diff --git a/app/components/agent/AgentChatArea.vue b/app/components/agent/AgentChatArea.vue
index 6783ec2..bb713d1 100644
--- a/app/components/agent/AgentChatArea.vue
+++ b/app/components/agent/AgentChatArea.vue
@@ -33,6 +33,8 @@ const props = defineProps<{
   systemPrompt?: string;
   sessionId?: string | null;
   agentTools?: ToolInfo[];
+  agentName?: string;
+  agentDescription?: string;
 }>();
 
 const emit = defineEmits<{
@@ -112,6 +114,8 @@ watch(
       <AgentWelcome
         v-if="messages.length === 0"
         :logged-in="loggedIn"
+        :agent-name="agentName"
+        :agent-description="agentDescription"
         @example="handleExample"
       />
 
diff --git a/app/components/agent/AgentSidebar.vue b/app/components/agent/AgentSidebar.vue
index 7d3ee9e..d66c249 100644
--- a/app/components/agent/AgentSidebar.vue
+++ b/app/components/agent/AgentSidebar.vue
@@ -8,6 +8,7 @@ const props = defineProps<{
   user: { name?: string | null; email?: string | null; role?: string | null } | null;
   collapsed: boolean;
   mobile?: boolean;
+  currentAgentSlug?: string;
 }>();
 
 const emit = defineEmits<{
@@ -20,6 +21,7 @@ const emit = defineEmits<{
   toggle: [];
   close: [];
   showDocuments: [];
+  switchAgent: [slug: string];
 }>();
 
 const isAdmin = computed(() => props.user?.role === "admin");
@@ -29,13 +31,20 @@ const isAdmin = computed(() => props.user?.role === "admin");
   <!-- Desktop: inline flex sidebar (hidden on mobile via CSS) -->
   <aside class="agent-sidebar desktop" :class="{ collapsed }">
     <div class="sidebar-header">
-      <button class="new-chat-btn" @click="emit('newSession')">
-        <Icon name="lucide:plus" />
-        <span>新对话</span>
-      </button>
-      <button class="collapse-btn" @click="emit('toggle')">
-        <Icon :name="collapsed ? 'lucide:chevrons-right' : 'lucide:chevrons-left'" />
-      </button>
+      <AgentSwitcher
+        v-if="currentAgentSlug"
+        :current-slug="currentAgentSlug"
+        @switch="emit('switchAgent', $event)"
+      />
+      <div class="sidebar-header-row">
+        <button class="new-chat-btn" @click="emit('newSession')">
+          <Icon name="lucide:plus" />
+          <span>新对话</span>
+        </button>
+        <button class="collapse-btn" @click="emit('toggle')">
+          <Icon :name="collapsed ? 'lucide:chevrons-right' : 'lucide:chevrons-left'" />
+        </button>
+      </div>
     </div>
 
     <div class="sidebar-sessions">
@@ -100,13 +109,20 @@ const isAdmin = computed(() => props.user?.role === "admin");
       <Transition name="sidebar-slide">
         <aside v-if="mobile && !collapsed" class="agent-sidebar mobile">
           <div class="sidebar-header">
-            <button class="new-chat-btn" @click="emit('newSession')">
-              <Icon name="lucide:plus" />
-              <span>新对话</span>
-            </button>
-            <button class="collapse-btn" @click="emit('close')">
-              <Icon name="lucide:x" />
-            </button>
+            <AgentSwitcher
+              v-if="currentAgentSlug"
+              :current-slug="currentAgentSlug"
+              @switch="emit('switchAgent', $event)"
+            />
+            <div class="sidebar-header-row">
+              <button class="new-chat-btn" @click="emit('newSession')">
+                <Icon name="lucide:plus" />
+                <span>新对话</span>
+              </button>
+              <button class="collapse-btn" @click="emit('close')">
+                <Icon name="lucide:x" />
+              </button>
+            </div>
           </div>
 
           <div class="sidebar-sessions">
@@ -188,12 +204,18 @@ const isAdmin = computed(() => props.user?.role === "admin");
 
