diff --git a/astrbot/core/astr_main_agent.py b/astrbot/core/astr_main_agent.py
index fd1a9aeb8c..e522ce5453 100644
--- a/astrbot/core/astr_main_agent.py
+++ b/astrbot/core/astr_main_agent.py
@@ -114,6 +114,8 @@
 )
 from astrbot.core.utils.string_utils import normalize_and_dedupe_strings
 
+LLM_ERROR_MESSAGE_EXTRA_KEY = "_llm_error_message"
+
 
 @dataclass(slots=True)
 class MainAgentBuildConfig:
@@ -183,6 +185,10 @@ class MainAgentBuildResult:
     reset_coro: Coroutine | None = None
 
 
+def _set_llm_error_message(event: AstrMessageEvent, message: str) -> None:
+    event.set_extra(LLM_ERROR_MESSAGE_EXTRA_KEY, message)
+
+
 def _select_provider(
     event: AstrMessageEvent, plugin_context: Context
 ) -> Provider | None:
@@ -190,18 +196,28 @@ def _select_provider(
     sel_provider = event.get_extra("selected_provider")
     if sel_provider and isinstance(sel_provider, str):
         provider = plugin_context.get_provider_by_id(sel_provider)
-        if not provider:
+        if provider is None:
             logger.error("未找到指定的提供商: %s。", sel_provider)
+            _set_llm_error_message(
+                event,
+                f"LLM 请求失败：未找到指定的提供商 `{sel_provider}`。请检查提供商配置或重新选择可用模型。",
+            )
+            return None
         if not isinstance(provider, Provider):
             logger.error(
                 "选择的提供商类型无效(%s)，跳过 LLM 请求处理。", type(provider)
             )
+            _set_llm_error_message(
+                event,
+                f"LLM 请求失败：选择的提供商类型无效（{type(provider).__name__}），已跳过本次请求。",
+            )
             return None
         return provider
     try:
         return plugin_context.get_using_provider(umo=event.unified_msg_origin)
     except ValueError as exc:
         logger.error("Error occurred while selecting provider: %s", exc)
+        _set_llm_error_message(event, f"LLM 请求失败：{exc}")
         return None
 
 
@@ -1192,6 +1208,11 @@ async def build_main_agent(
     provider = provider or _select_provider(event, plugin_context)
     if provider is None:
         logger.info("未找到任何对话模型（提供商），跳过 LLM 请求处理。")
+        if not event.get_extra(LLM_ERROR_MESSAGE_EXTRA_KEY):
+            _set_llm_error_message(
+                event,
+                "LLM 请求失败：未找到任何可用的对话模型（提供商）。请先在 WebUI 中配置并启用可用模型。",
+            )
         return None
 
     if req is None:
diff --git a/astrbot/core/pipeline/process_stage/method/agent_sub_stages/internal.py b/astrbot/core/pipeline/process_stage/method/agent_sub_stages/internal.py
index fee641c192..2c200ec262 100644
--- a/astrbot/core/pipeline/process_stage/method/agent_sub_stages/internal.py
+++ b/astrbot/core/pipeline/process_stage/method/agent_sub_stages/internal.py
@@ -14,6 +14,7 @@
 )
 from astrbot.core.agent.response import AgentStats
 from astrbot.core.astr_main_agent import (
+    LLM_ERROR_MESSAGE_EXTRA_KEY,
     MainAgentBuildConfig,
     MainAgentBuildResult,
     build_main_agent,
@@ -151,6 +152,11 @@ async def initialize(self, ctx: PipelineContext) -> None:
             max_quoted_fallback_images=settings.get("max_quoted_fallback_images", 20),
         )
 
+    async def _send_llm_error_message(
+        self, event: AstrMessageEvent, message: object
+    ) -> None:
+        await event.send(MessageChain().message(str(message)))
+
     async def process(
         self, event: AstrMessageEvent, provider_wake_prefix: str
     ) -> AsyncGenerator[None, None]:
@@ -219,6 +225,13 @@ async def process(
                     )
 
                     if build_result is None:
+                        if llm_error_message := event.get_extra(
+                            LLM_ERROR_MESSAGE_EXTRA_KEY
+                        ):
+                            await self._send_llm_error_message(
+                                event,
+                                llm_error_message,
+                            )
                         return
 
