diff --git a/src/agentkit/server/frontend/components.d.ts b/src/agentkit/server/frontend/components.d.ts
index 7f9ead0..135177e 100644
--- a/src/agentkit/server/frontend/components.d.ts
+++ b/src/agentkit/server/frontend/components.d.ts
@@ -16,6 +16,7 @@ declare module 'vue' {
     AButton: typeof import('ant-design-vue/es')['Button']
     ACard: typeof import('ant-design-vue/es')['Card']
     ACheckbox: typeof import('ant-design-vue/es')['Checkbox']
+    ACheckboxGroup: typeof import('ant-design-vue/es')['CheckboxGroup']
     ACol: typeof import('ant-design-vue/es')['Col']
     ACollapse: typeof import('ant-design-vue/es')['Collapse']
     ACollapsePanel: typeof import('ant-design-vue/es')['CollapsePanel']
@@ -64,12 +65,18 @@ declare module 'vue' {
     ATabs: typeof import('ant-design-vue/es')['Tabs']
     ATag: typeof import('ant-design-vue/es')['Tag']
     ATextarea: typeof import('ant-design-vue/es')['Textarea']
+    ATimePicker: typeof import('ant-design-vue/es/time-picker/dayjs')['TimePicker']
     AUploadDragger: typeof import('ant-design-vue/es')['UploadDragger']
     BoardBannerCard: typeof import('./src/components/chat/messages/BoardBannerCard.vue')['default']
     BoardConclusionCard: typeof import('./src/components/chat/messages/BoardConclusionCard.vue')['default']
     BoardMeetingModal: typeof import('./src/components/chat/BoardMeetingModal.vue')['default']
     BoardRoundCard: typeof import('./src/components/chat/messages/BoardRoundCard.vue')['default']
     BoardStatusView: typeof import('./src/components/chat/BoardStatusView.vue')['default']
+    CalendarDrawer: typeof import('./src/components/calendar/CalendarDrawer.vue')['default']
+    CalendarGrid: typeof import('./src/components/calendar/CalendarGrid.vue')['default']
+    CalendarPanel: typeof import('./src/components/calendar/CalendarPanel.vue')['default']
+    CalendarTab: typeof import('./src/components/layout/tabs/CalendarTab.vue')['default']
+    CardView: typeof import('./src/components/calendar/CardView.vue')['default']
     ChangePasswordPanel: typeof import('./src/components/settings/ChangePasswordPanel.vue')['default']
     ChatInput: typeof import('./src/components/chat/ChatInput.vue')['default']
     ChatMessage: typeof import('./src/components/chat/ChatMessage.vue')['default']
@@ -80,8 +87,16 @@ declare module 'vue' {
     ConditionNode: typeof import('./src/components/workflow/ConditionNode.vue')['default']
     ContextPill: typeof import('./src/components/chat/ContextPill.vue')['default']
     DashboardOverview: typeof import('./src/components/evolution/DashboardOverview.vue')['default']
+    DebateArgumentCard: typeof import('./src/components/chat/messages/DebateArgumentCard.vue')['default']
+    DebateBannerCard: typeof import('./src/components/chat/messages/DebateBannerCard.vue')['default']
+    DebateConclusionCard: typeof import('./src/components/chat/messages/DebateConclusionCard.vue')['default']
+    DebateSummaryCard: typeof import('./src/components/chat/messages/DebateSummaryCard.vue')['default']
+    DocumentCard: typeof import('./src/components/chat/messages/DocumentCard.vue')['default']
+    DocumentPanel: typeof import('./src/components/chat/DocumentPanel.vue')['default']
     DocumentUpload: typeof import('./src/components/kb/DocumentUpload.vue')['default']
     ErrorCard: typeof import('./src/components/chat/messages/ErrorCard.vue')['default']
+    EventBadge: typeof import('./src/components/calendar/EventBadge.vue')['default']
+    EventEditor: typeof import('./src/components/calendar/EventEditor.vue')['default']
     ExperiencePanel: typeof import('./src/components/evolution/ExperiencePanel.vue')['default']
     ExperienceTimeline: typeof import('./src/components/evolution/ExperienceTimeline.vue')['default']
     ExpertMessage: typeof import('./src/components/chat/ExpertMessage.vue')['default']
