diff --git a/astrbot/core/agent/runners/tool_loop_agent_runner.py b/astrbot/core/agent/runners/tool_loop_agent_runner.py
index d6aed6dfa..8309e6674 100644
--- a/astrbot/core/agent/runners/tool_loop_agent_runner.py
+++ b/astrbot/core/agent/runners/tool_loop_agent_runner.py
@@ -91,6 +91,7 @@ async def reset(
         custom_token_counter: TokenCounter | None = None,
         custom_compressor: ContextCompressor | None = None,
         tool_schema_mode: str | None = "full",
+        fallback_providers: list[Provider] | None = None,
         **kwargs: T.Any,
     ) -> None:
         self.req = request
@@ -120,6 +121,17 @@ async def reset(
         self.context_manager = ContextManager(self.context_config)
 
         self.provider = provider
+        self.fallback_providers: list[Provider] = []
+        seen_provider_ids: set[str] = {str(provider.provider_config.get("id", ""))}
+        for fallback_provider in fallback_providers or []:
+            fallback_id = str(fallback_provider.provider_config.get("id", ""))
+            if fallback_provider is provider:
+                continue
+            if fallback_id and fallback_id in seen_provider_ids:
+                continue
+            self.fallback_providers.append(fallback_provider)
+            if fallback_id:
+                seen_provider_ids.add(fallback_id)
         self.final_llm_resp = None
         self._state = AgentState.IDLE
         self.tool_executor = tool_executor
@@ -166,16 +178,19 @@ async def reset(
         self.stats = AgentStats()
         self.stats.start_time = time.time()
 
-    async def _iter_llm_responses(self) -> T.AsyncGenerator[LLMResponse, None]:
+    async def _iter_llm_responses(
+        self, *, include_model: bool = True
+    ) -> T.AsyncGenerator[LLMResponse, None]:
         """Yields chunks *and* a final LLMResponse."""
         payload = {
             "contexts": self.run_context.messages,  # list[Message]
             "func_tool": self.req.func_tool,
-            "model": self.req.model,  # NOTE: in fact, this arg is None in most cases
             "session_id": self.req.session_id,
             "extra_user_content_parts": self.req.extra_user_content_parts,  # list[ContentPart]
         }
-
+        if include_model:
+            # For primary provider we keep explicit model selection if provided.
+            payload["model"] = self.req.model
         if self.streaming:
             stream = self.provider.text_chat_stream(**payload)
             async for resp in stream:  # type: ignore
@@ -183,6 +198,77 @@ async def _iter_llm_responses(self) -> T.AsyncGenerator[LLMResponse, None]:
         else:
             yield await self.provider.text_chat(**payload)
 
+    async def _iter_llm_responses_with_fallback(
+        self,
+    ) -> T.AsyncGenerator[LLMResponse, None]:
+        """Wrap _iter_llm_responses with provider fallback handling."""
+        candidates = [self.provider, *self.fallback_providers]
+        total_candidates = len(candidates)
+        last_exception: Exception | None = None
+        last_err_response: LLMResponse | None = None
+
+        for idx, candidate in enumerate(candidates):
+            candidate_id = candidate.provider_config.get("id", "<unknown>")
+            is_last_candidate = idx == total_candidates - 1
+            if idx > 0:
+                logger.warning(
+                    "Switched from %s to fallback chat provider: %s",
+                    self.provider.provider_config.get("id", "<unknown>"),
+                    candidate_id,
+                )
+            self.provider = candidate
+            has_stream_output = False
+            try:
+                async for resp in self._iter_llm_responses(include_model=idx == 0):
+                    if resp.is_chunk:
+                        has_stream_output = True
+                        yield resp
+                        continue
+
+                    if (
+                        resp.role == "err"
+                        and not has_stream_output
+                        and (not is_last_candidate)
+                    ):
+                        last_err_response = resp
+                        logger.warning(
+                            "Chat Model %s returns error response, trying fallback to next provider.",
+                            candidate_id,
+                        )
+                        break
+
+                    yield resp
+                    return
+
+                if has_stream_output:
+                    return
+            except Exception as exc:  # noqa: BLE001
+                last_exception = exc
+                logger.warning(
+                    "Chat Model %s request error: %s",
+                    candidate_id,
+                    exc,
+                    exc_info=True,
+                )
+                continue
+
+        if last_err_response:
+            yield last_err_response
+            return
+        if last_exception:
+            yield LLMResponse(
+                role="err",
+                completion_text=(
+                    "All chat models failed: "
+                    f"{type(last_exception).__name__}: {last_exception}"
+                ),
+            )
+            return
+        yield LLMResponse(
+            role="err",
+            completion_text="All available chat models are unavailable.",
+        )
+
     def _simple_print_message_role(self, tag: str = ""):
         roles = []
         for message in self.run_context.messages:
@@ -215,7 +301,7 @@ async def step(self):
         )
         self._simple_print_message_role("[AftCompact]")
 