                     agent_runner = build_result.agent_runner
@@ -229,10 +242,12 @@ async def process(
                     api_base = provider.provider_config.get("api_base", "")
                     for host in decoded_blocked:
                         if host in api_base:
-                            logger.error(
-                                "Provider API base %s is blocked due to security reasons. Please use another ai provider.",
-                                api_base,
+                            error_message = (
+                                f"LLM 请求失败：Provider API base `{api_base}` "
+                                "因安全原因被拦截，请更换可用的 AI 提供商。"
                             )
+                            logger.error(error_message)
+                            await self._send_llm_error_message(event, error_message)
                             return
 
                     stream_to_general = (
diff --git a/dashboard/src/components/chat/Chat.vue b/dashboard/src/components/chat/Chat.vue
index e5cae3da3b..7e88480f1c 100644
--- a/dashboard/src/components/chat/Chat.vue
+++ b/dashboard/src/components/chat/Chat.vue
@@ -841,6 +841,7 @@ async function startNewChat() {
   replyTarget.value = null;
   newChat();
   closeMobileSidebar();
+  await focusChatInput();
 }
 
 function openCreateProjectDialog() {
@@ -975,6 +976,7 @@ async function selectSession(sessionId: string, pushRoute = true) {
   }
   scrollToBottom();
   closeMobileSidebar();
+  await focusChatInput();
 }
 
 async function sendCurrentMessage() {
@@ -1032,6 +1034,7 @@ async function sendCurrentMessage() {
     console.error("Failed to send message:", error);
   } finally {
     sending.value = false;
+    await focusChatInput();
   }
 }
 
@@ -1326,6 +1329,13 @@ function scrollToBottom() {
   });
 }
 
+async function focusChatInput() {
+  await nextTick();
+  window.requestAnimationFrame(() => {
+    inputRef.value?.focusInput();
+  });
+}
+
 async function stopCurrentSession() {
   if (!currSessionId.value) return;
   try {
@@ -1487,6 +1497,9 @@ function toggleTheme() {
   align-items: center;
   gap: 8px;
   padding: 8px 12px;
+  padding-right: 68px;
+  position: relative;
+  box-sizing: border-box;
   cursor: pointer;
   text-align: left;
 }
@@ -1511,15 +1524,24 @@ function toggleTheme() {
 }
 
 .session-actions {
-  display: none;
+  display: flex;
   align-items: center;
   gap: 2px;
   flex-shrink: 0;
+  opacity: 0;
+  pointer-events: none;
+  position: absolute;
+  right: 8px;
+  top: 50%;
+  transform: translateY(-50%);
+  visibility: hidden;
 }
 
 .session-item:hover .session-actions,
 .session-item:focus-within .session-actions {
-  display: flex;
+  opacity: 1;
+  pointer-events: auto;
+  visibility: visible;
 }
 
 .session-action-btn {
diff --git a/dashboard/src/components/chat/ChatInput.vue b/dashboard/src/components/chat/ChatInput.vue
index c966d13777..e4657c6f6c 100644
--- a/dashboard/src/components/chat/ChatInput.vue
+++ b/dashboard/src/components/chat/ChatInput.vue
@@ -108,14 +108,23 @@
         </div>
       </transition>
 
+      <CommandSuggestion
+        :visible="showCommandSuggestion"
+        :commands="filteredCommands"
+        :selected-index="selectedCommandIndex"
+        :is-dark="isDark"
+        @select="handleCommandSelect"
+        @update-selected-index="selectedCommandIndex = $event"
+      />
       <textarea
         ref="inputField"
         v-model="localPrompt"
         @keydown="handleKeyDown"
+        @input="handleInput"
         @compositionstart="handleCompositionStart"
         @compositionend="handleCompositionEnd"
         @compositioncancel="handleCompositionEnd"
-        @blur="clearCompositionState()"
+        @blur="handleBlur"
         :disabled="disabled"
         placeholder="Ask AstrBot..."
         class="chat-textarea"
@@ -312,10 +321,14 @@ import { useDisplay } from "vuetify";
 import { useModuleI18n } from "@/i18n/composables";
 import { useCustomizerStore } from "@/stores/customizer";
 import { isComposingEnter } from "@/utils/imeInput.mjs";
+import axios from "axios";
+import type { CommandItem } from "@/components/extension/componentPanel/types";
 import ConfigSelector from "./ConfigSelector.vue";
 import ProviderModelMenu from "./ProviderModelMenu.vue";
 import StyledMenu from "@/components/shared/StyledMenu.vue";
+import CommandSuggestion from "./CommandSuggestion.vue";
 import type { Session } from "@/composables/useSessions";
+import type { SuggestionCommand } from "./CommandSuggestion.vue";
 
 interface StagedFileInfo {
   attachment_id: string;
@@ -388,6 +401,105 @@ const isComposing = ref(false);
 const lastCompositionEndAt = ref<number | null>(null);
 let dragLeaveTimeout: number | null = null;
 
