1",
+        attemptId: "att_1",
+        runnerId: "runner_1",
+        jobName: "job_1",
+        namespace: "hwlab-v03",
+        terminalStatus: "failed"
+      }
+    },
+    error: { code: "provider_timeout", category: "provider", providerStatus: 504 }
+  });
+  const values = [
+    message.status,
+    message.runnerTrace?.status,
+    message.traceId,
+    message.conversationId,
+    message.sessionId,
+    message.threadId,
+    message.runnerTrace?.runnerKind,
+    message.runnerTrace?.sessionMode,
+    message.runnerTrace?.waitingFor,
+    message.runnerTrace?.lastEventLabel,
+    String(message.runnerTrace?.eventCount),
+    String(message.runnerTrace?.eventsCompacted),
+    message.runnerTrace?.fullTraceLoaded === true ? "loaded" : "unverified",
+    asAgentRun(message.runnerTrace?.agentRun)?.runId,
+    asAgentRun(message.runnerTrace?.agentRun)?.commandId,
+    asAgentRun(message.runnerTrace?.agentRun)?.attemptId,
+    asAgentRun(message.runnerTrace?.agentRun)?.runnerId,
+    asAgentRun(message.runnerTrace?.agentRun)?.jobName,
+    asAgentRun(message.runnerTrace?.agentRun)?.namespace,
+    asAgentRun(message.runnerTrace?.agentRun)?.terminalStatus,
+    message.error?.code,
+    message.error?.category,
+    String(message.error?.providerStatus)
+  ];
+  assert.equal(values.length, 23);
+  assert.equal(values.every((value) => value != null && value !== ""), true);
+  assert.match(traceIdentityText(message), /traceId=trc_summary/u);
+  assert.match(traceIdentityText(message), /sessionId=ses_summary/u);
+});
+
+function agentMessage(patch: Partial<ChatMessage>): ChatMessage {
+  return {
+    id: "msg_agent",
+    role: "agent",
+    title: "Code Agent",
+    text: "done",
+    status: "completed",
+    createdAt: "2026-01-01T00:00:00.000Z",
+    ...patch
+  } as ChatMessage;
+}
+
+function asAgentRun(value: unknown): AgentRunProvenance | null {
+  return value && typeof value === "object" ? value as AgentRunProvenance : null;
+}
diff --git a/web/hwlab-cloud-web/src/components/agent/TraceTimeline.vue b/web/hwlab-cloud-web/src/components/agent/TraceTimeline.vue
index 6b416f44..f120becb 100644
--- a/web/hwlab-cloud-web/src/components/agent/TraceTimeline.vue
+++ b/web/hwlab-cloud-web/src/components/agent/TraceTimeline.vue
@@ -1,21 +1,68 @@
 <script setup lang="ts">
-import type { RunnerTrace } from "@/types";
+import { computed, nextTick, ref, watch } from "vue";
+import type { RunnerTrace, TraceEvent } from "@/types";
+import { firstNonEmptyString } from "@/utils";
+import { traceEventBody, traceEventLabel, traceEventMeta, visibleTraceEvents } from "@/components/workbench/message-rendering";
+
+const props = defineProps<{ trace?: RunnerTrace | null }>();
+
+const listRef = ref<HTMLOListElement | null>(null);
+const following = ref(true);
+const expanded = ref(true);
+const compact = ref(true);
+
+const events = computed(() => Array.isArray(props.trace?.events) ? props.trace.events : []);
+const eventCount = computed(() => props.trace?.eventCount ?? events.value.length);
+const visibleEvents = computed(() => visibleTraceEvents(events.value, compact.value));
+const noiseCount = computed(() => Math.max(0, events.value.length - visibleEvents.value.length));
+const lastEvent = computed(() => events.value.at(-1) ?? null);
+const lastEventLabel = computed(() => firstNonEmptyString(props.trace?.lastEventLabel, lastEvent.value?.label, lastEvent.value?.type, lastEvent.value?.kind) ?? "未观测");
+
+watch(() => [eventCount.value, props.trace?.status, following.value, expanded.value], async () => {
+  if (!following.value || !expanded.value) return;
+  await nextTick();
+  jumpToBottom();
+});
+
+function jumpToBottom(): void {
+  const list = listRef.value;
+  if (!list) return;
+  list.scrollTop = list.scrollHeight;
+}
+
+function onScroll(): void {
+  const list = listRef.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}`;
+}
 