@@ -91,7 +106,9 @@ declare module 'vue' {
     FileTree: typeof import('./src/components/code/FileTree.vue')['default']
     FlowCanvas: typeof import('./src/components/workflow/FlowCanvas.vue')['default']
     IconNav: typeof import('./src/components/layout/IconNav.vue')['default']
+    InvitationManager: typeof import('./src/components/calendar/InvitationManager.vue')['default']
     KnowledgeTab: typeof import('./src/components/layout/tabs/KnowledgeTab.vue')['default']
+    ListView: typeof import('./src/components/calendar/ListView.vue')['default']
     MentionDropdown: typeof import('./src/components/chat/MentionDropdown.vue')['default']
     MessageShell: typeof import('./src/components/chat/messages/MessageShell.vue')['default']
     MetricsChart: typeof import('./src/components/evolution/MetricsChart.vue')['default']
@@ -105,6 +122,7 @@ declare module 'vue' {
     PlanVisualization: typeof import('./src/components/chat/PlanVisualization.vue')['default']
     PropertyPanel: typeof import('./src/components/workflow/PropertyPanel.vue')['default']
     QuadrantPanel: typeof import('./src/components/layout/QuadrantPanel.vue')['default']
+    ReminderConfig: typeof import('./src/components/calendar/ReminderConfig.vue')['default']
     RightPanel: typeof import('./src/components/layout/RightPanel.vue')['default']
     RouterLink: typeof import('vue-router')['RouterLink']
     RouterView: typeof import('vue-router')['RouterView']
@@ -123,6 +141,7 @@ declare module 'vue' {
     SourceConfig: typeof import('./src/components/kb/SourceConfig.vue')['default']
     SplashScreen: typeof import('./src/components/layout/SplashScreen.vue')['default']
     SplitPane: typeof import('./src/components/layout/SplitPane.vue')['default']
+    SyncSettings: typeof import('./src/components/calendar/SyncSettings.vue')['default']
     SystemMonitorPanel: typeof import('./src/components/layout/SystemMonitorPanel.vue')['default']
     SystemTab: typeof import('./src/components/layout/tabs/SystemTab.vue')['default']
     TeamModal: typeof import('./src/components/chat/TeamModal.vue')['default']
diff --git a/src/agentkit/server/frontend/src/api/types.ts b/src/agentkit/server/frontend/src/api/types.ts
index 4330b27..0678afb 100644
--- a/src/agentkit/server/frontend/src/api/types.ts
+++ b/src/agentkit/server/frontend/src/api/types.ts
@@ -58,6 +58,10 @@ export interface IChatMessage {
     | 'board_speech'
     | 'board_summary'
     | 'board_conclusion'
+    | 'debate_started'
+    | 'debate_argument'
+    | 'debate_summary'
+    | 'debate_resolved'
     | 'error'
   board_round?: number
   board_role?: 'moderator' | 'expert' | 'user' | 'summary'
@@ -65,6 +69,13 @@ export interface IChatMessage {
   error_detail?: string
   board_started?: IBoardStartedData
   board_conclusion?: IBoardConcludedData
+  debate_topic?: string
+  debate_round?: number
+  debate_decision?: string
+  debate_rationale?: string
+  debate_participants?: string[]
+  debate_opening?: string
+  debate_moderator?: string
 }
 
 /** Conversation with messages */
@@ -132,6 +143,12 @@ export type WsServerMessage =
   | { type: 'round_summary'; data: IRoundSummaryData }
   | { type: 'user_intervention'; data: IUserInterventionData }
   | { type: 'board_concluded'; data: IBoardConcludedData }
+  // Debate (U5) 事件
+  | { type: 'debate_started'; data: IDebateStartedData }
+  | { type: 'expert_argument'; data: IDebateArgumentData }
+  | { type: 'debate_round_summary'; data: IDebateRoundSummaryData }
+  | { type: 'debate_resolved'; data: IDebateResolvedData }
+  | { type: 'team_intervention_ack'; data: { content: string } }
   // Calendar 事件 (KTD-10 — piggyback on chat WS)
   | { type: 'calendar_event_created'; data: ICalendarEventCreatedData }
   | { type: 'calendar_reminder'; data: ICalendarReminderData }