+// 命令提示相关状态
+const allCommands = ref<CommandItem[]>([]);
+const showCommandSuggestion = ref(false);
+const selectedCommandIndex = ref(0);
+const commandSuggestionLoading = ref(false);
+
+function normalizeCommandSearchText(value: string) {
+  return value.trim().replace(/^\/+/, "").toLowerCase();
+}
+
+/** 从所有指令中展平获取启用的普通指令和子指令 */
+const enabledCommands = computed(() => {
+  const result: SuggestionCommand[] = [];
+  const seen = new Set<string>();
+
+  function addCommand(cmd: CommandItem) {
+    if (!cmd.enabled) return;
+    if (cmd.type === "group") {
+      // 指令组本身不加入，但其子指令加入
+      cmd.sub_commands?.forEach(addCommand);
+      return;
+    }
+    // 统一添加 / 前缀（子命令的 effective_command 如 "music play" 需要变成 "/music play"）
+    const displayCmd = cmd.effective_command.startsWith("/")
+      ? cmd.effective_command
+      : `/${cmd.effective_command}`;
+    if (!seen.has(displayCmd)) {
+      seen.add(displayCmd);
+      result.push({
+        handler_full_name: cmd.handler_full_name,
+        effective_command: displayCmd,
+        description: cmd.description,
+        plugin_display_name: cmd.plugin_display_name,
+        enabled: cmd.enabled,
+        reserved: cmd.reserved,
+      });
+    }
+    // 同时加入别名（别名也需要加上 / 前缀）
+    cmd.aliases?.forEach((alias) => {
+      const aliasBase = cmd.parent_signature
+        ? `${cmd.parent_signature} ${alias}`
+        : alias;
+      const aliasKey = aliasBase.startsWith("/")
+        ? aliasBase
+        : `/${aliasBase}`;
+      if (!seen.has(aliasKey)) {
+        seen.add(aliasKey);
+        result.push({
+          handler_full_name: cmd.handler_full_name,
+          effective_command: aliasKey,
+          description: cmd.description,
+          plugin_display_name: cmd.plugin_display_name,
+          enabled: cmd.enabled,
+          reserved: cmd.reserved,
+        });
+      }
+    });
+  }
+
+  allCommands.value.forEach(addCommand);
+  return result;
+});
+
+function sortSystemPluginCommandsFirst(commands: SuggestionCommand[]) {
+  return [...commands].sort((a, b) => Number(b.reserved) - Number(a.reserved));
+}
+
+/** 根据当前输入过滤候选指令 */
+const filteredCommands = computed(() => {
+  const text = props.prompt;
+  if (!text || !text.startsWith("/")) return [];
+
+  const query = normalizeCommandSearchText(text);
+  if (!query) return sortSystemPluginCommandsFirst(enabledCommands.value);
+
+  const startsWithMatches: SuggestionCommand[] = [];
+  const containsMatches: SuggestionCommand[] = [];
+
+  for (const cmd of enabledCommands.value) {
+    const commandText = normalizeCommandSearchText(cmd.effective_command);
+    const pluginText = normalizeCommandSearchText(cmd.plugin_display_name || "");
+    const descriptionText = normalizeCommandSearchText(cmd.description || "");
+    const matchesCommand = commandText.includes(query);
+    const matchesMetadata =
+      pluginText.includes(query) || descriptionText.includes(query);
+
+    if (commandText.startsWith(query)) {
+      startsWithMatches.push(cmd);
+    } else if (matchesCommand || matchesMetadata) {
+      containsMatches.push(cmd);
+    }
+  }
+
+  return [
+    ...sortSystemPluginCommandsFirst(startsWithMatches),
+    ...sortSystemPluginCommandsFirst(containsMatches),
+  ];
+});
+
 const localPrompt = computed({
   get: () => props.prompt,
   set: (value) => emit("update:prompt", value),
@@ -504,6 +616,36 @@ watch(localPrompt, () => {
 });
 