-defineProps<{ trace?: RunnerTrace | null }>();
 </script>
 
 <template>
-  <section v-if="trace" class="trace-timeline" :data-status="trace.status">
-    <header>
+  <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>
-      <span>{{ trace.traceId }}</span>
-      <small>{{ trace.eventCount ?? trace.events?.length ?? 0 }} events</small>
+      <span class="trace-id">{{ trace.traceId || "pending" }}</span>
+      <small>{{ visibleEvents.length }}/{{ eventCount }} events</small>
+      <small>last={{ lastEventLabel }}</small>
+      <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="compact = !compact">{{ compact ? "显示全部" : "低噪声" }}</button>
     </header>
-    <ol>
-      <li v-for="(event, index) in trace.events || []" :key="`${event.ts || index}-${event.label || event.type || event.kind}`">
-        <code>{{ event.label || event.type || event.kind || "event" }}</code>
-        <span>{{ event.message || event.text || event.outputSummary || event.status || "已记录" }}</span>
+    <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 && compact" class="trace-warning">已聚合隐藏 {{ noiseCount }} 条 chunk/delta/token 噪声事件。</p>
+    <ol v-show="expanded" ref="listRef" @scroll="onScroll">
+      <li v-for="(event, index) in visibleEvents" :key="eventKey(event, index)" :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 && visibleEvents.length === 0" 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/CodeAgentStatusSummary.vue b/web/hwlab-cloud-web/src/components/workbench/CodeAgentStatusSummary.vue
new file mode 100644
index 00000000..ea6a95a2
--- /dev/null
+++ b/web/hwlab-cloud-web/src/components/workbench/CodeAgentStatusSummary.vue
@@ -0,0 +1,58 @@
+<script setup lang="ts">
+import { computed } from "vue";
+import StatusBadge from "@/components/common/StatusBadge.vue";
+import type { AgentRunProvenance, ChatMessage } from "@/types";
+import { firstNonEmptyString } from "@/utils";
+
+const props = defineProps<{ message: ChatMessage }>();
+
+const trace = computed(() => props.message.runnerTrace ?? null);
+const agentRun = computed(() => asAgentRun(trace.value?.agentRun));
+const error = computed(() => props.message.error ?? null);
+const eventCount = computed(() => trace.value?.eventCount ?? trace.value?.events?.length ?? 0);
+
+const rows = computed(() => [
+  { key: "messageStatus", label: "消息状态", value: props.message.status },
+  { key: "traceStatus", label: "Trace 状态", value: firstNonEmptyString(trace.value?.status, trace.value?.traceStatus) },
+  { key: "traceId", label: "Trace", value: props.message.traceId ?? trace.value?.traceId },
+  { key: "conversationId", label: "Conversation", value: props.message.conversationId },
+  { key: "sessionId", label: "Session", value: props.message.sessionId ?? trace.value?.sessionId },
+  { key: "threadId", label: "Thread", value: props.message.threadId ?? trace.value?.threadId },
+  { key: "runnerKind", label: "Runner", value: trace.value?.runnerKind ?? agentRun.value?.adapter },
+  { key: "sessionMode", label: "Session Mode", value: trace.value?.sessionMode ?? agentRun.value?.backendProfile },
+  { key: "waitingFor", label: "Waiting For", value: trace.value?.waitingFor },
+  { key: "lastEvent", label: "Last Event", value: trace.value?.lastEventLabel },
+  { key: "eventCount", label: "Events", value: String(eventCount.value) },
+  { key: "eventsCompacted", label: "Compacted", value: trace.value?.eventsCompacted === true ? "true" : "false" },
+  { key: "fullTraceLoaded", label: "Full Trace", value: trace.value?.fullTraceLoaded === true ? "loaded" : "unverified" },
+  { key: "runId", label: "AgentRun", value: agentRun.value?.runId },
+  { key: "commandId", label: "Command", value: agentRun.value?.commandId },
+  { key: "attemptId", label: "Attempt", value: agentRun.value?.attemptId },
+  { key: "runnerId", label: "Runner ID", value: agentRun.value?.runnerId },
+  { key: "jobName", label: "Job", value: agentRun.value?.jobName },
+  { key: "namespace", label: "Namespace", value: agentRun.value?.namespace },
+  { key: "terminalStatus", label: "Terminal", value: agentRun.value?.terminalStatus },
+  { key: "errorCode", label: "Error Code", value: error.value?.code },
+  { key: "errorCategory", label: "Error Category", value: error.value?.category },
+  { key: "providerStatus", label: "Provider Status", value: error.value?.providerStatus == null ? null : String(error.value.providerStatus) }
+].map((row) => ({ ...row, value: row.value == null || row.value === "" ? "未观测" : String(row.value) })));
+
+function asAgentRun(value: unknown): AgentRunProvenance | null {
+  return value && typeof value === "object" ? value as AgentRunProvenance : null;
+}
+</script>
+
+<template>
+  <details v-if="message.role === 'agent'" class="code-agent-status-summary" :open="message.status !== 'completed'">
+    <summary>
+      <span>Code Agent 状态摘要</span>
+      <StatusBadge :status="message.status" />
+    </summary>
+    <dl>
+      <div v-for="row in rows" :key="row.key" class="code-agent-status-row" :data-status-row="row.key">
+        <dt>{{ row.label }}</dt>
+        <dd>{{ row.value }}</dd>
+      </div>
+    </dl>
+  </details>
+</template>
diff --git a/web/hwlab-cloud-web/src/components/workbench/ConversationPanel.vue b/web/hwlab-cloud-web/src/components/workbench/ConversationPanel.vue
index 3a98f662..898e4f52 100644
--- a/web/hwlab-cloud-web/src/components/workbench/ConversationPanel.vue
+++ b/web/hwlab-cloud-web/src/components/workbench/ConversationPanel.vue
@@ -1,9 +1,16 @@
 <script setup lang="ts">
+import type { ChatMessage } from "@/types";
 import StatusBadge from "@/components/common/StatusBadge.vue";
 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 { useClipboard } from "@/composables/useClipboard";
 import { useWorkbenchStore } from "@/stores/workbench";
+import { traceIdentityText } from "./message-rendering";
 