@@ -225,6 +242,47 @@ export interface IBoardConcludedData {
   error?: string
 }
 
+// ── Debate (U5) 模式类型 ──────────────────────────────────────────────
+
+/** debate_started event payload */
+export interface IDebateStartedData {
+  phase_id: string
+  phase_name: string
+  topic: string
+  participants: string[]
+  max_rounds: number
+  opening: string
+}
+
+/** expert_argument event payload */
+export interface IDebateArgumentData {
+  phase_id: string
+  expert_id: string
+  expert_name: string
+  expert_color: string
+  content: string
+  round: number
+  topic: string
+}
+
+/** debate_round_summary event payload */
+export interface IDebateRoundSummaryData {
+  phase_id: string
+  moderator_name: string
+  content: string
+  round: number
+  continue: boolean
+}
+
+/** debate_resolved event payload */
+export interface IDebateResolvedData {
+  phase_id: string
+  phase_name: string
+  decision: 'adopt' | 'compromise' | 'shelve' | 'inconclusive'
+  conclusion: string
+  rationale: string
+}
+
 /** Board meeting status (matches backend BoardStatus enum) */
 export type BoardStatus = 'forming' | 'discussing' | 'concluding' | 'completed' | 'dissolved'
 
diff --git a/src/agentkit/server/frontend/src/components/chat/ChatInput.vue b/src/agentkit/server/frontend/src/components/chat/ChatInput.vue
index 482c6f6..7e57a93 100644
--- a/src/agentkit/server/frontend/src/components/chat/ChatInput.vue
+++ b/src/agentkit/server/frontend/src/components/chat/ChatInput.vue
@@ -78,6 +78,16 @@
           <template #icon><TeamOutlined /></template>
           私董会
         </a-button>
+        <a-button
+          v-if="teamStore?.isTeamMode"
+          size="small"
+          :disabled="disabled && !teamStore?.isTeamMode"
+          @click="handleDebateClick"
+          class="chat-input__action-btn chat-input__action-btn--debate"
+          title="发起辩论"
+        >
+          <template #icon><CommentOutlined /></template>辩论
+        </a-button>
         <a-button
           size="small"
           :disabled="disabled || fileUploading"
@@ -129,12 +139,13 @@
 <script setup lang="ts">
 import { ref, computed, onMounted, onUnmounted, type Component } from 'vue'
 import { Input as AInput, Button as AButton, Select as ASelect } from 'ant-design-vue'
-import { SendOutlined, TeamOutlined, UsergroupAddOutlined, PaperClipOutlined, PoweroffOutlined } from '@ant-design/icons-vue'
+import { SendOutlined, TeamOutlined, UsergroupAddOutlined, PaperClipOutlined, PoweroffOutlined, CommentOutlined } from '@ant-design/icons-vue'
 import ContextPill from './ContextPill.vue'
 import MentionDropdown from './MentionDropdown.vue'
 import BoardMeetingModal from './BoardMeetingModal.vue'
 import TeamModal from './TeamModal.vue'
 import { useSkillsStore } from '@/stores/skills'
+import { useTeamStore } from '@/stores/team'
 import type { ISkillInfo } from '@/api/skills'
 import { getDynamicBaseURL } from '@/api/base'
 import { apiClient } from '@/api/client'
@@ -230,6 +241,7 @@ const mentionQuery = ref('')
 const mentionStartIndex = ref(-1)
 const mentionPosition = ref({ left: 0 })
 const skillsStore = useSkillsStore()
+const teamStore = useTeamStore()
 
 const skillSuggestions = computed<SkillSuggestion[]>(() => {
   return (skillsStore.skills || []).map((s: ISkillInfo) => ({
@@ -318,6 +330,14 @@ function handleTeamSubmit(command: string): void {
   emit('send', command, selectedModel.value)
 }
 
+function handleDebateClick(): void {
+  // Prompt user for debate topic, then send as intervention
+  const topic = window.prompt('请输入辩论主题')
+  if (topic && topic.trim()) {
+    emit('send', `/debate ${topic.trim()}`, selectedModel.value)
+  }
+}
+
 function openFilePicker(): void {
   fileInputRef.value?.click()
 }
@@ -563,6 +583,17 @@ function removePill(idx: number): void {
   background: var(--accent-board-soft);
 }
 
