diff --git a/backend/modules/aiagent/service/AgentChatService.php b/backend/modules/aiagent/service/AgentChatService.php
index 5aa4ab0ca..25ee2a445 100644
--- a/backend/modules/aiagent/service/AgentChatService.php
+++ b/backend/modules/aiagent/service/AgentChatService.php
@@ -47,8 +47,7 @@ class AgentChatService
      */
     public function options(): array
     {
-        $modelService = app()->make(AiModelServices::class);
-        $models = $modelService->getAvailableModels();
+        $models = app()->make(AiModelServices::class)->getAvailableModels();
         // 系统默认唯一：存在登记的默认模型时，一号通项退化为普通选项，不再标记默认
         $hasRegisteredDefault = (bool) array_filter($models, fn(array $model) => (int)$model['is_default'] === 1);
         array_unshift($models, [
@@ -63,8 +62,6 @@ class AgentChatService
         ]);
         return [
             'models'        => $models,
-            // 内置一号通凭证状态：前端据此识别「仅剩一号通且未配置」场景，在对话框直接引导去配置模型
-            'yihaotong_configured' => $modelService->isYihaotongConfigured(),
             'mcp_available' => $this->mcp->available(),
             'mcp_servers'   => $this->mcp->serverOptions(),
             'skills'        => array_values(array_filter(
@@ -426,12 +423,63 @@ class AgentChatService
         $this->agents->expirePendingConfirms($conversationId);
 
         $send(['event' => 'start', 'conversation_id' => $conversationId]);
-        $context = $this->prepareContext($conversationId, $serverIds, $skillKeys, $modelId, [], [], $adminId);
-        $this->streamLoop($conversationId, $context, $send, [
-            'model_id' => $modelId,
-            'server_ids' => $serverIds,
-            'skill_keys' => $skillKeys,
-        ]);
+        try {
+            $context = $this->prepareContext($conversationId, $serverIds, $skillKeys, $modelId, [], [], $adminId);
+            $this->streamLoop($conversationId, $context, $send, [
+                'model_id' => $modelId,
+                'server_ids' => $serverIds,
+                'skill_keys' => $skillKeys,
+            ]);
+        } catch (\Throwable $e) {
+            // 模型解析/调用失败（未配置、停用、一号通凭证缺失、上游密钥无效等）：
+            // 以普通对话消息输出配置指引并落库，前端按正常回复渲染，不再依赖错误弹窗
+            $this->sendModelGuide($conversationId, $send, $e);
+        }
+    }
+
+    /**
+     * 模型不可用兜底：以普通 assistant 消息输出配置指引（先落库再流式推送），前端按正常回复渲染。
+     *
+     * 覆盖模型未配置/停用、一号通凭证缺失、上游接口报错（如密钥无效）等场景；
+     * 消息落库后在历史会话中同样可见，替代原先一闪而过的错误弹窗。
+     * @param int $conversationId 会话 ID
+     * @param callable $send SSE 事件推送回调
+     * @param \Throwable $e 失败异常
+     */
+    private function sendModelGuide(int $conversationId, callable $send, \Throwable $e): void
+    {
+        // 与流式错误白名单同一口径：仅 RuntimeException 的消息可直出，其余异常统一脱敏文案
+        $error = $e instanceof \RuntimeException ? $e->getMessage() : '服务异常，请稍后重试';
+        $content = $this->buildModelGuide($error);
+        $this->agents->addMessage($conversationId, 'assistant', $content);
+        $send(['event' => 'delta', 'text' => $content]);
+        $send(['event' => 'done', 'tool_calls' => [], 'skills' => []]);
+    }
+
+    /**
+     * 按错误内容归类生成配置指引文案（含后台配置页地址），以 Markdown 随对话下发
+     * @param string $error 脱敏后的错误消息
+     * @return string
+     */
+    private function buildModelGuide(string $error): string
+    {
+        // 一号通凭证缺失或一号通接口报错：引导完成一号通配置，或改用第三方模型
+        if (str_contains($error, '一号通')) {
+            return "AI 模型暂不可用：{$error}\n\n"
+                . "可选择以下任一方式配置后再试：\n"
+                . "- 使用一号通 AI：前往[系统设置 → 一号通账户](/admin/setting/yihaotong/index)完成一号通登录；\n"
+                . '- 使用第三方模型：前往[第三方模型配置](/admin/plugin/mcp/config)完成配置。';
+        }
+        // 第三方模型上游报错（如 Invalid API Key）：引导检查登记模型的密钥与地址配置
+        if (str_contains($error, 'AI接口错误')) {
+            return "AI 模型调用失败：{$error}\n\n"
+                . '请前往[系统设置 → 模型管理](/admin/setting/ai_model/index)检查所选模型的接口地址与密钥配置，或更换其他可用模型后重试。';
+        }
+        // 模型不存在/停用等（错误文案本身已指向模型管理）：补充具体配置页地址
+        if (str_contains($error, '模型管理')) {
+            return "{$error}\n\n模型管理入口：[系统设置 → 模型管理](/admin/setting/ai_model/index)。";
+        }
+        return $error;
     }
 