 const workbench = useWorkbenchStore();
+const clipboard = useClipboard();
 </script>
 
 <template>
@@ -13,12 +20,20 @@ const workbench = useWorkbenchStore();
         <strong>{{ message.title }}</strong>
         <StatusBadge :status="message.status" />
       </header>
-      <p class="message-text">{{ message.text }}</p>
+      <MessageMarkdown class="message-text" :source="message.text" />
       <TraceTimeline :trace="message.runnerTrace" />
+      <CodeAgentStatusSummary :message="message" />
+      <MessageActions
+        :message="message"
+        @cancel="workbench.cancelAgentMessage"
+        @retry="workbench.retryAgentMessage"
+        @replay-trace="workbench.replayAgentTrace"
+        @copy-trace="(target: ChatMessage) => clipboard.copy(traceIdentityText(target))"
+      />
     </article>
     <article v-if="workbench.messages.length === 0" class="message-card empty-message">
       <header><strong>等待会话</strong><StatusBadge status="source" label="SOURCE" /></header>
-      <p class="message-text">请先显式新建或选择 session。Code Agent 不会自动滚动新 session 掩盖失败。</p>
+      <MessageMarkdown class="message-text" source="请先显式新建或选择 session。Code Agent 不会自动滚动新 session 掩盖失败。" />
     </article>
   </section>
 </template>
diff --git a/web/hwlab-cloud-web/src/components/workbench/MessageActions.vue b/web/hwlab-cloud-web/src/components/workbench/MessageActions.vue
new file mode 100644
index 00000000..37e0952b
--- /dev/null
+++ b/web/hwlab-cloud-web/src/components/workbench/MessageActions.vue
@@ -0,0 +1,30 @@
+<script setup lang="ts">
+import { computed } from "vue";
+import type { ChatMessage } from "@/types";
+import { canCancelMessage, canReplayTrace, canRetryMessage, messageTraceId } from "./message-rendering";
+
+const props = defineProps<{ message: ChatMessage }>();
+const emit = defineEmits<{
+  cancel: [message: ChatMessage];
+  retry: [message: ChatMessage];
+  replayTrace: [message: ChatMessage];
+  copyTrace: [message: ChatMessage];
+}>();
+
+const traceId = computed(() => messageTraceId(props.message));
+const traceHref = computed(() => traceId.value ? `/v1/agent/chat/trace/${encodeURIComponent(traceId.value)}` : "#");
+const canCancel = computed(() => canCancelMessage(props.message));
+const canRetry = computed(() => canRetryMessage(props.message));
+const canReplay = computed(() => canReplayTrace(props.message));
+</script>
+
+<template>
+  <div v-if="message.role === 'agent'" class="message-actions" role="toolbar" aria-label="消息操作">
+    <button v-if="canCancel" class="btn btn-secondary btn-sm" type="button" @click="emit('cancel', message)">取消</button>
+    <button v-if="canRetry" class="btn btn-secondary btn-sm" type="button" @click="emit('retry', message)">重试</button>
+    <button v-if="canReplay" class="btn btn-secondary btn-sm" type="button" @click="emit('replayTrace', message)">回放 Trace</button>
+    <button v-if="canReplay" class="btn btn-secondary btn-sm" type="button" @click="emit('copyTrace', message)">复制 Trace</button>
+    <a v-if="canReplay" class="btn btn-secondary btn-sm" :href="traceHref" target="_blank" rel="noreferrer">打开 Trace</a>
+    <span v-if="message.traceReplayStatus" class="message-action-status">{{ message.traceReplayStatus }}</span>
+  </div>
+</template>
diff --git a/web/hwlab-cloud-web/src/components/workbench/MessageMarkdown.vue b/web/hwlab-cloud-web/src/components/workbench/MessageMarkdown.vue
new file mode 100644
index 00000000..51e213de
--- /dev/null
+++ b/web/hwlab-cloud-web/src/components/workbench/MessageMarkdown.vue
@@ -0,0 +1,11 @@
+<script setup lang="ts">
+import { computed } from "vue";
+import { renderSafeMarkdown } from "./message-rendering";
+
+const props = defineProps<{ source?: string | null }>();
+const html = computed(() => renderSafeMarkdown(props.source));
+</script>
+
+<template>
+  <div v-if="html" class="message-markdown" v-html="html" />
+</template>
diff --git a/web/hwlab-cloud-web/src/components/workbench/message-rendering.ts b/web/hwlab-cloud-web/src/components/workbench/message-rendering.ts
new file mode 100644
index 00000000..4e98547a
--- /dev/null
+++ b/web/hwlab-cloud-web/src/components/workbench/message-rendering.ts
@@ -0,0 +1,100 @@
+import createDOMPurify from "dompurify";
+import { marked } from "marked";
+import type { ChatMessage, TraceEvent } from "@/types";
+import { firstNonEmptyString } from "@/utils";
+
+marked.setOptions({ async: false, breaks: true, gfm: true });