+.chat-input__action-btn--debate {
+  color: #722ed1;
+  border-color: #d3adf7;
+}
+
+.chat-input__action-btn--debate:not(:disabled):hover {
+  color: #531dab;
+  border-color: #722ed1;
+  background: #f9f0ff;
+}
+
 .chat-input__action-btn--clear {
   color: var(--text-tertiary);
 }
diff --git a/src/agentkit/server/frontend/src/components/chat/helpers/useMessageRenderer.ts b/src/agentkit/server/frontend/src/components/chat/helpers/useMessageRenderer.ts
index 23018ee..48846ce 100644
--- a/src/agentkit/server/frontend/src/components/chat/helpers/useMessageRenderer.ts
+++ b/src/agentkit/server/frontend/src/components/chat/helpers/useMessageRenderer.ts
@@ -6,6 +6,10 @@ import TeamPlanCard from '@/components/chat/messages/TeamPlanCard.vue'
 import BoardBannerCard from '@/components/chat/messages/BoardBannerCard.vue'
 import BoardRoundCard from '@/components/chat/messages/BoardRoundCard.vue'
 import BoardConclusionCard from '@/components/chat/messages/BoardConclusionCard.vue'
+import DebateBannerCard from '@/components/chat/messages/DebateBannerCard.vue'
+import DebateArgumentCard from '@/components/chat/messages/DebateArgumentCard.vue'
+import DebateSummaryCard from '@/components/chat/messages/DebateSummaryCard.vue'
+import DebateConclusionCard from '@/components/chat/messages/DebateConclusionCard.vue'
 import ErrorCard from '@/components/chat/messages/ErrorCard.vue'
 
 export type MessageViewType =
@@ -16,6 +20,10 @@ export type MessageViewType =
   | 'board_speech'
   | 'board_summary'
   | 'board_conclusion'
+  | 'debate_started'
+  | 'debate_argument'
+  | 'debate_summary'
+  | 'debate_resolved'
   | 'milestone'
   | 'error'
 
@@ -48,6 +56,14 @@ export function resolveMessageType(message: IChatMessage): MessageViewType {
       return 'board_summary'
     case 'board_conclusion':
       return 'board_conclusion'
+    case 'debate_started':
+      return 'debate_started'
+    case 'debate_argument':
+      return 'debate_argument'
+    case 'debate_summary':
+      return 'debate_summary'
+    case 'debate_resolved':
+      return 'debate_resolved'
     case 'milestone':
       return 'milestone'
     default:
@@ -168,6 +184,83 @@ export function useMessageRenderer(message: IChatMessage) {
           },
         }
 
+      case 'debate_started':
+        return {
+          type,
+          shell: {
+            name: '辩论',
+            avatar: '⚖',
+            color: '#722ed1',
+            meta: message.debate_topic || '',
+          },
+          component: DebateBannerCard,
+          props: {
+            topic: message.debate_topic || '',
+            participants: message.debate_participants || [],
+            opening: message.debate_opening || message.content,
+          },
+        }
+
+      case 'debate_argument':
+        return {
+          type,
+          shell: {
+            name: message.expert_name || '专家',
+            avatar: (message.expert_name || '?')[0],
+            color: message.expert_color || '#722ed1',
+            meta: `辩论第${message.debate_round || 1}轮`,
+          },
+          component: DebateArgumentCard,
+          props: {
+            content: message.content,
+            round: message.debate_round || 1,
+            expertName: message.expert_name || '',
+            expertColor: message.expert_color || '#722ed1',
+          },
+        }
+
+      case 'debate_summary':
+        return {
+          type,
+          shell: {
+            name: message.expert_name || 'Lead',
+            avatar: (message.expert_name || 'L')[0],
+            color: '#722ed1',
+            meta: `第${message.debate_round || 1}轮小结`,
+          },
+          component: DebateSummaryCard,
+          props: {
+            content: message.content,
+            round: message.debate_round || 1,
+            moderatorName: message.debate_moderator || message.expert_name || '',