-        async for llm_response in self._iter_llm_responses():
+        async for llm_response in self._iter_llm_responses_with_fallback():
             if llm_response.is_chunk:
                 # update ttft
                 if self.stats.time_to_first_token == 0:
diff --git a/astrbot/core/astr_main_agent.py b/astrbot/core/astr_main_agent.py
index 12c4fde1d..7883dca8f 100644
--- a/astrbot/core/astr_main_agent.py
+++ b/astrbot/core/astr_main_agent.py
@@ -870,6 +870,41 @@ def _get_compress_provider(
     return provider
 
 
+def _get_fallback_chat_providers(
+    provider: Provider, plugin_context: Context, provider_settings: dict
+) -> list[Provider]:
+    fallback_ids = provider_settings.get("fallback_chat_models", [])
+    if not isinstance(fallback_ids, list):
+        logger.warning(
+            "fallback_chat_models setting is not a list, skip fallback providers."
+        )
+        return []
+
+    provider_id = str(provider.provider_config.get("id", ""))
+    seen_provider_ids: set[str] = {provider_id} if provider_id else set()
+    fallbacks: list[Provider] = []
+
+    for fallback_id in fallback_ids:
+        if not isinstance(fallback_id, str) or not fallback_id:
+            continue
+        if fallback_id in seen_provider_ids:
+            continue
+        fallback_provider = plugin_context.get_provider_by_id(fallback_id)
+        if fallback_provider is None:
+            logger.warning("Fallback chat provider `%s` not found, skip.", fallback_id)
+            continue
+        if not isinstance(fallback_provider, Provider):
+            logger.warning(
+                "Fallback chat provider `%s` is invalid type: %s, skip.",
+                fallback_id,
+                type(fallback_provider),
+            )
+            continue
+        fallbacks.append(fallback_provider)
+        seen_provider_ids.add(fallback_id)
+    return fallbacks
+
+
 async def build_main_agent(
     *,
     event: AstrMessageEvent,
@@ -1093,6 +1128,9 @@ async def build_main_agent(
         truncate_turns=config.dequeue_context_length,
         enforce_max_turns=config.max_context_length,
         tool_schema_mode=config.tool_schema_mode,
+        fallback_providers=_get_fallback_chat_providers(
+            provider, plugin_context, config.provider_settings
+        ),
     )
 