+
+export function renderSafeMarkdown(source: string | null | undefined): string {
+  const text = source?.trim();
+  if (!text) return "";
+  const rendered = marked.parse(text) as string;
+  return sanitizeHtml(rendered, {
+    ADD_ATTR: ["target", "rel"],
+    USE_PROFILES: { html: true }
+  });
+}
+
+interface HtmlSanitizeConfig {
+  ADD_ATTR?: string[];
+  USE_PROFILES?: { html?: boolean };
+}
+
+interface HtmlSanitizer {
+  sanitize(dirty: string, config?: HtmlSanitizeConfig): string;
+}
+
+type DomPurifyFactory = (targetWindow: Window) => HtmlSanitizer;
+type DomPurifyExport = HtmlSanitizer | DomPurifyFactory;
+
+function sanitizeHtml(html: string, config: HtmlSanitizeConfig): string {
+  const purifierExport = createDOMPurify as unknown as DomPurifyExport;
+  if (hasSanitize(purifierExport)) return purifierExport.sanitize(html, config);
+  if (typeof window !== "undefined" && typeof purifierExport === "function") {
+    const purifier = purifierExport(window);
+    if (hasSanitize(purifier)) return purifier.sanitize(html, config);
+  }
+  return conservativeSanitize(html);
+}
+
+function hasSanitize(value: unknown): value is HtmlSanitizer {
+  if (typeof value !== "function" && (value === null || typeof value !== "object")) return false;
+  return typeof (value as { sanitize?: unknown }).sanitize === "function";
+}
+
+function conservativeSanitize(html: string): string {
+  return html
+    .replace(/<script\b[^>]*>[\s\S]*?<\/script>/giu, "")
+    .replace(/\son[a-z]+=("[^"]*"|'[^']*'|[^\s>]+)/giu, "")
+    .replace(/\s(href|src)=("javascript:[^"]*"|'javascript:[^']*'|javascript:[^\s>]+)/giu, "");
+}
+
+export function messageTraceId(message: ChatMessage): string | null {
+  return firstNonEmptyString(message.traceId, message.runnerTrace?.traceId);
+}
+
+export function canCancelMessage(message: ChatMessage): boolean {
+  return message.role === "agent" && String(message.status ?? "").toLowerCase() === "running" && Boolean(messageTraceId(message));
+}
+
+export function canRetryMessage(message: ChatMessage): boolean {
+  if (message.role !== "agent" || !message.retryInput) return false;
+  return ["running", "failed", "timeout", "canceled", "cancelled", "blocked"].includes(String(message.status ?? "").toLowerCase());
+}
+
+export function canReplayTrace(message: ChatMessage): boolean {
+  return message.role === "agent" && Boolean(messageTraceId(message));
+}
+
+export function traceIdentityText(message: ChatMessage): string {
+  return [
+    messageTraceId(message) ? `traceId=${messageTraceId(message)}` : null,
+    message.conversationId ? `conversationId=${message.conversationId}` : null,
+    message.sessionId ? `sessionId=${message.sessionId}` : null,
+    message.threadId ? `threadId=${message.threadId}` : null
+  ].filter((item): item is string => Boolean(item)).join("\n");
+}
+
+export function isNoiseTraceEvent(event: TraceEvent): boolean {
+  const label = String(event.label ?? event.type ?? event.kind ?? "").toLowerCase();
+  return label.includes("delta") || label.includes("chunk") || label.includes("token");
+}
+
+export function visibleTraceEvents(events: TraceEvent[], compact: boolean): TraceEvent[] {
+  return compact ? events.filter((event) => !isNoiseTraceEvent(event)) : events;
+}
+
+export function traceEventLabel(event: TraceEvent): string {
+  return firstNonEmptyString(event.label, event.type, event.kind) ?? "event";
+}
+
+export function traceEventBody(event: TraceEvent): string {
+  const body = firstNonEmptyString(event.message, event.text, event.outputSummary, event.stdoutSummary, event.stderrSummary, event.command, event.status);
+  if (body) return body;
+  if (event.exitCode != null) return `exitCode=${event.exitCode}`;
+  return "已记录";
+}
+
+export function traceEventMeta(event: TraceEvent): string {
+  return [event.ts, event.elapsedMs == null ? null : `${event.elapsedMs}ms`, event.exitCode == null ? null : `exit=${event.exitCode}`].filter((item): item is string => Boolean(item)).join(" / ");
+}
diff --git a/web/hwlab-cloud-web/src/stores/workbench.ts b/web/hwlab-cloud-web/src/stores/workbench.ts
index c32111ed..fff28996 100644
--- a/web/hwlab-cloud-web/src/stores/workbench.ts
+++ b/web/hwlab-cloud-web/src/stores/workbench.ts
@@ -119,11 +119,60 @@ export const useWorkbenchStore = defineStore("workbench", () => {
     subscribe(traceId, response.data);
   }
 