+          },
+        }
+
+      case 'debate_resolved': {
+        const decisionLabels: Record<string, string> = {
+          adopt: '采纳',
+          compromise: '折中',
+          shelve: '搁置',
+          inconclusive: '未决',
+        }
+        const decision = message.debate_decision || 'inconclusive'
+        return {
+          type,
+          shell: {
+            name: '辩论裁决',
+            avatar: '⚖',
+            color: '#fa8c16',
+            meta: decisionLabels[decision] || decision,
+          },
+          component: DebateConclusionCard,
+          props: {
+            conclusion: message.content,
+            decision,
+            rationale: message.debate_rationale || '',
+          },
+        }
+      }
+
       case 'error':
         return {
           type,
diff --git a/src/agentkit/server/frontend/src/components/chat/messages/DebateArgumentCard.vue b/src/agentkit/server/frontend/src/components/chat/messages/DebateArgumentCard.vue
new file mode 100644
index 0000000..b14c316
--- /dev/null
+++ b/src/agentkit/server/frontend/src/components/chat/messages/DebateArgumentCard.vue
@@ -0,0 +1,46 @@
+<template>
+  <div class="debate-argument" :style="{ borderLeftColor: expertColor }">
+    <div class="debate-argument__header">
+      <span class="debate-argument__name" :style="{ color: expertColor }">{{ expertName }}</span>
+      <a-tag color="purple">第{{ round }}轮</a-tag>
+    </div>
+    <AssistantText :message="textMessage" />
+  </div>
+</template>
+
+<script setup lang="ts">
+import { computed } from 'vue'
+import AssistantText from './AssistantText.vue'
+import type { IChatMessage } from '@/api/types'
+
+const props = defineProps<{
+  content: string
+  round: number
+  expertName: string
+  expertColor: string
+}>()
+
+const textMessage = computed<IChatMessage>(() => ({
+  id: `debate-arg-${props.expertName}-${props.round}`,
+  role: 'assistant',
+  content: props.content,
+  timestamp: new Date().toISOString(),
+  status: 'completed',
+}))
+</script>
+
+<style scoped>
+.debate-argument {
+  padding: 8px 12px;
+  border-left: 3px solid #722ed1;
+  background: #fafafa;
+  border-radius: 4px;
+}
+.debate-argument__header {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  margin-bottom: 6px;
+}
+.debate-argument__name { font-weight: 600; }
+</style>
diff --git a/src/agentkit/server/frontend/src/components/chat/messages/DebateBannerCard.vue b/src/agentkit/server/frontend/src/components/chat/messages/DebateBannerCard.vue
new file mode 100644
index 0000000..260a173
--- /dev/null
+++ b/src/agentkit/server/frontend/src/components/chat/messages/DebateBannerCard.vue
@@ -0,0 +1,53 @@
+<template>
+  <div class="debate-banner">
+    <div class="debate-banner__icon">⚖</div>
+    <div class="debate-banner__body">
+      <div class="debate-banner__title">辩论开始</div>
+      <div class="debate-banner__topic">{{ topic }}</div>
+      <div class="debate-banner__participants">
+        <span class="debate-banner__label">参与专家：</span>
+        <a-tag v-for="p in participants" :key="p" color="purple">{{ p }}</a-tag>
+      </div>
+      <div v-if="opening" class="debate-banner__opening">
+        <AssistantText :message="openingMessage" />
+      </div>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { computed } from 'vue'
+import AssistantText from './AssistantText.vue'
+import type { IChatMessage } from '@/api/types'
+
+const props = defineProps<{
+  topic: string
+  participants: string[]
+  opening: string
+}>()
+
+const openingMessage = computed<IChatMessage>(() => ({
+  id: 'debate-opening',
+  role: 'assistant',
+  content: props.opening,
+  timestamp: new Date().toISOString(),
+  status: 'completed',
+}))
+</script>
+
+<style scoped>
+.debate-banner {
+  display: flex;
+  gap: 12px;
+  padding: 12px 16px;
+  border-left: 3px solid #722ed1;