 function handleKeyDown(e: KeyboardEvent) {
+  // 命令提示激活时，拦截方向键和 Enter/Esc
+  if (showCommandSuggestion.value && filteredCommands.value.length > 0) {
+    if (e.key === "ArrowDown") {
+      e.preventDefault();
+      selectedCommandIndex.value =
+        (selectedCommandIndex.value + 1) % filteredCommands.value.length;
+      return;
+    }
+    if (e.key === "ArrowUp") {
+      e.preventDefault();
+      selectedCommandIndex.value =
+        (selectedCommandIndex.value - 1 + filteredCommands.value.length) %
+        filteredCommands.value.length;
+      return;
+    }
+    if (e.key === "Enter") {
+      e.preventDefault();
+      const cmd = filteredCommands.value[selectedCommandIndex.value];
+      if (cmd) {
+        handleCommandSelect(cmd);
+      }
+      return;
+    }
+    if (e.key === "Escape") {
+      e.preventDefault();
+      showCommandSuggestion.value = false;
+      return;
+    }
+  }
+
   const isEnter = e.key === "Enter";
   if (!isEnter) {
     // Ctrl+B 录音
@@ -544,6 +686,53 @@ function handleKeyDown(e: KeyboardEvent) {
   }
 }
 
+/** 处理输入变化，控制命令提示显示 */
+function handleInput() {
+  const text = props.prompt;
+  if (text && text.startsWith("/") && !isComposing.value) {
+    showCommandSuggestion.value = filteredCommands.value.length > 0;
+    selectedCommandIndex.value = 0;
+  } else {
+    showCommandSuggestion.value = false;
+  }
+}
+
+/** 处理 blur 事件，延迟关闭命令提示以允许点击 */
+function handleBlur() {
+  clearCompositionState();
+  // 延迟关闭，避免点击候选项时面板已消失
+  setTimeout(() => {
+    showCommandSuggestion.value = false;
+  }, 200);
+}
+
+/** 选择命令，填入输入框 */
+function handleCommandSelect(cmd: SuggestionCommand) {
+  localPrompt.value = cmd.effective_command + " ";
+  showCommandSuggestion.value = false;
+  nextTick(() => {
+    inputField.value?.focus();
+    autoResize();
+  });
+}
+
+/** 获取指令列表 */
+async function fetchCommands() {
+  if (commandSuggestionLoading.value) return;
+  commandSuggestionLoading.value = true;
+  try {
+    const res = await axios.get("/api/commands");
+    if (res.data.status === "ok") {
+      allCommands.value = res.data.data.items || [];
+    }
+  } catch (err) {
+    // 静默失败，不影响聊天功能
+    console.warn("Failed to fetch commands for suggestion:", err);
+  } finally {
+    commandSuggestionLoading.value = false;
+  }
+}
+
 function handleCompositionStart() {
   isComposing.value = true;
   lastCompositionEndAt.value = null;
@@ -656,6 +845,8 @@ onMounted(() => {
     inputField.value.addEventListener("paste", handlePaste);
   }
   document.addEventListener("keyup", handleKeyUp);
+  // 预加载指令列表
+  fetchCommands();
 });
 