+  async function cancelAgentMessage(message: ChatMessage): Promise<void> {
+    const traceId = message.traceId ?? message.runnerTrace?.traceId;
+    if (!traceId) return;
+    await api.agent.cancelAgentMessage({ traceId, projectId: activeProjectId.value, sessionId: message.sessionId ?? selectedSessionId.value, threadId: message.threadId ?? selectedThreadId.value, conversationId: message.conversationId ?? activeConversationId.value });
+    markMessage(traceId, { status: "canceled", text: "用户已取消该 turn。" });
+    if (message.status === "running") chatPending.value = false;
+  }
+
   async function cancelRunningTrace(): Promise<void> {
     const traceId = messages.value.find((message) => message.status === "running" && message.traceId)?.traceId;
     if (!traceId) return;
-    await api.agent.cancelAgentMessage({ traceId, projectId: activeProjectId.value, sessionId: selectedSessionId.value });
-    markMessage(traceId, { status: "canceled", text: "用户已取消该 turn。" });
+    const message = messages.value.find((item) => item.traceId === traceId && item.role === "agent");
+    if (message) await cancelAgentMessage(message);
+  }
+
+  async function retryAgentMessage(message: ChatMessage): Promise<void> {
+    const retryInput = firstNonEmptyString(message.retryInput, messages.value.find((item) => item.role === "user" && item.traceId === message.traceId)?.text);
+    if (!retryInput) {
+      if (message.traceId) markMessage(message.traceId, { traceReplayStatus: "没有可重试的上一条输入。" });
+      return;
+    }
+    await submitMessage(retryInput);
+  }
+
+  async function replayAgentTrace(message: ChatMessage): Promise<void> {
+    const traceId = message.traceId ?? message.runnerTrace?.traceId;
+    if (!traceId) return;
+    markMessage(traceId, { traceReplayStatus: "Trace 回放中" });
+    const result = await api.agent.getAgentChatResult(`/v1/agent/chat/trace/${encodeURIComponent(traceId)}?projectId=${encodeURIComponent(activeProjectId.value)}`, codeAgentTimeoutMs.value, () => activityRef.value);
+    if (!result.ok || !result.data) {
+      markMessage(traceId, { traceReplayStatus: result.error ?? "Trace 回放失败" });
+      return;
+    }
+    const events = Array.isArray(result.data.events) ? result.data.events : Array.isArray(result.data.traceEvents) ? result.data.traceEvents : [];
+    const runnerTrace = mergeRunnerTrace(message.runnerTrace, {
+      ...(result.data.runnerTrace ?? {}),
+      traceId: result.data.traceId ?? traceId,
+      status: result.data.status ?? result.data.traceStatus ?? message.runnerTrace?.status,
+      sessionId: result.data.sessionId ?? message.runnerTrace?.sessionId,
+      threadId: result.data.threadId ?? message.runnerTrace?.threadId,
+      events,
+      eventCount: result.data.eventCount ?? events.length,
+      eventsCompacted: result.data.runnerTrace?.eventsCompacted ?? false,
+      fullTraceLoaded: true,
+      traceStatus: result.data.traceStatus,
+      retention: result.data.retention,
+      terminalEvidence: result.data.terminalEvidence,
+      finalResponse: result.data.finalResponse,
+      traceSummary: result.data.traceSummary,
+      agentRun: result.data.agentRun,
+      lastEventLabel: result.data.lastEventLabel ?? events.at(-1)?.label ?? events.at(-1)?.type,
+      updatedAt: new Date().toISOString()
+    });
+    markMessage(traceId, { runnerTrace, traceReplayStatus: "Trace 已回放" });
   }
 
