diff --git a/backend/api/server.py b/backend/api/server.py
index a8faacd..908d9fb 100644
--- a/backend/api/server.py
+++ b/backend/api/server.py
@@ -66,6 +66,68 @@ VALIDATED_CHAT_MODEL_PROVIDERS = {
     'zhipuai',
 }
 
+UNSUPPORTED_TOOL_CHAT_MODEL_IDS = {
+    # 这些模型来自 /models，但带 tools/tool_choice 的最小 Agent 请求实测失败。
+    'azure_openai/gpt-5.5',
+    'azure_openai/grok-3',
+    'azure_openai/grok-3-mini',
+    'minimax/abab6.5t-chat',
+    'ppio/gemini-2.0-flash-20250609',
+    'siliconflow/deepseek-ai/deepseek-ocr',
+    'siliconflow/deepseek-ai/deepseek-r1-distill-qwen-14b',
+    'siliconflow/deepseek-ai/deepseek-r1-distill-qwen-32b',
+    'siliconflow/deepseek-ai/deepseek-r1-distill-qwen-7b',
+    'siliconflow/qwen/qwen2.5-coder-32b-instruct',
+    'siliconflow/qwen/qwen2.5-vl-32b-instruct',
+    'siliconflow/qwen/qwen2.5-vl-72b-instruct',
+    'siliconflow/qwen/qwen3-235b-a22b',
+    'siliconflow/qwen/qwen3-235b-a22b-thinking-2507',
+    'siliconflow/qwen/qwen3-30b-a3b-instruct-2507',
+    'siliconflow/qwen/qwen3-vl-8b-instruct',
+    'siliconflow/qwen/qwen3-vl-8b-thinking',
+    'siliconflow/thudm/glm-4-9b-chat',
+    'siliconflow/thudm/glm-4.1v-9b-thinking',
+    'siliconflow/zai-org/glm-4.5',
+    'tongyi/deepseek-r1-distill-qwen-14b',
+    'tongyi/deepseek-r1-distill-qwen-32b',
+    'tongyi/qwen-mt-plus',
+    'tongyi/qwen-mt-turbo',
+    'tongyi/qwen-plus-0919',
+    'tongyi/qwen2.5-0.5b-instruct',
+    'tongyi/qwen2.5-1.5b-instruct',
+    'tongyi/qwen3-0.6b',
+    'tongyi/qwen3-1.7b',
+    'tongyi/qwen3-30b-a3b',
+    'tongyi/qwen3-4b',
+    'tongyi/qwen3-8b',
+    'vertex_ai/gemini-2.0-flash-001',
+    'vertex_ai/gemini-2.0-flash-lite-001',
+    'vertex_ai/gemini-2.5-computer-use-preview-10-2025',
+    'vertex_ai/gemini-2.5-flash',
+    'vertex_ai/gemini-2.5-flash-lite',
+    'vertex_ai/gemini-2.5-flash-lite-preview-09-2025',
+    'vertex_ai/gemini-2.5-pro',
+    'vertex_ai/gemini-3-flash-preview',
+    'vertex_ai/gemini-3.1-flash-lite-preview',
+    'vertex_ai/gemini-3.1-pro-preview',
+    'vertex_ai/gemini-3.1-pro-preview-pt',
+    'wenxin/ernie-speed-128k',
+    'wenxin/ernie-speed-8k',
+    'xiaomi/mi-brag-vl',
+    'xiaomi/midashenglm-7b-1021-bf16',
+    'xiaomi/milm2.1-13b-chat',
+    'xiaomi/mimo-vl-7b-rl',
+    'xiaomi/mimo-vl-7b-rl-0808',
+    'xiaomi/paddleocr-vl-0.9b',
+    'xiaomi/qwen-235b-a22b',
+    'xiaomi/qwen2.5-72b-instruct-gptq-int4',
+    'xiaomi/qwen2.5-vl-72b-instruct-awq',
+    'xiaomi/qwen25-coder-7b',
+    'xiaomi/qwen3-235b-a22b',
+    'xiaomi/qwen3-235b-a22b-instruct-2507',
+    'xiaomi/qwen3-32b',
+}
+
 # WebUI 的快速入口只展示可以通过对话输入框安全执行的 slash command。
 # 这些命令仍然保留在终端 `/` 列表里，但不适合作为 WebUI 快捷项。
 WEBUI_HIDDEN_SLASH_COMMANDS = {
@@ -1549,6 +1611,8 @@ def _normalize_model_list(payload: Any) -> list[dict[str, str]]:
         if provider and provider not in VALIDATED_CHAT_MODEL_PROVIDERS:
             continue
         normalized = _normalize_model_id(model_id, provider=provider)
+        if normalized is not None and normalized.lower() in UNSUPPORTED_TOOL_CHAT_MODEL_IDS:
+            continue
         if normalized is not None:
             entry = {'id': normalized}
             if provider:
diff --git a/tests/test_model_list.py b/tests/test_model_list.py
index 7243f96..bbcad24 100644
--- a/tests/test_model_list.py
+++ b/tests/test_model_list.py
@@ -32,6 +32,12 @@ class ModelListTests(unittest.TestCase):
                     'owned_by': 'azure_openai',
                     'model_type': 'llm',
                 },
+                {
+                    'id': 'gpt-5.5',
+                    'object': 'model',
+                    'owned_by': 'azure_openai',
+                    'model_type': 'llm',
+                },
                 {
                     'id': 'gpt-4o-audio-preview',
                     'object': 'model',
@@ -63,7 +69,7 @@ class ModelListTests(unittest.TestCase):
                     'model_type': 'llm',
                 },
                 {
-                    'id': 'gemini-2.0-flash-20250609',
+                    'id': 'gemini-2.5-flash',
                     'object': 'model',
                     'owned_by': 'ppio',
                     'model_type': 'llm',
@@ -77,7 +83,7 @@ class ModelListTests(unittest.TestCase):
             [model['id'] for model in models],
             [
                 'azure_openai/gpt-5',
-                'ppio/gemini-2.0-flash-20250609',
+                'ppio/gemini-2.5-flash',
                 'ppio/pa/claude-opus-4-7',
                 'siliconflow/Pro/deepseek-ai/DeepSeek-V3',
                 'xiaomi/DeepSeek-R1-0528',