fix(litellm): initialize langsmith flag

tests/test_litellm_provider.py

@@ -0,0 +1,26 @@
+from nanobot.providers.litellm_provider import LiteLLMProvider
+
+
+def test_litellm_provider_initializes_langsmith_flag(monkeypatch) -> None:
+    monkeypatch.setenv("LANGSMITH_API_KEY", "ls-test")
+
+    provider = LiteLLMProvider(default_model="openai/gpt-4o-mini")
+
+    assert provider._langsmith_enabled is True
+
+
+def test_litellm_provider_build_chat_kwargs_adds_langsmith_callback(monkeypatch) -> None:
+    monkeypatch.setenv("LANGSMITH_API_KEY", "ls-test")
+
+    provider = LiteLLMProvider(default_model="openai/gpt-4o-mini")
+    kwargs, _ = provider._build_chat_kwargs(
+        messages=[{"role": "user", "content": "hello"}],
+        tools=None,
+        model=None,
+        max_tokens=128,
+        temperature=0.1,
+        reasoning_effort=None,
+        tool_choice=None,
+    )
+
+    assert kwargs["callbacks"] == ["langsmith"]