diff --git a/app/api/endpoints/llm.py b/app/api/endpoints/llm.py
index d9ad4ac5a..33eeb0057 100644
--- a/app/api/endpoints/llm.py
+++ b/app/api/endpoints/llm.py
@@ -1,4 +1,4 @@
-from typing import Any, Dict, Optional
+from typing import Any, Dict, List, Optional, Union
 
 from fastapi import Depends, Request, Response
 from fastapi.responses import HTMLResponse
@@ -15,7 +15,9 @@ router = ResponseAPIRouter()
 @router.post(
     "/manage",
     summary="LLM提供商统一管理",
-    response_model=schemas.Response[Dict[str, Any]],
+    # 各动作 data 形态不一：目录查询返回列表，其余动作返回映射，
+    # 须用具体联合类型声明，而非单一开放映射
+    response_model=schemas.Response[Union[List[Dict[str, Any]], Dict[str, Any]]],
 )
 async def manage_provider(
         request: Request,
diff --git a/tests/test_api_response.py b/tests/test_api_response.py
index b88002782..b12f39313 100644
--- a/tests/test_api_response.py
+++ b/tests/test_api_response.py
@@ -637,6 +637,8 @@ def test_openapi_success_models_have_no_implicit_empty_nested_schemas():
         "ManageRequest",
         # 通用管理响应的 data 为模块自定义结构，按设计不固定字段。
         "Response_Dict_str__Any__",
+        # LLM 提供商管理响应的 data 目录查询为列表、其余动作为映射。
+        "Response_Union_List_Dict_str__Any____Dict_str__Any___",
     }
     allowed_empty_components = {"McpJsonRpcEmptyResult"}
     violations = []
diff --git a/tests/test_llm_provider_manage.py b/tests/test_llm_provider_manage.py
index 54f24d911..8689a1e6a 100644
--- a/tests/test_llm_provider_manage.py
+++ b/tests/test_llm_provider_manage.py
@@ -279,3 +279,32 @@ def test_llm_manage_endpoint_accepts_empty_target(monkeypatch):
     assert resp.success is True
     assert captured["provider"] == ""
     assert "callback_url" not in captured["params"]
+
+
+def test_llm_manage_endpoint_response_model_accepts_list_data():
+    """目录查询动作 data 为列表，响应模型须同时覆盖列表与映射形态。
+
+    回归守护：list_providers 返回 list[dict]，
+    若响应模型声明为 Dict[str, Any] 会在序列化校验时直接 500；
+    同时受响应模型守护测试约束，不得使用 Any/JsonData 弱类型。
+    """
+    from typing import Any, Dict, List, Union
+
+    from app.api.endpoints import llm as llm_endpoint
+
+    route = next(
+        r for r in llm_endpoint.router.routes if getattr(r, "path", "").endswith("/manage")
+    )
+    assert route.response_model is schemas.Response[
+        Union[List[Dict[str, Any]], Dict[str, Any]]
+    ]
+
+    list_resp = schemas.Response[Union[List[Dict[str, Any]], Dict[str, Any]]](
+        success=True, message="", data=[{"id": "openai", "name": "OpenAI 兼容"}]
+    )
+    assert list_resp.data == [{"id": "openai", "name": "OpenAI 兼容"}]
+
+    dict_resp = schemas.Response[Union[List[Dict[str, Any]], Dict[str, Any]]](
+        success=True, message="", data={"models": ["gpt-4o"]}
+    )
+    assert dict_resp.data == {"models": ["gpt-4o"]}