Default AG2 Anthropic requests when the endpoint override is blank

Author: davidmckayv

agent-ag2/src/main.py

@@ -15,12 +15,14 @@ def _config() -> AnthropicConfig | OpenAIConfig:
     """The provider the model screen chose, which AG2 reaches through a config of its own.
 
     `BOT_PROVIDER` is `anthropic` for an Anthropic key and `openai` otherwise, an OpenAI-compatible
-    endpoint included. Each SDK reads its own key and base URL from the environment.
+    endpoint included. Each SDK reads its own key from the environment.
     """
     provider = (os.environ.get("BOT_PROVIDER") or "openai").strip()
     model = (os.environ.get("BOT_MODEL") or "gpt-4o-mini").strip()
     if provider == "anthropic":
-        return AnthropicConfig(model=model)
+        # Compose exports missing overrides as ""; the SDK only defaults an absent URL.
+        base_url = (os.environ.get("ANTHROPIC_BASE_URL") or "").strip() or "https://api.anthropic.com"
+        return AnthropicConfig(model=model, base_url=base_url)
     return OpenAIConfig(model=model)
 
 

agent-ag2/tests/test_main.py

@@ -6,6 +6,7 @@
 import time
 from pathlib import Path
 
+import httpx2
 import pytest
 import uvicorn
 from fastapi import FastAPI, Request
@@ -182,3 +183,49 @@ def test_a_run_reaches_the_model_the_setup_screen_chose(monkeypatch, provider, c
     assert '"RUN_FINISHED"' in response.text
     assert '"RUN_ERROR"' not in response.text
     assert seen == [expected]
+
+
+def test_an_anthropic_key_uses_the_official_endpoint_when_compose_sets_a_blank_url(monkeypatch):
+    seen = []
+
+    async def respond(transport, request):
+        body = json.loads(request.content)
+        seen.append((str(request.url), request.headers.get("x-api-key"), body["model"]))
+        return httpx2.Response(
+            200,
+            request=request,
+            json={
+                "id": "msg",
+                "type": "message",
+                "role": "assistant",
+                "model": body["model"],
+                "content": [{"type": "text", "text": "hello"}],
+                "stop_reason": "end_turn",
+                "stop_sequence": None,
+                "usage": {"input_tokens": 1, "output_tokens": 1},
+            },
+        )
+
+    # Keep the real AG2 and Anthropic clients; replace only the network transport.
+    monkeypatch.setattr(httpx2.AsyncHTTPTransport, "handle_async_request", respond)
+    monkeypatch.setenv("MANAGED_AGENT_TOKEN", TOKEN)
+    monkeypatch.setenv("BOT_PROVIDER", "anthropic")
+    monkeypatch.setenv("BOT_MODEL", "claude-sonnet-4-5")
+    monkeypatch.setenv("ANTHROPIC_API_KEY", "test-key")
+    monkeypatch.setenv("ANTHROPIC_BASE_URL", "")
+    monkeypatch.setenv("OPENAI_API_KEY", "")
+    monkeypatch.setenv("OPENAI_BASE_URL", "")
+    monkeypatch.delenv("ANTHROPIC_AUTH_TOKEN", raising=False)
+
+    from src import main
+
+    main = importlib.reload(main)
+    response = TestClient(main.app).post(
+        "/", json=RUN, headers={"x-openbot-agent-token": TOKEN}
+    )
+
+    assert seen == [("https://api.anthropic.com/v1/messages", "test-key", "claude-sonnet-4-5")]
+    assert response.status_code == 200
+    assert '"RUN_FINISHED"' in response.text
+    assert '"RUN_ERROR"' not in response.text
+    assert "hello" in response.text