     /**
@@ -886,15 +934,20 @@ class AgentChatService
         $this->agents->updateConfirmStatus($messageId, $action === 'approve' ? 'approved' : 'rejected');
         // 以确认时快照重建上下文（连接器/Skill/模型），执行参数以快照为准，不重新让模型生成；
         // 确认前已加载的 Skill 一并预载，模型无需重复调用加载工具
-        $context = $this->prepareContext(
-            $conversationId,
-            array_map('intval', (array)($payload['server_ids'] ?? [])),
-            array_map('strval', (array)($payload['skill_keys'] ?? [])),
-            (int)($payload['model_id'] ?? 0),
-            array_map('strval', (array)($payload['skill_loaded'] ?? [])),
-            [],
-            $adminId
-        );
+        try {
+            $context = $this->prepareContext(
+                $conversationId,
+                array_map('intval', (array)($payload['server_ids'] ?? [])),
+                array_map('strval', (array)($payload['skill_keys'] ?? [])),
+                (int)($payload['model_id'] ?? 0),
+                array_map('strval', (array)($payload['skill_loaded'] ?? [])),
+                [],
+                $adminId
+            );
+        } catch (\Throwable $e) {
+            $this->sendModelGuide($conversationId, $send, $e);
+            return;
+        }
 
         if ($interaction === 'ask_user') {
             $toolResult = $action === 'approve'
@@ -909,15 +962,19 @@ class AgentChatService
             );
             $send(['event' => 'tool', 'name' => $toolName, 'arguments' => $arguments, 'result' => $toolResult]);
             $context['workingMessage'] .= $this->buildToolResultContext($toolName, $toolResult);
-            $this->streamLoop($conversationId, $context, $send, [
-                'model_id' => (int)($payload['model_id'] ?? 0),
-                'server_ids' => (array)($payload['server_ids'] ?? []),
-                'skill_keys' => (array)($payload['skill_keys'] ?? []),
-            ], $action === 'approve' ? '用户已作答，正在继续处理' : '用户已跳过该问题，正在继续处理', [[
-                'name' => $toolName,
-                'arguments' => $arguments,
-                'result' => $toolResult,
-            ]]);
+            try {
+                $this->streamLoop($conversationId, $context, $send, [
+                    'model_id' => (int)($payload['model_id'] ?? 0),
+                    'server_ids' => (array)($payload['server_ids'] ?? []),
+                    'skill_keys' => (array)($payload['skill_keys'] ?? []),
+                ], $action === 'approve' ? '用户已作答，正在继续处理' : '用户已跳过该问题，正在继续处理', [[
+                    'name' => $toolName,
+                    'arguments' => $arguments,
+                    'result' => $toolResult,
+                ]]);
+            } catch (\Throwable $e) {
+                $this->sendModelGuide($conversationId, $send, $e);
+            }
             return;
         }
 
@@ -943,15 +1000,19 @@ class AgentChatService
         );
         $send(['event' => 'tool', 'name' => $toolName, 'arguments' => $arguments, 'result' => $toolResult]);
         $context['workingMessage'] .= $this->buildToolResultContext($toolName, $toolResult);
-        $this->streamLoop($conversationId, $context, $send, [
-            'model_id' => (int)($payload['model_id'] ?? 0),
-            'server_ids' => (array)($payload['server_ids'] ?? []),
-            'skill_keys' => (array)($payload['skill_keys'] ?? []),
-        ], '用户已确认，正在执行操作', [[
-            'name' => $toolName,
-            'arguments' => $arguments,
-            'result' => $toolResult,
-        ]]);
+        try {
+            $this->streamLoop($conversationId, $context, $send, [
+                'model_id' => (int)($payload['model_id'] ?? 0),
+                'server_ids' => (array)($payload['server_ids'] ?? []),
+                'skill_keys' => (array)($payload['skill_keys'] ?? []),
+            ], '用户已确认，正在执行操作', [[
+                'name' => $toolName,
+                'arguments' => $arguments,
+                'result' => $toolResult,
+            ]]);
+        } catch (\Throwable $e) {
+            $this->sendModelGuide($conversationId, $send, $e);
+        }
     }
 
     /**
diff --git a/frontend/admin/src/pages/plugin/aiagent/pages/index.vue b/frontend/admin/src/pages/plugin/aiagent/pages/index.vue
index c1d67377a..4bd742abd 100644
--- a/frontend/admin/src/pages/plugin/aiagent/pages/index.vue
+++ b/frontend/admin/src/pages/plugin/aiagent/pages/index.vue
@@ -29,19 +29,10 @@
           </div>
         </div>
 
-        <div ref="messageBox" class="message-list">
+        <div ref="messageBox" class="message-list" @click="onMessageBoxClick">
           <div v-if="!messages.length" class="empty-chat">
-            <template v-if="modelMissing">
-              <div class="empty-title">AI 模型尚未配置</div>
-              <div class="empty-tip">还没有可用的 AI 模型，请先完成模型配置再开始对话</div>
-              <el-button type="primary" class="empty-guide-btn" v-db-click @click="openManage('model')"
-                >去配置模型</el-button
-              >
-            </template>
-            <template v-else>
-              <div class="empty-title">今天帮你做些什么？</div>
-              <div class="empty-tip">点击输入框右下角模型名称可切换 AI 模型</div>
-            </template>
+            <div class="empty-title">今天帮你做些什么？</div>
+            <div class="empty-tip">点击输入框右下角模型名称可切换 AI 模型</div>
           </div>
 
           <template v-for="(message, index) in messages">
@@ -78,15 +69,6 @@
               @resolve="resolveConfirm"
             />
 
-            <!-- 模型配置引导卡片：模型未配置/停用时在对话区直接提示去向，替代一闪而过的 toast -->
-            <div v-else-if="message.modelGuide" :key="'g' + index" class="model-guide">
-              <div class="model-guide-title">AI 模型不可用</div>
-              <div class="model-guide-text">{{ message.text || '当前没有可用的 AI 模型，请先完成模型配置后再开始对话' }}</div>
-              <el-button type="primary" size="small" v-db-click @click="openModelGuide(message)">{{
-                message.target === 'yihaotong' ? '去配置一号通' : '去配置模型'
-              }}</el-button>
-            </div>
-
             <!-- AI 回复：通栏排版 -->
             <div v-else :key="'a' + index" class="assistant-row">
               <!-- 系统过程（深度思考）：思维链、调用过的 Skill 与工具痕迹，默认折叠，展开才可见 -->
@@ -218,15 +200,6 @@ const modelId = ref(0);
 const serverIds = ref([]);
 const skillKeys = ref([]);
 const options = ref({ models: [] });
-/** options 是否已加载完成（未加载完不判定模型缺失，避免空态引导闪现） */
-const optionsLoaded = ref(false);
-/** 完全没有可用模型：无启用的登记模型，且内置一号通未配置凭证 */
-const modelMissing = computed(() => {
-  if (!optionsLoaded.value) return false;
-  const models = options.value.models || [];
-  const hasCustom = models.some((model) => model.id > 0);
-  return !hasCustom && !options.value.yihaotong_configured;
-});
 
 /** 快捷场景标签：点击仅回填输入框（icon 为全局注册的 @element-plus/icons-vue 组件名） */
 const topics = [
@@ -260,7 +233,6 @@ onMounted(() => {
 function loadOptions(applyDefault = false) {
   aiAgentOptionsApi().then((res) => {
     options.value = { ...options.value, ...(res.data || {}) };
-    optionsLoaded.value = true;
     // 首次加载时选中"默认模型"（is_default 全局唯一：登记默认或一号通）
     if (applyDefault) {
       const def = (options.value.models || []).find((model) => model.is_default === 1);
@@ -300,9 +272,9 @@ function newConversation() {
 function selectConversation(item, force = false) {
   // 从管理遮盖层点击会话记录时，关闭遮盖层展示对话内容
   activeManage.value = '';
-  if (!force && conversationId.value === item.id) return Promise.resolve();
+  if (!force && conversationId.value === item.id) return;
   conversationId.value = item.id;
-  return aiAgentMessagesApi(item.id).then((res) => {
+  aiAgentMessagesApi(item.id).then((res) => {
     if (conversationId.value !== item.id) return;
     // 过滤中间过程消息（tool 角色与带 tool_name 的 assistant 工具调用记录），仅展示问答内容与交互卡片
     messages.value = (res.data || [])
@@ -379,11 +351,6 @@ function sendMessage(question) {
   const fromInput = typeof question !== 'string';
   const content = (fromInput ? chatInput.value : question).trim();
   if (!content || chatting.value) return;
-  // 模型未配置：不发起请求，直接在对话区给出配置引导（输入内容保留）
-  if (modelMissing.value) {
-    pushModelGuide();
-    return;
-  }
   messages.value.push({ role: 'user', content });
   if (fromInput) {
     chatInput.value = '';
@@ -418,11 +385,6 @@ function startStream(content) {
       streamController = null;
       if (e?.name === 'AbortError') {
         finishAborted(reply);
-      } else if (isModelConfigError(e?.message)) {
-        // 模型未配置/停用：移除空占位，在对话区插入配置引导卡片（用户消息已落库，无需回读）
-        removeReply(reply);
-        pushModelGuide(e?.message || '');
-        loadConversations();
       } else {
         ElMessage.error(e.message || '对话失败');
         finishReply(reply);
@@ -448,39 +410,6 @@ function finishAborted(reply) {
   finishReply(reply);
 }
 
