fix(providers): support anthropic proxy v1 endpoints

tests/agent/test_anthropic_adapter.py

@@ -113,6 +113,15 @@ class TestBuildAnthropicClient:
                 "anthropic-beta": "interleaved-thinking-2025-05-14,fine-grained-tool-streaming-2025-05-14"
             }
 
+    def test_custom_base_url_strips_trailing_v1(self):
+        with patch("agent.anthropic_adapter._anthropic_sdk") as mock_sdk:
+            build_anthropic_client(
+                "sk-ant-api03-x",
+                base_url="https://proxy.example.com/anthropic/v1",
+            )
+            kwargs = mock_sdk.Anthropic.call_args[1]
+            assert kwargs["base_url"] == "https://proxy.example.com/anthropic"
+
     def test_azure_anthropic_endpoint_keeps_context_1m_beta(self):
         with patch("agent.anthropic_adapter._anthropic_sdk") as mock_sdk:
             build_anthropic_client(

tests/agent/test_auxiliary_transport_autodetect.py

@@ -39,6 +39,8 @@ def _clean_env(monkeypatch):
     ("https://api.moonshot.ai/v1", False, "Moonshot legacy"),
     ("https://api.minimax.io/anthropic", True, "MiniMax /anthropic"),
     ("https://litellm.example.com/v1/anthropic", True, "/anthropic suffix"),
+    ("https://litellm.example.com/anthropic/v1", True, "/anthropic/v1 base"),
+    ("https://litellm.example.com/anthropic/v1/models", False, "/anthropic/v1 subpath"),
     ("https://api.anthropic.com", True, "native Anthropic"),
     ("https://api.anthropic.com/v1", True, "native Anthropic /v1"),
     ("https://openrouter.ai/api/v1", False, "OpenRouter"),

tests/hermes_cli/test_detect_api_mode_for_url.py

@@ -56,13 +56,16 @@ class TestAnthropicMessagesDetection:
     def test_trailing_slash_tolerated(self):
         assert _detect_api_mode_for_url("https://api.minimax.io/anthropic/") == "anthropic_messages"
 
+    def test_versioned_anthropic_base_url_tolerated(self):
+        assert _detect_api_mode_for_url("https://proxy.example.com/anthropic/v1") == "anthropic_messages"
+
     def test_uppercase_path_tolerated(self):
         assert _detect_api_mode_for_url("https://API.MINIMAX.IO/Anthropic") == "anthropic_messages"
 
-    def test_anthropic_in_middle_of_path_does_not_match(self):
+    def test_anthropic_endpoint_subpath_does_not_match(self):
         # The helper requires ``/anthropic`` as the path SUFFIX, not anywhere.
         # Protects against false positives on e.g. /anthropic/v1/models.
-        assert _detect_api_mode_for_url("https://api.example.com/anthropic/v1") is None
+        assert _detect_api_mode_for_url("https://api.example.com/anthropic/v1/models") is None
 
 
 class TestDefaultCase:

tests/hermes_cli/test_model_validation.py

@@ -215,6 +215,58 @@ class TestProviderModelIds:
              patch("hermes_cli.models._fetch_github_models", return_value=["gpt-5.4", "claude-sonnet-4.6"]):
             assert provider_model_ids("copilot-acp") == ["gpt-5.4", "claude-sonnet-4.6"]
 
+    def test_anthropic_provider_uses_configured_base_url_for_live_catalog(self):
+        class _Resp:
+            def __enter__(self):
+                return self
+
+            def __exit__(self, exc_type, exc, tb):
+                return False
+
+            def read(self):
+                return b'{"data": [{"id": "enterprise-claude"}]}'
+
+        with patch(
+            "hermes_cli.config.load_config",
+            return_value={
+                "model": {
+                    "provider": "anthropic",
+                    "base_url": "http://localhost:6655/anthropic/v1",
+                    "api_key": "proxy-key",
+                }
+            },
+        ), patch(
+            "hermes_cli.models.urllib.request.urlopen",
+            return_value=_Resp(),
+        ) as mock_urlopen:
+            assert provider_model_ids("anthropic") == ["enterprise-claude"]
+
+        req = mock_urlopen.call_args[0][0]
+        assert req.full_url == "http://localhost:6655/anthropic/v1/models"
+        assert req.get_header("X-api-key") == "proxy-key"
+
+    def test_custom_provider_passes_anthropic_mode_for_versioned_proxy_catalog(self):
+        with patch(
+            "hermes_cli.config.load_config",
+            return_value={
+                "model": {
+                    "provider": "custom",
+                    "base_url": "http://localhost:6655/anthropic/v1",
+                    "api_key": "proxy-key",
+                }
+            },
+        ), patch(
+            "hermes_cli.models.fetch_api_models",
+            return_value=["enterprise-claude"],
+        ) as mock_fetch:
+            assert provider_model_ids("custom") == ["enterprise-claude"]
+
+        mock_fetch.assert_called_once_with(
+            "proxy-key",
+            "http://localhost:6655/anthropic/v1",
+            api_mode="anthropic_messages",
+        )
+
 
 # -- fetch_api_models --------------------------------------------------------