     if apply_reset:
diff --git a/astrbot/core/config/default.py b/astrbot/core/config/default.py
index 235915c59..43d9991bd 100644
--- a/astrbot/core/config/default.py
+++ b/astrbot/core/config/default.py
@@ -68,6 +68,7 @@
     "provider_settings": {
         "enable": True,
         "default_provider_id": "",
+        "fallback_chat_models": [],
         "default_image_caption_provider_id": "",
         "image_caption_prompt": "Please describe the image using Chinese.",
         "provider_pool": ["*"],  # "*" 表示使用所有可用的提供者
@@ -2207,6 +2208,10 @@ class ChatProviderTemplate(TypedDict):
                     "default_provider_id": {
                         "type": "string",
                     },
+                    "fallback_chat_models": {
+                        "type": "list",
+                        "items": {"type": "string"},
+                    },
                     "wake_prefix": {
                         "type": "string",
                     },
@@ -2504,15 +2509,22 @@ class ChatProviderTemplate(TypedDict):
             },
             "ai": {
                 "description": "模型",
-                "hint": "当使用非内置 Agent 执行器时，默认聊天模型和默认图片转述模型可能会无效，但某些插件会依赖此配置项来调用 AI 能力。",
+                "hint": "当使用非内置 Agent 执行器时，默认对话模型和默认图片转述模型可能会无效，但某些插件会依赖此配置项来调用 AI 能力。",
                 "type": "object",
                 "items": {
                     "provider_settings.default_provider_id": {
-                        "description": "默认聊天模型",
+                        "description": "默认对话模型",
                         "type": "string",
                         "_special": "select_provider",
                         "hint": "留空时使用第一个模型",
                     },
+                    "provider_settings.fallback_chat_models": {
+                        "description": "回退对话模型列表",
+                        "type": "list",
+                        "items": {"type": "string"},
+                        "_special": "select_providers",
+                        "hint": "主聊天模型请求失败时，按顺序切换到这些模型。",
+                    },
                     "provider_settings.default_image_caption_provider_id": {
                         "description": "默认图片转述模型",
                         "type": "string",
diff --git a/dashboard/src/components/shared/ConfigItemRenderer.vue b/dashboard/src/components/shared/ConfigItemRenderer.vue
index 5f2341ee7..3c3262064 100644
--- a/dashboard/src/components/shared/ConfigItemRenderer.vue
+++ b/dashboard/src/components/shared/ConfigItemRenderer.vue
@@ -10,6 +10,14 @@
     <template v-else-if="itemMeta?._special === 'select_provider_tts'">
       <ProviderSelector :model-value="modelValue" @update:model-value="emitUpdate" :provider-type="'text_to_speech'" />
     </template>
+    <template v-else-if="itemMeta?._special === 'select_providers'">
+      <ProviderSelector
+        :model-value="modelValue"
+        @update:model-value="emitUpdate"
+        :provider-type="'chat_completion'"
+        :multiple="true"
+      />
+    </template>
     <template v-else-if="getSpecialName(itemMeta?._special) === 'select_agent_runner_provider'">
       <ProviderSelector
         :model-value="modelValue"
diff --git a/dashboard/src/components/shared/ProviderSelector.vue b/dashboard/src/components/shared/ProviderSelector.vue
index 3e32bc8e9..7ffbeb6ea 100644
--- a/dashboard/src/components/shared/ProviderSelector.vue
+++ b/dashboard/src/components/shared/ProviderSelector.vue
@@ -1,16 +1,35 @@
 <template>
   <div class="d-flex align-center justify-space-between">
-    <span v-if="!modelValue" style="color: rgb(var(--v-theme-primaryText));">
+    <span v-if="!hasSelection" style="color: rgb(var(--v-theme-primaryText));">
       {{ tm('providerSelector.notSelected') }}
     </span>
     <span v-else class="provider-name-text">
-      {{ modelValue }}
+      <template v-if="multiple">
+        {{ tm('providerSelector.selectedCount', { count: selectedProviders.length }) }}
+      </template>
+      <template v-else>
+        {{ modelValue }}
+      </template>
     </span>
     <v-btn size="small" color="primary" variant="tonal" @click="openDialog">
       {{ buttonText || tm('providerSelector.buttonText') }}
     </v-btn>
   </div>
 
+  <div v-if="multiple && selectedProviders.length > 0" class="selected-preview mt-2">
+    <v-chip
+      v-for="providerId in selectedProviders"
+      :key="`preview-${providerId}`"
+      size="x-small"
+      color="primary"
+      variant="tonal"
+      class="mr-1 mb-1"
+      label
+    >
+      {{ providerId }}
+    </v-chip>
+  </div>
+
   <!-- Provider Selection Dialog -->
   <v-dialog v-model="dialog" max-width="600px">
     <v-card>
@@ -32,10 +51,52 @@
       
       <v-card-text class="pa-0" style="max-height: 400px; overflow-y: auto;">
         <v-progress-linear v-if="loading" indeterminate color="primary"></v-progress-linear>
+
+        <div v-if="multiple && selectedProviders.length > 0" class="pa-3">
+          <div class="text-caption text-medium-emphasis mb-2">
+            {{ tm('providerSelector.selectedCount', { count: selectedProviders.length }) }}
+          </div>
+          <v-list density="compact" class="selected-order-list">
+            <v-list-item
+              v-for="(providerId, index) in selectedProviders"
+              :key="`selected-${providerId}-${index}`"
+              rounded="md"
+              class="ma-1"
+            >
+              <v-list-item-title>{{ providerId }}</v-list-item-title>
+              <template #append>
+                <div class="d-flex ga-1">
+                  <v-btn
+                    icon="mdi-arrow-up"
+                    size="x-small"
+                    variant="text"
+                    :disabled="index === 0"
+                    @click.stop="moveSelected(index, -1)"
+                  />
+                  <v-btn
+                    icon="mdi-arrow-down"
+                    size="x-small"
+                    variant="text"
+                    :disabled="index === selectedProviders.length - 1"
+                    @click.stop="moveSelected(index, 1)"
+                  />
+                  <v-btn
+                    icon="mdi-close"
+                    size="x-small"
+                    variant="text"
+                    @click.stop="removeSelected(providerId)"
+                  />
+                </div>
+              </template>
+            </v-list-item>
+          </v-list>
+          <v-divider class="ma-1"></v-divider>
+        </div>
         