 onBeforeUnmount(() => {
diff --git a/dashboard/src/components/chat/CommandSuggestion.vue b/dashboard/src/components/chat/CommandSuggestion.vue
new file mode 100644
index 0000000000..02bfaaf537
--- /dev/null
+++ b/dashboard/src/components/chat/CommandSuggestion.vue
@@ -0,0 +1,205 @@
+<template>
+  <div
+    v-if="visible && filteredCommands.length > 0"
+    class="command-suggestion-panel"
+    :class="{ 'is-dark': isDark }"
+    :style="panelStyle"
+  >
+    <div class="command-suggestion-list">
+      <div
+        v-for="(cmd, index) in filteredCommands"
+        :key="`${cmd.handler_full_name}:${cmd.effective_command}`"
+        class="command-suggestion-item"
+        :class="{ active: index === selectedIndex }"
+        @click="handleSelect(index)"
+        @mouseenter="handleMouseEnter(index)"
+      >
+        <div class="command-suggestion-main">
+          <span class="command-name">{{ cmd.effective_command }}</span>
+          <span v-if="cmd.plugin_display_name" class="command-plugin">
+            {{ cmd.plugin_display_name }}
+          </span>
+        </div>
+        <div v-if="cmd.description" class="command-description">
+          {{ cmd.description }}
+        </div>
+      </div>
+    </div>
+    <div class="command-suggestion-hint">
+      <span>↑↓ {{ tm("commandSuggestion.navigate") }}</span>
+      <span>Enter {{ tm("commandSuggestion.select") }}</span>
+      <span>Esc {{ tm("commandSuggestion.close") }}</span>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { computed } from "vue";
+import { useModuleI18n } from "@/i18n/composables";
+
+export interface SuggestionCommand {
+  handler_full_name: string;
+  effective_command: string;
+  description: string;
+  plugin_display_name: string | null;
+  enabled: boolean;
+  reserved: boolean;
+}
+
+interface Props {
+  visible: boolean;
+  commands: SuggestionCommand[];
+  selectedIndex: number;
+  isDark: boolean;
+  caretPosition?: { left: number; top: number } | null;
+}
+
+const props = withDefaults(defineProps<Props>(), {
+  caretPosition: null,
+});
+
+const emit = defineEmits<{
+  select: [command: SuggestionCommand];
+  updateSelectedIndex: [index: number];
+}>();
+
+const { tm } = useModuleI18n("features/chat");
+
+const filteredCommands = computed(() => props.commands);
+
+const panelStyle = computed(() => {
+  if (props.caretPosition) {
+    return {
+      position: "absolute" as const,
+      left: `${props.caretPosition.left}px`,
+      bottom: `${props.caretPosition.top + 8}px`,
+      zIndex: 1000,
+    };
+  }
+  return {
+    position: "absolute" as const,
+    left: "18px",
+    bottom: "100%",
+    marginBottom: "8px",
+    zIndex: 1000,
+  };
+});
+
+function handleSelect(index: number) {
+  const cmd = props.commands[index];
+  if (cmd) {
+    emit("select", cmd);
+  }
+}
+
+function handleMouseEnter(index: number) {
+  emit("updateSelectedIndex", index);
+}
+</script>
+
+<style scoped>
+.command-suggestion-panel {
+  background: #ffffff;
+  border: 1px solid #e0e0e0;
+  border-radius: 12px;
+  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
+  max-height: 280px;
+  width: 320px;
+  display: flex;
+  flex-direction: column;
+  overflow: hidden;
+}
+
+.command-suggestion-panel.is-dark {
+  background: #1e1e1e;
+  border-color: #404040;
+  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
+}
+
+.command-suggestion-list {
+  overflow-y: auto;
+  flex: 1;
+  padding: 4px;
+}
+
+.command-suggestion-item {
+  padding: 8px 12px;
+  border-radius: 8px;
+  cursor: pointer;
+  transition: background-color 0.15s ease;
+}
+
+.command-suggestion-item:hover,
+.command-suggestion-item.active {
+  background-color: rgba(var(--v-theme-primary), 0.1);
+}
+
+.is-dark .command-suggestion-item:hover,
+.is-dark .command-suggestion-item.active {
+  background-color: rgba(255, 255, 255, 0.08);
+}
+
+.command-suggestion-main {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 8px;
+}
+
+.command-name {
+  font-family: "Fira Code", "Consolas", monospace;
+  font-size: 13px;
+  font-weight: 600;
+  color: rgb(var(--v-theme-primary));
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.command-plugin {
+  font-size: 11px;
+  color: #888;
+  background: rgba(0, 0, 0, 0.05);
+  padding: 1px 6px;
+  border-radius: 4px;
+  white-space: nowrap;
+  flex-shrink: 0;
+}
+
+.is-dark .command-plugin {
+  color: #aaa;
+  background: rgba(255, 255, 255, 0.08);
+}
+
+.command-description {
+  font-size: 12px;
+  color: #666;
+  margin-top: 2px;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.is-dark .command-description {
+  color: #999;
+}
+
+.command-suggestion-hint {
+  display: flex;
+  gap: 12px;
+  padding: 6px 12px;
+  border-top: 1px solid #f0f0f0;
+  font-size: 11px;
+  color: #aaa;
+  flex-shrink: 0;
+}
+
+.is-dark .command-suggestion-hint {
+  border-top-color: #333;
+  color: #666;
+}
+
+.command-suggestion-hint span {
+  white-space: nowrap;
+}
+</style>
diff --git a/dashboard/src/components/chat/StandaloneChat.vue b/dashboard/src/components/chat/StandaloneChat.vue
index f36e6cf2af..b754af50a5 100644
--- a/dashboard/src/components/chat/StandaloneChat.vue
+++ b/dashboard/src/components/chat/StandaloneChat.vue
@@ -317,6 +317,7 @@ async function sendCurrentMessage() {
   draft.value = "";
   clearStaged({ revokeUrls: false });
   scrollToBottom();
+  await focusChatInput();
 
   sendMessageStream({
     sessionId,
@@ -393,6 +394,13 @@ function scrollToBottom() {
   });
 }
 