 .sidebar-header {
   display: flex;
-  align-items: center;
+  flex-direction: column;
   gap: 8px;
   padding: 12px;
   flex-shrink: 0;
 }
 
+.sidebar-header-row {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+
 .new-chat-btn {
   display: flex;
   align-items: center;
diff --git a/app/components/agent/AgentSwitcher.vue b/app/components/agent/AgentSwitcher.vue
new file mode 100644
index 0000000..3695e4f
--- /dev/null
+++ b/app/components/agent/AgentSwitcher.vue
@@ -0,0 +1,247 @@
+<script setup lang="ts">
+interface AgentInfo {
+  slug: string;
+  name: string;
+  description?: string | null;
+}
+
+const props = defineProps<{
+  currentSlug: string;
+}>();
+
+const emit = defineEmits<{
+  switch: [slug: string];
+}>();
+
+const open = ref(false);
+const agents = ref<AgentInfo[]>([]);
+const loading = ref(false);
+const dropdownRef = ref<HTMLElement | null>(null);
+
+const currentAgent = computed(() =>
+  agents.value.find((a) => a.slug === props.currentSlug) ?? null,
+);
+const displayName = computed(() => currentAgent.value?.name ?? "智能助手");
+
+async function loadAgents() {
+  loading.value = true;
+  try {
+    const res = await $fetch<{ code: number; data: { list: AgentInfo[] } }>("/api/agents");
+    agents.value = res.data?.list ?? [];
+  } catch {
+    agents.value = [];
+  } finally {
+    loading.value = false;
+  }
+}
+
+function toggle() {
+  if (!open.value && agents.value.length === 0) {
+    loadAgents();
+  }
+  open.value = !open.value;
+}
+
+function pick(slug: string) {
+  open.value = false;
+  if (slug !== props.currentSlug) {
+    emit("switch", slug);
+  }
+}
+
+function handleClickOutside(e: MouseEvent) {
+  if (dropdownRef.value && !dropdownRef.value.contains(e.target as Node)) {
+    open.value = false;
+  }
+}
+
+onMounted(() => {
+  document.addEventListener("click", handleClickOutside);
+});
+
+onBeforeUnmount(() => {
+  document.removeEventListener("click", handleClickOutside);
+});
+</script>
+
+<template>
+  <div ref="dropdownRef" class="agent-switcher">
+    <button class="switcher-trigger" :class="{ active: open }" @click="toggle">
+      <Icon name="lucide:bot" class="trigger-icon" />
+      <span class="trigger-name">{{ displayName }}</span>
+      <Icon name="lucide:chevron-down" class="trigger-arrow" :class="{ rotated: open }" />
+    </button>
+
+    <Transition name="dropdown">
+      <div v-if="open" class="switcher-dropdown">
+        <div v-if="loading" class="dropdown-loading">加载中…</div>
+        <template v-else>
+          <button
+            v-for="a in agents"
+            :key="a.slug"
+            class="dropdown-item"
+            :class="{ selected: a.slug === currentSlug }"
+            @click="pick(a.slug)"
+          >
+            <Icon
+              :name="a.slug === currentSlug ? 'lucide:check' : 'lucide:bot'"
+              class="item-icon"
+            />
+            <div class="item-meta">
+              <div class="item-name">{{ a.name }}</div>
+              <div v-if="a.description" class="item-desc">{{ a.description }}</div>
+            </div>
+          </button>
+          <div v-if="agents.length === 0" class="dropdown-empty">暂无可用 agent</div>
+        </template>
+      </div>
+    </Transition>
+  </div>
+</template>
+
+<style scoped>
+.agent-switcher {
+  position: relative;
+  flex-shrink: 0;
+}
+
+.switcher-trigger {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  width: 100%;
+  padding: 8px 10px;
+  background: var(--color-surface-card);
+  border: 1px solid var(--color-hairline);
+  border-radius: 10px;
+  font-size: 13px;
+  font-weight: 500;
+  color: var(--color-ink);
+  cursor: pointer;
+  transition: all 0.15s;
+}
+
+.switcher-trigger:hover {
+  border-color: var(--color-primary);
+  background: var(--color-canvas);
+}
+
+.switcher-trigger.active {
+  border-color: var(--color-primary);
+}
+
+.trigger-icon {
+  font-size: 15px;
+  color: var(--color-primary);
+  flex-shrink: 0;
+}
+
+.trigger-name {
+  flex: 1;
+  text-align: left;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.trigger-arrow {
+  font-size: 14px;
+  color: var(--color-muted);
+  flex-shrink: 0;
+  transition: transform 0.2s;
+}
+
+.trigger-arrow.rotated {
+  transform: rotate(180deg);
+}
+
+.switcher-dropdown {
+  position: absolute;
+  top: calc(100% + 4px);
+  left: 0;
+  right: 0;
+  background: var(--color-canvas);
+  border: 1px solid var(--color-hairline);
+  border-radius: 10px;
+  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
+  z-index: 50;
+  max-height: 320px;
+  overflow-y: auto;
+  padding: 4px;
+}
+
+.dropdown-loading,
+.dropdown-empty {
+  padding: 16px;
+  text-align: center;
+  font-size: 13px;
+  color: var(--color-muted);
+}
+
+.dropdown-item {
+  display: flex;
+  align-items: flex-start;
+  gap: 8px;
+  width: 100%;
+  padding: 8px 10px;
+  border: none;
+  background: none;
+  border-radius: 8px;
+  cursor: pointer;
+  text-align: left;
+  transition: background 0.12s;
+}
+
+.dropdown-item:hover {
+  background: var(--color-surface-soft);
+}
+
+.dropdown-item.selected {
+  background: var(--color-surface-soft);
+}
+
+.item-icon {
+  font-size: 15px;
+  color: var(--color-primary);
+  flex-shrink: 0;
+  margin-top: 1px;
+}
+
+.dropdown-item.selected .item-icon {
+  color: var(--color-primary);
+}
+
+.item-meta {
+  flex: 1;
+  min-width: 0;
+}
+
+.item-name {
+  font-size: 13px;
+  font-weight: 500;
+  color: var(--color-ink);
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.item-desc {
+  font-size: 11px;
+  color: var(--color-muted);
+  margin-top: 2px;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.dropdown-enter-active,
+.dropdown-leave-active {
+  transition: opacity 0.15s, transform 0.15s;
+}
+
+.dropdown-enter-from,
+.dropdown-leave-to {
+  opacity: 0;
+  transform: translateY(-4px);
+}
+</style>
diff --git a/app/components/agent/AgentWelcome.vue b/app/components/agent/AgentWelcome.vue
index 34a8cc7..01dcb1f 100644
--- a/app/components/agent/AgentWelcome.vue
+++ b/app/components/agent/AgentWelcome.vue
@@ -1,17 +1,22 @@
 <script setup lang="ts">
 const props = defineProps<{
   loggedIn: boolean;
+  agentName?: string;
+  agentDescription?: string;
 }>();
 