   function setProviderProfile(value: ProviderProfile): void {
@@ -170,7 +219,7 @@ export const useWorkbenchStore = defineStore("workbench", () => {
     return workspace.value;
   }
 
-  return { projectId, workspace, conversations, messages, providerProfile, codeAgentTimeoutMs, gatewayShellTimeoutMs, live, loading, chatPending, error, activeConversationId, selectedSessionId, selectedThreadId, sessionTabs, composer, hydrate, refreshLive, createSession, selectConversation, refreshConversations, submitMessage, cancelRunningTrace, setProviderProfile, recordActivity };
+  return { projectId, workspace, conversations, messages, providerProfile, codeAgentTimeoutMs, gatewayShellTimeoutMs, live, loading, chatPending, error, activeConversationId, selectedSessionId, selectedThreadId, sessionTabs, composer, hydrate, refreshLive, createSession, selectConversation, refreshConversations, submitMessage, cancelAgentMessage, cancelRunningTrace, retryAgentMessage, replayAgentTrace, setProviderProfile, recordActivity };
 });
 
 function messagesFromWorkspace(workspace: WorkspaceRecord | null): ChatMessage[] {
diff --git a/web/hwlab-cloud-web/src/styles/workbench.css b/web/hwlab-cloud-web/src/styles/workbench.css
index 673aea4f..bbacc227 100644
--- a/web/hwlab-cloud-web/src/styles/workbench.css
+++ b/web/hwlab-cloud-web/src/styles/workbench.css
@@ -304,13 +304,61 @@
   gap: 10px;
 }
 
-.message-text {
+.message-text,
+.message-markdown {
   margin: 0;
-  white-space: pre-wrap;
   color: #1f2937;
   line-height: 1.55;
 }
 
+.message-markdown {
+  display: grid;
+  gap: 8px;
+  min-width: 0;
+}
+
+.message-markdown > * {
+  margin: 0;
+}
+
+.message-markdown ul,
+.message-markdown ol {
+  display: grid;
+  gap: 4px;
+  padding-left: 20px;
+}
+
+.message-markdown pre,
+.message-markdown code {
+  border-radius: 6px;
+  background: #0f172a;
+  color: #dbeafe;
+  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
+  font-size: 12px;
+}
+
+.message-markdown pre {
+  max-width: 100%;
+  overflow: auto;
+  padding: 10px;
+}
+
+.message-markdown code {
+  padding: 2px 4px;
+}
+
+.message-markdown pre code {
+  padding: 0;
+  background: transparent;
+}
+
+.message-markdown a {
+  color: #0e7490;
+  font-weight: 700;
+  text-decoration: underline;
+  text-underline-offset: 2px;
+}
+
 .trace-timeline {
   display: grid;
   gap: 8px;
@@ -319,6 +367,57 @@
   padding: 10px;
 }
 
