diff --git a/litellm/main.py b/litellm/main.py
index 93b6c730d86..24de7204a04 100644
--- a/litellm/main.py
+++ b/litellm/main.py
@@ -1117,7 +1117,11 @@ def responses_api_bridge_check(
     # - Older GPT-5 names (e.g. ``gpt-5``, ``gpt-5.1``): bridge only when a reasoning
     #   summary alias is present with ``reasoning_effort`` (tools alone stay on chat).
     has_function_tool: Final = any(
-        (tool.get("type") == "function" if isinstance(tool, dict) else getattr(tool, "type", None) == "function")
+        (
+            tool.get("type") == "function" and (isinstance(tool.get("function"), dict) or "name" in tool)
+            if isinstance(tool, dict)
+            else getattr(tool, "type", None) == "function"
+        )
         for tool in (tools or ())
     )
     if isinstance(reasoning_effort, dict):
diff --git a/tests/test_litellm/test_main.py b/tests/test_litellm/test_main.py
index c2b45aac488..1990b96a51b 100644
--- a/tests/test_litellm/test_main.py
+++ b/tests/test_litellm/test_main.py
@@ -1049,6 +1049,35 @@ def test_responses_api_bridge_check_gpt_5_4_flat_function_tool_routes_to_respons
     assert model_info.get("mode") == "responses"
 
 
+@pytest.mark.parametrize(
+    "custom_llm_provider, model_name, api_base",
+    [
+        pytest.param("openai", "gpt-5.6", None, id="openai"),
+        pytest.param("azure_ai", "gpt-6-astra", "https://myproject.services.ai.azure.com", id="azure-ai-foundry"),
+    ],
+)
+def test_responses_api_bridge_check_function_tool_without_body_stays_chat(
+    monkeypatch, custom_llm_provider, model_name, api_base
+):
+    import litellm
+    from litellm.main import responses_api_bridge_check
+
+    monkeypatch.delenv("OPENAI_BASE_URL", raising=False)
+    monkeypatch.delenv("OPENAI_API_BASE", raising=False)
+    monkeypatch.setattr(litellm, "api_base", None)
+
+    model_info, model = responses_api_bridge_check(
+        model=model_name,
+        custom_llm_provider=custom_llm_provider,
+        tools=[{"type": "function"}],
+        reasoning_effort=None,
+        api_base=api_base,
+    )
+
+    assert model == model_name
+    assert model_info.get("mode") != "responses"
+
+
 def test_responses_api_bridge_check_dict_effort_none_stays_chat():
     """The escape hatch must honor litellm's dict form: {"effort": "none"} means reasoning off."""
     from litellm.main import responses_api_bridge_check