+  background: #f9f0ff;
+  border-radius: 4px;
+}
+.debate-banner__icon { font-size: 24px; }
+.debate-banner__title { font-weight: 600; color: #722ed1; margin-bottom: 4px; }
+.debate-banner__topic { font-size: 14px; margin-bottom: 8px; }
+.debate-banner__participants { display: flex; align-items: center; gap: 4px; flex-wrap: wrap; margin-bottom: 8px; }
+.debate-banner__label { font-size: 12px; color: #666; }
+.debate-banner__opening { margin-top: 8px; }
+</style>
diff --git a/src/agentkit/server/frontend/src/components/chat/messages/DebateConclusionCard.vue b/src/agentkit/server/frontend/src/components/chat/messages/DebateConclusionCard.vue
new file mode 100644
index 0000000..8f2b835
--- /dev/null
+++ b/src/agentkit/server/frontend/src/components/chat/messages/DebateConclusionCard.vue
@@ -0,0 +1,81 @@
+<template>
+  <div class="debate-conclusion" :class="`debate-conclusion--${decision}`">
+    <div class="debate-conclusion__header">
+      <span class="debate-conclusion__icon">{{ decisionIcon }}</span>
+      <span class="debate-conclusion__decision">{{ decisionLabel }}</span>
+    </div>
+    <div class="debate-conclusion__body">
+      <AssistantText :message="textMessage" />
+    </div>
+    <div v-if="rationale" class="debate-conclusion__rationale">
+      <span class="debate-conclusion__rationale-label">理由：</span>
+      <span>{{ rationale }}</span>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { computed } from 'vue'
+import AssistantText from './AssistantText.vue'
+import type { IChatMessage } from '@/api/types'
+
+const props = defineProps<{
+  conclusion: string
+  decision: string
+  rationale: string
+}>()
+
+const decisionLabels: Record<string, string> = {
+  adopt: '采纳',
+  compromise: '折中',
+  shelve: '搁置',
+  inconclusive: '未决',
+}
+const decisionIcons: Record<string, string> = {
+  adopt: '✓',
+  compromise: '⇄',
+  shelve: '○',
+  inconclusive: '?',
+}
+
+const decisionLabel = computed(() => decisionLabels[props.decision] || props.decision)
+const decisionIcon = computed(() => decisionIcons[props.decision] || '?')
+
+const textMessage = computed<IChatMessage>(() => ({
+  id: 'debate-conclusion',
+  role: 'assistant',
+  content: props.conclusion,
+  timestamp: new Date().toISOString(),
+  status: 'completed',
+}))
+</script>
+
+<style scoped>
+.debate-conclusion {
+  padding: 12px 16px;
+  border-left: 3px solid #fa8c16;
+  background: #fff7e6;
+  border-radius: 4px;
+}
+.debate-conclusion--adopt { border-left-color: #52c41a; background: #f6ffed; }
+.debate-conclusion--compromise { border-left-color: #faad14; background: #fffbe6; }
+.debate-conclusion--shelve { border-left-color: #bfbfbf; background: #f5f5f5; }
+.debate-conclusion--inconclusive { border-left-color: #ff4d4f; background: #fff2f0; }
+
+.debate-conclusion__header {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  margin-bottom: 8px;
+}
+.debate-conclusion__icon { font-size: 18px; font-weight: bold; }
+.debate-conclusion__decision { font-weight: 600; font-size: 14px; }
+.debate-conclusion__body { margin-bottom: 8px; }
+.debate-conclusion__rationale {
+  font-size: 12px;
+  color: #666;
+  padding-top: 8px;
+  border-top: 1px dashed #d9d9d9;
+}
+.debate-conclusion__rationale-label { font-weight: 600; }
+</style>
diff --git a/src/agentkit/server/frontend/src/components/chat/messages/DebateSummaryCard.vue b/src/agentkit/server/frontend/src/components/chat/messages/DebateSummaryCard.vue
new file mode 100644
index 0000000..e1c52ff
--- /dev/null
+++ b/src/agentkit/server/frontend/src/components/chat/messages/DebateSummaryCard.vue
@@ -0,0 +1,46 @@
+<template>
+  <div class="debate-summary">
+    <div class="debate-summary__header">
+      <span class="debate-summary__moderator">{{ moderatorName }}</span>
+      <a-tag color="orange">第{{ round }}轮小结</a-tag>
+    </div>
