diff --git a/api/streaming.py b/api/streaming.py
index 7460fefe..20a78e47 100644
--- a/api/streaming.py
+++ b/api/streaming.py
@@ -1209,17 +1209,23 @@ def _is_minimax_route(provider: str = '', model: str = '', base_url: str = '') -
     return 'minimax' in text or 'minimaxi.com' in text
 
 
-def _aux_title_configured() -> bool:
-    """Return True when any auxiliary title_generation config field is meaningfully set."""
+def _get_aux_title_config() -> dict:
+    """Return title_generation auxiliary config, or an empty dict on errors."""
     try:
         from agent.auxiliary_client import _get_auxiliary_task_config
         tg = _get_auxiliary_task_config('title_generation')
-        provider = tg.get('provider', '') or ''
-        model = tg.get('model', '') or ''
-        base_url = tg.get('base_url', '') or ''
-        return bool(model or base_url or (provider and provider.lower() != 'auto'))
+        return tg if isinstance(tg, dict) else {}
     except Exception:
-        return False
+        return {}
+
+
+def _aux_title_configured() -> bool:
+    """Return True when any auxiliary title_generation config field is meaningfully set."""
+    tg = _get_aux_title_config()
+    provider = tg.get('provider', '') or ''
+    model = tg.get('model', '') or ''
+    base_url = tg.get('base_url', '') or ''
+    return bool(model or base_url or (provider and provider.lower() != 'auto'))
 
 def _aux_title_timeout(default: float = 15.0) -> float:
     """Return the configured timeout (seconds) for auxiliary title generation.
@@ -1229,8 +1235,7 @@ def _aux_title_timeout(default: float = 15.0) -> float:
     so mis-configurations are visible in server output.
     """
     try:
-        from agent.auxiliary_client import _get_auxiliary_task_config
-        tg = _get_auxiliary_task_config('title_generation')
+        tg = _get_aux_title_config()
         raw = tg.get('timeout')
         if raw is None:
             return default
@@ -1363,6 +1368,12 @@ def generate_title_raw_via_aux(
     if not user_text or not assistant_text:
         return None, 'missing_exchange'
     qa, prompts = _title_prompts(user_text, assistant_text)
+    configured = _get_aux_title_config()
+    provider = provider or configured.get('provider', '') or ''
+    if str(provider).strip().lower() == 'auto':
+        provider = ''
+    model = model or configured.get('model', '') or ''
+    base_url = base_url or configured.get('base_url', '') or ''
     base_max_tokens = _title_completion_budget(provider, model, base_url)
     reasoning_extra = {"reasoning": {"enabled": False}}
     if _is_minimax_route(provider, model, base_url):
diff --git a/tests/test_title_aux_routing.py b/tests/test_title_aux_routing.py
index c9a1552d..f3c7cb82 100644
--- a/tests/test_title_aux_routing.py
+++ b/tests/test_title_aux_routing.py
@@ -109,6 +109,51 @@ class TestGenerateTitleRawViaAuxTimeout(unittest.TestCase):
             30.0,
         )
 
+    def test_configured_provider_model_and_base_url_are_passed_to_aux_client(self):
+        """Regression for #2235: task config must select the first title model.
+
+        If generate_title_raw_via_aux leaves provider/model/base_url as None,
+        agent.auxiliary_client.call_llm can fall back to the main chat model and
+        WebUI titles look like local first-message placeholders or unrelated
+        chat-model output instead of using auxiliary.title_generation.model.
+        """
+        from api.streaming import generate_title_raw_via_aux
+
+        mock_resp = types.SimpleNamespace(
+            choices=[
+                types.SimpleNamespace(
+                    message=types.SimpleNamespace(content='Configured Model Title'),
+                    finish_reason='stop',
+                )
+            ]
+        )
+        captured = {}
+
+        def fake_call_llm(**kwargs):
+            captured.update(kwargs)
+            return mock_resp
+
+        tg_config = {
+            'provider': 'openrouter',
+            'model': 'anthropic/claude-haiku-title',
+            'base_url': 'https://openrouter.ai/api/v1',
+            'timeout': 22.0,
+        }
+        with _patch_tg_config(tg_config):
+            with patch('agent.auxiliary_client.call_llm', side_effect=fake_call_llm, create=True):
+                result, status = generate_title_raw_via_aux(
+                    user_text='Explain why the moon has phases.',
+                    assistant_text='The moon has phases because we see different sunlit portions.',
+                )
+
+        self.assertEqual(result, 'Configured Model Title')
+        self.assertEqual(status, 'llm_aux')
+        self.assertEqual(captured.get('task'), 'title_generation')
+        self.assertEqual(captured.get('provider'), 'openrouter')
+        self.assertEqual(captured.get('model'), 'anthropic/claude-haiku-title')
+        self.assertEqual(captured.get('base_url'), 'https://openrouter.ai/api/v1')
+        self.assertEqual(captured.get('timeout'), 22.0)
+
     def test_integer_timeout_from_config(self):
         """Config timeout as int is coerced to float."""
         self._run_with_config(