fix(model): normalize direct provider ids in auxiliary routing

tests/agent/test_auxiliary_named_custom_providers.py

@@ -149,3 +149,83 @@ class TestResolveProviderClientNamedCustom:
         # "coffee" doesn't exist in custom_providers
         client, model = resolve_provider_client("coffee", "test")
         assert client is None
+
+
+class TestResolveProviderClientModelNormalization:
+    """Direct-provider auxiliary routing should normalize models like main runtime."""
+
+    def test_matching_native_prefix_is_stripped_for_main_provider(self, tmp_path):
+        _write_config(tmp_path, {
+            "model": {"default": "zai/glm-5.1", "provider": "zai"},
+        })
+        with (
+            patch("hermes_cli.auth.resolve_api_key_provider_credentials", return_value={
+                "api_key": "glm-key",
+                "base_url": "https://api.z.ai/api/paas/v4",
+            }),
+            patch("agent.auxiliary_client.OpenAI") as mock_openai,
+        ):
+            mock_openai.return_value = MagicMock()
+            from agent.auxiliary_client import resolve_provider_client
+
+            client, model = resolve_provider_client("main", "zai/glm-5.1")
+
+        assert client is not None
+        assert model == "glm-5.1"
+
+    def test_non_matching_prefix_is_preserved_for_direct_provider(self, tmp_path):
+        _write_config(tmp_path, {
+            "model": {"default": "zai/glm-5.1", "provider": "zai"},
+        })
+        with (
+            patch("hermes_cli.auth.resolve_api_key_provider_credentials", return_value={
+                "api_key": "glm-key",
+                "base_url": "https://api.z.ai/api/paas/v4",
+            }),
+            patch("agent.auxiliary_client.OpenAI") as mock_openai,
+        ):
+            mock_openai.return_value = MagicMock()
+            from agent.auxiliary_client import resolve_provider_client
+
+            client, model = resolve_provider_client("zai", "google/gemini-2.5-pro")
+
+        assert client is not None
+        assert model == "google/gemini-2.5-pro"
+
+    def test_aggregator_vendor_slug_is_preserved(self, monkeypatch):
+        monkeypatch.setenv("OPENROUTER_API_KEY", "or-key")
+        with patch("agent.auxiliary_client.OpenAI") as mock_openai:
+            mock_openai.return_value = MagicMock()
+            from agent.auxiliary_client import resolve_provider_client
+
+            client, model = resolve_provider_client(
+                "openrouter", "anthropic/claude-sonnet-4.6"
+            )
+
+        assert client is not None
+        assert model == "anthropic/claude-sonnet-4.6"
+
+
+class TestResolveVisionProviderClientModelNormalization:
+    """Vision auto-routing should reuse the same provider-specific normalization."""
+
+    def test_vision_auto_strips_matching_main_provider_prefix(self, tmp_path):
+        _write_config(tmp_path, {
+            "model": {"default": "zai/glm-5.1", "provider": "zai"},
+        })
+        with (
+            patch("agent.auxiliary_client._read_nous_auth", return_value=None),
+            patch("hermes_cli.auth.resolve_api_key_provider_credentials", return_value={
+                "api_key": "glm-key",
+                "base_url": "https://api.z.ai/api/paas/v4",
+            }),
+            patch("agent.auxiliary_client.OpenAI") as mock_openai,
+        ):
+            mock_openai.return_value = MagicMock()
+            from agent.auxiliary_client import resolve_vision_provider_client
+
+            provider, client, model = resolve_vision_provider_client()
+
+        assert provider == "zai"
+        assert client is not None
+        assert model == "glm-5.1"