+.trace-toolbar {
+  flex-wrap: wrap;
+}
+
+.trace-toolbar strong,
+.trace-id {
+  min-width: 0;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.trace-id {
+  max-width: 220px;
+  color: #475569;
+  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
+  font-size: 12px;
+}
+
+.trace-toggle {
+  min-height: 28px;
+  border: 1px solid #cbd5e1;
+  border-radius: 8px;
+  background: white;
+  color: #334155;
+  padding: 0 9px;
+  font-size: 12px;
+  font-weight: 700;
+}
+
+.trace-warning,
+.trace-empty {
+  margin: 0;
+  border-radius: 8px;
+  padding: 8px 10px;
+  font-size: 12px;
+  line-height: 1.45;
+}
+
+.trace-warning {
+  border: 1px solid #fde68a;
+  background: #fffbeb;
+  color: #92400e;
+}
+
+.trace-empty {
+  border: 1px solid #d8e1eb;
+  background: white;
+  color: #64748b;
+}
+
 .trace-timeline ol {
   display: grid;
   max-height: 170px;
@@ -331,12 +430,89 @@
 
 .trace-timeline li {
   display: grid;
-  grid-template-columns: minmax(96px, 160px) minmax(0, 1fr);
+  grid-template-columns: minmax(96px, 160px) minmax(0, 1fr) auto;
   gap: 8px;
   color: #475569;
   font-size: 12px;
 }
 
+.trace-timeline li span,
+.trace-timeline li small {
+  min-width: 0;
+  overflow-wrap: anywhere;
+}
+
+.message-actions {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: 8px;
+  border-top: 1px solid #e2e8f0;
+  padding-top: 10px;
+}
+
+.message-actions a {
+  text-decoration: none;
+}
+
+.message-action-status {
+  color: #64748b;
+  font-size: 12px;
+  font-weight: 700;
+}
+
+.code-agent-status-summary {
+  border: 1px solid #d8e1eb;
+  border-radius: 8px;
+  background: #f8fafc;
+}
+
+.code-agent-status-summary summary {
+  display: flex;
+  cursor: pointer;
+  align-items: center;
+  justify-content: space-between;
+  gap: 10px;
+  padding: 9px 10px;
+  color: #334155;
+  font-size: 12px;
+  font-weight: 800;
+}
+
+.code-agent-status-summary dl {
+  display: grid;
+  grid-template-columns: repeat(2, minmax(0, 1fr));
+  gap: 0;
+  margin: 0;
+  border-top: 1px solid #d8e1eb;
+}
+
+.code-agent-status-row {
+  display: grid;
+  grid-template-columns: minmax(110px, 0.8fr) minmax(0, 1.2fr);
+  gap: 8px;
+  border-bottom: 1px solid #e2e8f0;
+  padding: 7px 10px;
+  font-size: 12px;
+}
+
+.code-agent-status-row dt,
+.code-agent-status-row dd {
+  min-width: 0;
+  margin: 0;
+}
+
+.code-agent-status-row dt {
+  color: #64748b;
+  font-weight: 700;
+}
+
+.code-agent-status-row dd {
+  overflow-wrap: anywhere;
+  color: #1f2937;
+  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
+}
+
 .trace-timeline code,
 .mini-log,
 .json-panel,
diff --git a/web/hwlab-cloud-web/src/types/index.ts b/web/hwlab-cloud-web/src/types/index.ts
index f6b22631..a2f6487d 100644
--- a/web/hwlab-cloud-web/src/types/index.ts
+++ b/web/hwlab-cloud-web/src/types/index.ts
@@ -162,6 +162,7 @@ export interface ChatMessage {
   sessionId?: string | null;
   threadId?: string | null;
   retryInput?: string | null;
+  traceReplayStatus?: string | null;
   runnerTrace?: RunnerTrace | null;
   traceEvents?: TraceEvent[];
   error?: { code?: string; message?: string; category?: string; providerStatus?: number; [key: string]: unknown } | null;