 const emit = defineEmits<{
   example: [content: string];
 }>();
 
+const displayName = computed(() => props.agentName?.trim() || "智能助手");
+const hasDescription = computed(() => !!props.agentDescription?.trim());
+
 const examples = [
-  "帮我写一个 Python 函数，计算斐波那契数列",
-  "解释一下什么是闭包，并给出一个 JavaScript 示例",
-  "帮我分析这段代码的性能瓶颈",
-  "如何用 SQL 查询去重并统计数量？",
+  "你好，能帮我做些什么？",
+  "给我介绍一下你自己",
+  "今天天气怎么样？",
+  "帮我写一封邮件",
 ];
 </script>
 
@@ -20,7 +25,8 @@ const examples = [
     <div class="welcome-icon">
       <Icon name="lucide:sparkles" />
     </div>
-    <h1 class="welcome-title">有什么可以帮你的？</h1>
+    <h1 class="welcome-title">{{ displayName }}</h1>
+    <p v-if="hasDescription" class="welcome-agent-desc">{{ agentDescription }}</p>
     <p class="welcome-subtitle">
       {{ loggedIn ? "选择模型，开始对话" : "无需登录即可体验，登录后可保存对话记录" }}
     </p>
@@ -71,6 +77,14 @@ const examples = [
   letter-spacing: -0.5px;
 }
 
+.welcome-agent-desc {
+  font-size: 14px;
+  color: var(--color-muted);
+  margin: 0 0 8px;
+  max-width: 560px;
+  line-height: 1.5;
+}
+
 .welcome-subtitle {
   font-size: 15px;
   color: var(--color-muted);
diff --git a/app/pages/chat/[agentSlug]/index.vue b/app/pages/chat/[agentSlug]/index.vue
index ce6bd03..94ea3ca 100644
--- a/app/pages/chat/[agentSlug]/index.vue
+++ b/app/pages/chat/[agentSlug]/index.vue
@@ -21,6 +21,8 @@ const mobileSidebarOpen = ref(false);
 const showPromptModal = ref(false);
 const showDocumentDrawer = ref(false);
 const agentSystemPrompt = ref("");
+const agentName = ref("");
+const agentDescription = ref("");
 const agentTools = ref<{ slug: string; name: string; type: string; description: string }[]>([]);
 const systemPromptText = computed(() =>
   sessions.currentSession.value?.systemPrompt?.trim() || agentSystemPrompt.value || "",
@@ -149,10 +151,12 @@ async function loadUserConfig() {
 
 async function loadSystemPrompt() {
   try {
-    const res = await $fetch<{ code: number; data: { systemPrompt?: string; tools?: { id: string; name: string; slug: string; type: string; needsApproval: number }[] } }>(
+    const res = await $fetch<{ code: number; data: { name?: string; description?: string; systemPrompt?: string; tools?: { id: string; name: string; slug: string; type: string; needsApproval: number }[] } }>(
       `/api/agents/${agentSlug.value}/info`,
     );
     agentSystemPrompt.value = res.data?.systemPrompt ?? "";
+    agentName.value = res.data?.name ?? "";
+    agentDescription.value = res.data?.description ?? "";
     agentTools.value = (res.data?.tools ?? []).map((t) => ({
       slug: t.slug,
       name: t.name,
@@ -161,6 +165,8 @@ async function loadSystemPrompt() {
     }));
   } catch {
     agentSystemPrompt.value = "";
+    agentName.value = "";
+    agentDescription.value = "";
     agentTools.value = [];
   }
 }
@@ -259,6 +265,12 @@ function handleExample(content: string) {
   handleSend(content);
 }
 
+function handleSwitchAgent(slug: string) {
+  chat.forceStop();
+  if (isMobile) mobileSidebarOpen.value = false;
+  navigateTo(`/chat/${slug}`);
+}
+
 function handleLogin() {
   navigateTo("/auth/login");
 }
@@ -282,6 +294,7 @@ onMounted(async () => {
     :user="auth.user.value"
     :collapsed="isMobile ? !mobileSidebarOpen : sidebarCollapsed"
     :mobile="isMobile"
+    :current-agent-slug="agentSlug"
     @new-session="handleNewSession"
     @select="sessions.selectSession($event); if (isMobile) mobileSidebarOpen = false"
     @rename="sessions.renameSession"
@@ -291,6 +304,7 @@ onMounted(async () => {
     @toggle="isMobile ? (mobileSidebarOpen = !mobileSidebarOpen) : (sidebarCollapsed = !sidebarCollapsed)"
     @close="mobileSidebarOpen = false"
     @show-documents="showDocumentDrawer = true"
+    @switch-agent="handleSwitchAgent"
   />
 
   <AgentChatArea
@@ -308,6 +322,8 @@ onMounted(async () => {
     :system-prompt="systemPromptText"
     :session-id="sessions.currentSessionId.value"
     :agent-tools="agentTools"
+    :agent-name="agentName"
+    :agent-description="agentDescription"
     @send="handleSend"
     @stop="chat.stopGeneration()"
     @update:model-id="currentModelId = $event"
diff --git a/packages/drizzle-pkg/db.sqlite b/packages/drizzle-pkg/db.sqlite
index 1cc6767..0b85290 100644
Binary files a/packages/drizzle-pkg/db.sqlite and b/packages/drizzle-pkg/db.sqlite differ