         <v-list v-if="!loading && providerList.length > 0" density="compact">
           <!-- 不选择选项 -->
           <v-list-item
+            v-if="!multiple"
             key="none"
             value=""
             @click="selectProvider({ id: '' })"
@@ -57,7 +118,7 @@
             :key="provider.id"
             :value="provider.id"
             @click="selectProvider(provider)"
-            :active="selectedProvider === provider.id"
+            :active="isProviderSelected(provider.id)"
             rounded="md"
             class="ma-1">
             <v-list-item-title>{{ provider.id }}</v-list-item-title>
@@ -67,7 +128,7 @@
             </v-list-item-subtitle>
             
             <template v-slot:append>
-              <v-icon v-if="selectedProvider === provider.id" color="primary">mdi-check-circle</v-icon>
+              <v-icon v-if="isProviderSelected(provider.id)" color="primary">mdi-check-circle</v-icon>
             </template>
           </v-list-item>
         </v-list>
@@ -121,7 +182,7 @@ import ProviderPage from '@/views/ProviderPage.vue'
 
 const props = defineProps({
   modelValue: {
-    type: String,
+    type: [String, Array],
     default: ''
   },
   providerType: {
@@ -135,6 +196,10 @@ const props = defineProps({
   buttonText: {
     type: String,
     default: ''
+  },
+  multiple: {
+    type: Boolean,
+    default: false
   }
 })
 
@@ -145,8 +210,16 @@ const dialog = ref(false)
 const providerList = ref([])
 const loading = ref(false)
 const selectedProvider = ref('')
+const selectedProviders = ref([])
 const providerDrawer = ref(false)
 
+const hasSelection = computed(() => {
+  if (props.multiple) {
+    return selectedProviders.value.length > 0
+  }
+  return Boolean(props.modelValue)
+})
+
 const defaultTab = computed(() => {
   if (props.providerType === 'agent_runner' && props.providerSubtype) {
     return `select_agent_runner_provider:${props.providerSubtype}`
@@ -156,7 +229,13 @@ const defaultTab = computed(() => {
 
 // 监听 modelValue 变化，同步到 selectedProvider
 watch(() => props.modelValue, (newValue) => {
-  selectedProvider.value = newValue || ''
+  if (props.multiple) {
+    selectedProviders.value = Array.isArray(newValue)
+      ? [...newValue.filter((v) => typeof v === 'string' && v)]
+      : []
+    return
+  }
+  selectedProvider.value = typeof newValue === 'string' ? newValue : ''
 }, { immediate: true })
 
 watch(providerDrawer, (isOpen, wasOpen) => {
@@ -166,7 +245,13 @@ watch(providerDrawer, (isOpen, wasOpen) => {
 })
 
 async function openDialog() {
-  selectedProvider.value = props.modelValue || ''
+  if (props.multiple) {
+    selectedProviders.value = Array.isArray(props.modelValue)
+      ? [...props.modelValue.filter((v) => typeof v === 'string' && v)]
+      : []
+  } else {
+    selectedProvider.value = typeof props.modelValue === 'string' ? props.modelValue : ''
+  }
   dialog.value = true
   await loadProviders()
 }
@@ -205,19 +290,72 @@ function matchesProviderSubtype(provider, subtype) {
 }
 
 function selectProvider(provider) {
+  if (props.multiple) {
+    if (!provider.id) {
+      selectedProviders.value = []
+      return
+    }
+    const idx = selectedProviders.value.indexOf(provider.id)
+    if (idx >= 0) {
+      selectedProviders.value.splice(idx, 1)
+    } else {
+      selectedProviders.value.push(provider.id)
+    }
+    return
+  }
   selectedProvider.value = provider.id
 }
 