+    <AssistantText :message="textMessage" />
+  </div>
+</template>
+
+<script setup lang="ts">
+import { computed } from 'vue'
+import AssistantText from './AssistantText.vue'
+import type { IChatMessage } from '@/api/types'
+
+const props = defineProps<{
+  content: string
+  round: number
+  moderatorName: string
+}>()
+
+const textMessage = computed<IChatMessage>(() => ({
+  id: `debate-summary-${props.round}`,
+  role: 'assistant',
+  content: props.content,
+  timestamp: new Date().toISOString(),
+  status: 'completed',
+}))
+</script>
+
+<style scoped>
+.debate-summary {
+  padding: 8px 12px;
+  border-left: 3px solid #fa8c16;
+  background: #fff7e6;
+  border-radius: 4px;
+  margin-left: 16px;
+}
+.debate-summary__header {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  margin-bottom: 6px;
+}
+.debate-summary__moderator { font-weight: 600; color: #fa8c16; }
+</style>
diff --git a/src/agentkit/server/frontend/src/components/chat/messages/index.ts b/src/agentkit/server/frontend/src/components/chat/messages/index.ts
index 45b8142..b67d448 100644
--- a/src/agentkit/server/frontend/src/components/chat/messages/index.ts
+++ b/src/agentkit/server/frontend/src/components/chat/messages/index.ts
@@ -5,5 +5,9 @@ export { default as TeamPlanCard } from './TeamPlanCard.vue'
 export { default as BoardBannerCard } from './BoardBannerCard.vue'
 export { default as BoardRoundCard } from './BoardRoundCard.vue'
 export { default as BoardConclusionCard } from './BoardConclusionCard.vue'
+export { default as DebateBannerCard } from './DebateBannerCard.vue'
+export { default as DebateArgumentCard } from './DebateArgumentCard.vue'
+export { default as DebateSummaryCard } from './DebateSummaryCard.vue'
+export { default as DebateConclusionCard } from './DebateConclusionCard.vue'
 export { default as ErrorCard } from './ErrorCard.vue'
 export { default as FileAttachment } from './FileAttachment.vue'
diff --git a/src/agentkit/server/frontend/src/stores/chat.ts b/src/agentkit/server/frontend/src/stores/chat.ts
index 48db053..5b5b142 100644
--- a/src/agentkit/server/frontend/src/stores/chat.ts
+++ b/src/agentkit/server/frontend/src/stores/chat.ts
@@ -10,6 +10,10 @@ import type {
   IChatRequest,
   WsClientMessage,
   WsServerMessage,
+  IDebateStartedData,
+  IDebateArgumentData,
+  IDebateRoundSummaryData,
+  IDebateResolvedData,
 } from '@/api/types'
 
 function generateId(): string {
@@ -148,6 +152,15 @@ export const useChatStore = defineStore('chat', () => {
 
   const isBoardMode = computed(() => boardState.value !== null && boardState.value.status === 'discussing')
 
+  // Debate state (transient, only active during a debate collaboration)
+  const debateState = ref<{
+    topic: string
+    participants: string[]
+    current_round: number
+    max_rounds: number
+    status: 'debating' | 'resolved' | 'cancelled'
+  } | null>(null)
+
   // --- Getters ---
   const currentConversation = computed<IConversation | undefined>(() => {
     return conversations.value.find((c) => c.id === currentConversationId.value)
@@ -1199,6 +1212,130 @@ export const useChatStore = defineStore('chat', () => {
         }, 1000)
         break
       }
+
+      // ── Debate events (U5) ──────────────────────────────────────────
+
+      case 'debate_started': {
+        const d = data.data as IDebateStartedData
+        debateState.value = {
+          topic: d.topic,
+          participants: d.participants,
+          current_round: 0,
+          max_rounds: d.max_rounds,
+          status: 'debating',
+        }
+        const sessionId = resolveIncomingConvId()
+        if (!sessionId) break
+        appendMessage(sessionId, {
+          id: generateId(),
+          role: 'assistant',
+          content: d.opening,
+          timestamp: new Date().toISOString(),
+          status: 'completed',
