feat(cloud): support Anthropic provider base URL

tests/test_tool_calling_client.py

@@ -1,7 +1,9 @@
 from __future__ import annotations
 
 import base64
+import sys
 from typing import Any
+from types import SimpleNamespace
 
 import pytest
 
@@ -124,6 +126,35 @@ def test_anthropic_tool_calling_client_includes_image_block_when_screenshot_pres
     assert content[1] == {"type": "text", "text": "user"}
 
 
+def test_anthropic_tool_calling_client_passes_custom_base_url_to_sdk(
+    monkeypatch,
+) -> None:
+    constructed: list[dict[str, Any]] = []
+
+    class RecordingAnthropic:
+        def __init__(self, **kwargs: str) -> None:
+            constructed.append(kwargs)
+
+    monkeypatch.setitem(
+        sys.modules,
+        "anthropic",
+        SimpleNamespace(Anthropic=RecordingAnthropic),
+    )
+    client = AnthropicToolCallingClient(
+        model="test-model",
+        api_key="managed-api-key",
+        base_url="https://anthropic-proxy.example",
+    )
+
+    assert isinstance(client._client(), RecordingAnthropic)
+    assert constructed == [
+        {
+            "api_key": "managed-api-key",
+            "base_url": "https://anthropic-proxy.example",
+        }
+    ]
+
+
 def test_anthropic_tool_calling_client_wraps_transport_errors() -> None:
     messages = FakeMessages(error=TimeoutError("timed out"))
     client = AnthropicToolCallingClient(model="test-model", transport=FakeTransport(messages))