 function confirmSelection() {
-  emit('update:modelValue', selectedProvider.value)
+  if (props.multiple) {
+    emit('update:modelValue', [...selectedProviders.value])
+  } else {
+    emit('update:modelValue', selectedProvider.value)
+  }
   dialog.value = false
 }
 
 function cancelSelection() {
-  selectedProvider.value = props.modelValue || ''
+  if (props.multiple) {
+    selectedProviders.value = Array.isArray(props.modelValue)
+      ? [...props.modelValue.filter((v) => typeof v === 'string' && v)]
+      : []
+  } else {
+    selectedProvider.value = typeof props.modelValue === 'string' ? props.modelValue : ''
+  }
   dialog.value = false
 }
 
+function isProviderSelected(providerId) {
+  if (props.multiple) {
+    return selectedProviders.value.includes(providerId)
+  }
+  return selectedProvider.value === providerId
+}
+
+function removeSelected(providerId) {
+  const idx = selectedProviders.value.indexOf(providerId)
+  if (idx >= 0) {
+    selectedProviders.value.splice(idx, 1)
+  }
+}
+
+function moveSelected(index, delta) {
+  const targetIndex = index + delta
+  if (
+    targetIndex < 0
+    || targetIndex >= selectedProviders.value.length
+    || index < 0
+    || index >= selectedProviders.value.length
+  ) {
+    return
+  }
+  const copied = [...selectedProviders.value]
+  const [item] = copied.splice(index, 1)
+  copied.splice(targetIndex, 0, item)
+  selectedProviders.value = copied
+}
+
 function openProviderDrawer() {
   providerDrawer.value = true
 }
@@ -236,6 +374,16 @@ function closeProviderDrawer() {
   display: inline-block;
 }
 
+.selected-preview {
+  width: 100%;
+  max-width: 100%;
+}
+
+.selected-order-list {
+  background: rgba(var(--v-theme-surface-variant), 0.15);
+  border-radius: 10px;
+}
+
 .v-list-item {
   transition: all 0.2s ease;
 }
diff --git a/dashboard/src/i18n/locales/en-US/core/shared.json b/dashboard/src/i18n/locales/en-US/core/shared.json
index ed4fefc55..cc4b81094 100644
--- a/dashboard/src/i18n/locales/en-US/core/shared.json
+++ b/dashboard/src/i18n/locales/en-US/core/shared.json
@@ -45,7 +45,8 @@
     "unknownType": "Unknown type",
     "createProvider": "Create Provider",
     "manageProviders": "Provider Management",
-    "selectProviderPool": "Select Provider Pool..."
+    "selectProviderPool": "Select Provider Pool...",
+    "selectedCount": "{count} provider(s) selected"
   },
   "personaSelector": {
     "notSelected": "Not selected",
diff --git a/dashboard/src/i18n/locales/en-US/features/config-metadata.json b/dashboard/src/i18n/locales/en-US/features/config-metadata.json
index 1fdd2ca91..19330d6cb 100644
--- a/dashboard/src/i18n/locales/en-US/features/config-metadata.json
+++ b/dashboard/src/i18n/locales/en-US/features/config-metadata.json
@@ -37,6 +37,10 @@
           "description": "Default Chat Model",
           "hint": "Uses the first model when left empty"
         },
+        "fallback_chat_models": {
+          "description": "Fallback chat model IDs",
+          "hint": "When the primary chat model request fails, fallback to these chat models in order."
+        },
         "default_image_caption_provider_id": {
           "description": "Default Image Caption Model",
           "hint": "Leave empty to disable; useful for non-multimodal models"
diff --git a/dashboard/src/i18n/locales/zh-CN/core/shared.json b/dashboard/src/i18n/locales/zh-CN/core/shared.json
index 106700551..9831b4eb1 100644
--- a/dashboard/src/i18n/locales/zh-CN/core/shared.json
+++ b/dashboard/src/i18n/locales/zh-CN/core/shared.json
@@ -45,7 +45,8 @@
     "unknownType": "未知类型",
     "createProvider": "创建提供商",
     "manageProviders": "提供商管理",
-    "selectProviderPool": "选择提供商池..."
+    "selectProviderPool": "选择提供商池...",
+    "selectedCount": "已选择 {count} 个提供商"
   },
   "personaSelector": {
     "notSelected": "未选择",
diff --git a/dashboard/src/i18n/locales/zh-CN/features/config-metadata.json b/dashboard/src/i18n/locales/zh-CN/features/config-metadata.json
index 67c1d490e..6c9edd49f 100644
--- a/dashboard/src/i18n/locales/zh-CN/features/config-metadata.json
+++ b/dashboard/src/i18n/locales/zh-CN/features/config-metadata.json
@@ -31,12 +31,16 @@
     },
     "ai": {
       "description": "模型",
-      "hint": "当使用非内置 Agent 执行器时,默认聊天模型和默认图片转述模型可能会无效,但某些插件会依赖此配置项来调用 AI 能力。",
+      "hint": "当使用非内置 Agent 执行器时,默认对话模型和默认图片转述模型可能会无效,但某些插件会依赖此配置项来调用 AI 能力。",
       "provider_settings": {
         "default_provider_id": {
-          "description": "默认聊天模型",
+          "description": "默认对话模型",
           "hint": "留空时使用第一个模型"
         },
+        "fallback_chat_models": {
+          "description": "回退对话模型列表",
+          "hint": "主对话模型请求失败时，按顺序切换到这些对话模型。"
+        },
         "default_image_caption_provider_id": {
           "description": "默认图片转述模型",
           "hint": "留空代表不使用,可用于非多模态模型"
diff --git a/tests/test_tool_loop_agent_runner.py b/tests/test_tool_loop_agent_runner.py
index f0e90002d..4a91877fd 100644
--- a/tests/test_tool_loop_agent_runner.py
+++ b/tests/test_tool_loop_agent_runner.py
@@ -90,6 +90,21 @@ async def generator():
         return generator()
 