+          message_type: 'debate_started',
+          debate_topic: d.topic,
+          debate_participants: d.participants,
+          debate_opening: d.opening,
+        })
+        appendStep({ type: 'team_event', label: '辩论开始', detail: d.topic.slice(0, 40), status: 'success' }, sessionId)
+        break
+      }
+
+      case 'expert_argument': {
+        const d = data.data as IDebateArgumentData
+        debateState.value = {
+          ...(debateState.value as NonNullable<typeof debateState.value>),
+          current_round: d.round,
+        }
+        const sessionId = resolveIncomingConvId()
+        if (!sessionId) break
+        appendMessage(sessionId, {
+          id: generateId(),
+          role: 'assistant',
+          content: d.content,
+          timestamp: new Date().toISOString(),
+          status: 'completed',
+          message_type: 'debate_argument',
+          expert_name: d.expert_name,
+          expert_color: d.expert_color,
+          debate_topic: d.topic,
+          debate_round: d.round,
+        })
+        appendStep({
+          type: 'team_event',
+          label: d.expert_name,
+          detail: `辩论第${d.round}轮`,
+          status: 'success',
+        }, sessionId)
+        break
+      }
+
+      case 'debate_round_summary': {
+        const d = data.data as IDebateRoundSummaryData
+        const sessionId = resolveIncomingConvId()
+        if (!sessionId) break
+        appendMessage(sessionId, {
+          id: generateId(),
+          role: 'assistant',
+          content: d.content,
+          timestamp: new Date().toISOString(),
+          status: 'completed',
+          message_type: 'debate_summary',
+          expert_name: d.moderator_name,
+          debate_round: d.round,
+          debate_moderator: d.moderator_name,
+        })
+        appendStep({
+          type: 'team_event',
+          label: d.moderator_name,
+          detail: `第${d.round}轮小结`,
+          status: 'success',
+        }, sessionId)
+        break
+      }
+
+      case 'debate_resolved': {
+        const d = data.data as IDebateResolvedData
+        if (debateState.value) {
+          debateState.value = { ...debateState.value, status: 'resolved' }
+        }
+        const sessionId = resolveIncomingConvId()
+        if (!sessionId) break
+        appendMessage(sessionId, {
+          id: generateId(),
+          role: 'assistant',
+          content: d.conclusion,
+          timestamp: new Date().toISOString(),
+          status: 'completed',
+          message_type: 'debate_resolved',
+          debate_decision: d.decision,
+          debate_rationale: d.rationale,
+        })
+        appendStep({
+          type: 'team_event',
+          label: '辩论裁决',
+          detail: d.decision,
+          status: 'success',
+        }, sessionId)
+        // Clear debate state after 1 second (same pattern as board_concluded)
+        setTimeout(() => { debateState.value = null }, 1000)
+        break
+      }
+
+      case 'team_intervention_ack': {
+        // User intervention was accepted by the server — no message needed,
+        // just a step entry for visibility.
+        const d = data.data as { content: string }
+        const sessionId = resolveIncomingConvId()
+        if (!sessionId) break
+        appendStep({
+          type: 'team_event',
+          label: '用户干预',
+          detail: d.content.slice(0, 40),
+          status: 'success',
+        }, sessionId)
+        break
+      }
     }
   }
 
@@ -1251,6 +1388,7 @@ export const useChatStore = defineStore('chat', () => {
     pendingConversations,
     streamingStepsByConv,
     boardState,
+    debateState,
     // Legacy aliases (derive from current conversation for backward compat).
     // New code should use `isCurrentLoading` / `currentStreamingSteps` instead.
     isLoading: isCurrentLoading,