-/** 是否为模型配置类错误：后端固定文案均指向「模型管理」或一号通凭证缺失 */
-function isModelConfigError(msg) {
-  return typeof msg === 'string' && (msg.includes('模型管理') || msg.includes('一号通凭证'));
-}
-
-/** 在对话区插入模型配置引导卡片（已有引导卡不重复插入），text 为后端错误说明 */
-function pushModelGuide(text = '') {
-  const list = messages.value;
-  if (!list.some((message) => message.modelGuide)) {
-    list.push({
-      role: 'assistant',
-      modelGuide: true,
-      text,
-      // 一号通凭证缺失引导去「一号通账户」页，其余模型问题统一去「模型管理」页
-      target: text.includes('一号通凭证') ? 'yihaotong' : 'model',
-    });
-  }
-  scrollToBottom();
-}
-
-/** 移除流式回复占位消息并复位对话状态（引导卡场景占位无内容，不适用 finishReply 的移除条件） */
-function removeReply(reply) {
-  const list = messages.value;
-  const index = list.indexOf(reply);
-  if (index > -1) list.splice(index, 1);
-  chatting.value = false;
-}
-
-/** 引导卡跳转：模型管理 / 一号通账户（均为系统设置内置页面） */
-function openModelGuide(message) {
-  router.push(setting.routePre + (message.target === 'yihaotong' ? '/setting/yihaotong/index' : '/setting/ai_model/index'));
-}
-
 /** 是否为最后一条 AI 回复（重新生成仅对最后一条回复开放） */
 function isLastReply(message) {
   const list = messages.value;
@@ -538,14 +467,6 @@ function resolveConfirm(message, action, extra = {}) {
       if (e?.name === 'AbortError') {
         // 手动终止：卡片决定已提交，保持当前状态防止重复执行，仅停止后续输出
         finishAborted(reply);
-      } else if (isModelConfigError(e?.message)) {
-        // 模型未配置/停用：移除空占位，回读服务端记录（工具执行可能已落库）后插入配置引导卡片
-        removeReply(reply);
-        const targetId = conversationId.value;
-        Promise.resolve(targetId ? selectConversation({ id: targetId }, true) : null).then(() => {
-          if (conversationId.value === targetId) pushModelGuide(e?.message || '');
-        });
-        loadConversations();
       } else {
         ElMessage.error(e.message || '操作失败');
         finishReply(reply);
@@ -649,6 +570,19 @@ function scrollToBottom() {
     if (box) box.scrollTop = box.scrollHeight;
   });
 }
+
+/**
+ * 消息内链接点击委托：AI 回复 Markdown 渲染的站内链接（/admin 开头）转路由跳转，
+ * 避免原生 <a> 导航整页刷新；外链与无 href 的锚点保持默认行为
+ */
+function onMessageBoxClick(e) {
+  const anchor = e.target.closest('a');
+  if (!anchor) return;
+  const href = anchor.getAttribute('href') || '';
+  if (!href.startsWith('/admin')) return;
+  e.preventDefault();
+  router.push(href);
+}
 </script>
 
 <style scoped lang="scss">
@@ -738,29 +672,6 @@ function scrollToBottom() {
   color: #a8abb2;
   font-size: 13px;
 }
-.empty-guide-btn {
-  margin-top: 20px;
-}
-/* 模型配置引导卡片：对话区内的居中提示条 */
-.model-guide {
-  margin-bottom: 30px;
-  padding: 16px 20px;
-  text-align: center;
-  background: var(--prev-bg-color);
-  border: 1px solid var(--prev-border-color-lighter);
-  border-radius: 6px;
-}
-.model-guide-title {
-  color: var(--prev-color-text-regular);
-  font-size: 14px;
-  font-weight: 600;
-}
-.model-guide-text {
-  margin: 6px 0 12px;
-  color: var(--prev-color-text-secondary);
-  font-size: 13px;
-  line-height: 1.6;
-}
 /* 用户消息：右侧浅灰气泡 */
 .user-row {
   display: flex;