 
+class MockFailingProvider(MockProvider):
+    async def text_chat(self, **kwargs) -> LLMResponse:
+        self.call_count += 1
+        raise RuntimeError("primary provider failed")
+
+
+class MockErrProvider(MockProvider):
+    async def text_chat(self, **kwargs) -> LLMResponse:
+        self.call_count += 1
+        return LLMResponse(
+            role="err",
+            completion_text="primary provider returned error",
+        )
+
+
 class MockHooks(BaseAgentRunHooks):
     """模拟钩子函数"""
 
@@ -321,6 +336,64 @@ async def test_hooks_called_with_max_step(
     assert mock_hooks.tool_end_called, "on_tool_end应该被调用"
 
 
+@pytest.mark.asyncio
+async def test_fallback_provider_used_when_primary_raises(
+    runner, provider_request, mock_tool_executor, mock_hooks
+):
+    primary_provider = MockFailingProvider()
+    fallback_provider = MockProvider()
+    fallback_provider.should_call_tools = False
+
+    await runner.reset(
+        provider=primary_provider,
+        request=provider_request,
+        run_context=ContextWrapper(context=None),
+        tool_executor=mock_tool_executor,
+        agent_hooks=mock_hooks,
+        streaming=False,
+        fallback_providers=[fallback_provider],
+    )
+
+    async for _ in runner.step_until_done(5):
+        pass
+
+    final_resp = runner.get_final_llm_resp()
+    assert final_resp is not None
+    assert final_resp.role == "assistant"
+    assert final_resp.completion_text == "这是我的最终回答"
+    assert primary_provider.call_count == 1
+    assert fallback_provider.call_count == 1
+
+
+@pytest.mark.asyncio
+async def test_fallback_provider_used_when_primary_returns_err(
+    runner, provider_request, mock_tool_executor, mock_hooks
+):
+    primary_provider = MockErrProvider()
+    fallback_provider = MockProvider()
+    fallback_provider.should_call_tools = False
+
+    await runner.reset(
+        provider=primary_provider,
+        request=provider_request,
+        run_context=ContextWrapper(context=None),
+        tool_executor=mock_tool_executor,
+        agent_hooks=mock_hooks,
+        streaming=False,
+        fallback_providers=[fallback_provider],
+    )
+
+    async for _ in runner.step_until_done(5):
+        pass
+
+    final_resp = runner.get_final_llm_resp()
+    assert final_resp is not None
+    assert final_resp.role == "assistant"
+    assert final_resp.completion_text == "这是我的最终回答"
+    assert primary_provider.call_count == 1
+    assert fallback_provider.call_count == 1
+
+
 if __name__ == "__main__":
     # 运行测试
     pytest.main([__file__, "-v"])