fix anthropic key error msg

ra_aid/provider_strategy.py

@@ -157,9 +157,12 @@ class AnthropicStrategy(ProviderStrategy):
                     os.environ["EXPERT_ANTHROPIC_API_KEY"] = base_key
                     key = base_key
             if not key:
-                missing.append(
-                    "EXPERT_ANTHROPIC_API_KEY environment variable is not set"
-                )
+                # If neither expert nor base key is set, show base key message
+                base_key = os.environ.get("ANTHROPIC_API_KEY")
+                if not base_key:
+                    missing.append("ANTHROPIC_API_KEY environment variable is not set")
+                else:
+                    missing.append("EXPERT_ANTHROPIC_API_KEY environment variable is not set")
         else:
             key = os.environ.get("ANTHROPIC_API_KEY")
             if not key:

tests/ra_aid/test_anthropic_strategy.py

@@ -0,0 +1,48 @@
+import os
+from dataclasses import dataclass
+from typing import Any, Optional
+
+import pytest
+
+from ra_aid.provider_strategy import AnthropicStrategy
+
+
+@pytest.fixture
+def clean_env():
+    """Remove relevant environment variables before each test."""
+    # Save existing values
+    saved_vars = {}
+    for var in ['ANTHROPIC_API_KEY', 'EXPERT_ANTHROPIC_API_KEY', 
+                'ANTHROPIC_MODEL', 'EXPERT_ANTHROPIC_MODEL']:
+        saved_vars[var] = os.environ.get(var)
+        if var in os.environ:
+            del os.environ[var]
+    
+    yield
+    
+    # Restore saved values
+    for var, value in saved_vars.items():
+        if value is not None:
+            os.environ[var] = value
+        elif var in os.environ:
+            del os.environ[var]
+
+
+@dataclass
+class MockArgs:
+    """Mock arguments class for testing."""
+    expert_provider: str
+    expert_model: Optional[str] = None
+
+
+def test_anthropic_expert_validation_message(clean_env):
+    """Test that validation message refers to base key when neither key exists."""
+    strategy = AnthropicStrategy()
+    args = MockArgs(expert_provider="anthropic")
+    
+    result = strategy.validate(args)
+    
+    assert not result.valid
+    assert len(result.missing_vars) > 0
+    assert "ANTHROPIC_API_KEY environment variable is not set" in result.missing_vars[0]
+    assert "EXPERT_ANTHROPIC_API_KEY" not in result.missing_vars[0]