+async function focusChatInput() {
+  await nextTick();
+  window.requestAnimationFrame(() => {
+    inputRef.value?.focusInput();
+  });
+}
+
 function messageRefs(message: ChatRecord) {
   const refs = messageContent(message).refs;
   if (refs && typeof refs === "object" && Array.isArray(refs.used)) {
diff --git a/dashboard/src/i18n/locales/en-US/features/chat.json b/dashboard/src/i18n/locales/en-US/features/chat.json
index a026532c51..fbe4fb31cd 100644
--- a/dashboard/src/i18n/locales/en-US/features/chat.json
+++ b/dashboard/src/i18n/locales/en-US/features/chat.json
@@ -162,6 +162,11 @@
       "failed": "Connection failed, please refresh the page"
     }
   },
+  "commandSuggestion": {
+    "navigate": "Navigate",
+    "select": "Select",
+    "close": "Close"
+  },
   "errors": {
     "sendMessageFailed": "Failed to send message, please try again",
     "createSessionFailed": "Failed to create session, please refresh the page"
diff --git a/dashboard/src/i18n/locales/ru-RU/features/chat.json b/dashboard/src/i18n/locales/ru-RU/features/chat.json
index b033cedaec..0837d9d551 100644
--- a/dashboard/src/i18n/locales/ru-RU/features/chat.json
+++ b/dashboard/src/i18n/locales/ru-RU/features/chat.json
@@ -162,6 +162,11 @@
       "failed": "Ошибка подключения, обновите страницу"
     }
   },
+  "commandSuggestion": {
+    "navigate": "Выбор",
+    "select": "Подтвердить",
+    "close": "Закрыть"
+  },
   "errors": {
     "sendMessageFailed": "Ошибка отправки сообщения, попробуйте еще раз",
     "createSessionFailed": "Ошибка создания сессии, обновите страницу"
diff --git a/dashboard/src/i18n/locales/zh-CN/features/chat.json b/dashboard/src/i18n/locales/zh-CN/features/chat.json
index 9ce2c6b81f..59cdaad979 100644
--- a/dashboard/src/i18n/locales/zh-CN/features/chat.json
+++ b/dashboard/src/i18n/locales/zh-CN/features/chat.json
@@ -162,6 +162,11 @@
       "failed": "连接失败，请刷新页面重试"
     }
   },
+  "commandSuggestion": {
+    "navigate": "选择",
+    "select": "确认",
+    "close": "关闭"
+  },
   "errors": {
     "sendMessageFailed": "发送消息失败，请重试",
     "createSessionFailed": "创建会话失败，请刷新页面重试"
diff --git a/tests/unit/test_astr_main_agent.py b/tests/unit/test_astr_main_agent.py
index bf6adb38ef..fdd06d34a0 100644
--- a/tests/unit/test_astr_main_agent.py
+++ b/tests/unit/test_astr_main_agent.py
@@ -184,6 +184,10 @@ def test_select_provider_not_found(self, mock_event, mock_context):
         result = module._select_provider(mock_event, mock_context)
 
         assert result is None
+        mock_event.set_extra.assert_called_with(
+            module.LLM_ERROR_MESSAGE_EXTRA_KEY,
+            "LLM 请求失败：未找到指定的提供商 `non-existent`。请检查提供商配置或重新选择可用模型。",
+        )
 
     def test_select_provider_invalid_type(self, mock_event, mock_context):
         """Test selecting provider when result is not a Provider instance."""
@@ -196,6 +200,10 @@ def test_select_provider_invalid_type(self, mock_event, mock_context):
         result = module._select_provider(mock_event, mock_context)
 
         assert result is None
+        mock_event.set_extra.assert_called_with(
+            module.LLM_ERROR_MESSAGE_EXTRA_KEY,
+            "LLM 请求失败：选择的提供商类型无效（str），已跳过本次请求。",
+        )
 
     def test_select_provider_fallback(self, mock_event, mock_context, mock_provider):
         """Test provider selection fallback to using provider."""
@@ -219,6 +227,10 @@ def test_select_provider_fallback_error(self, mock_event, mock_context):
         result = module._select_provider(mock_event, mock_context)
 
         assert result is None
+        mock_event.set_extra.assert_called_with(
+            module.LLM_ERROR_MESSAGE_EXTRA_KEY,
+            "LLM 请求失败：Test error",
+        )
 
 
 class TestGetSessionConv: