diff --git a/tests/test_google_api_key.py b/tests/test_google_api_key.py
new file mode 100644
index 00000000..e1607c49
--- /dev/null
+++ b/tests/test_google_api_key.py
@@ -0,0 +1,28 @@
+import unittest
+from unittest.mock import patch
+
+from tradingagents.llm_clients.google_client import GoogleClient
+
+
+class TestGoogleApiKeyStandardization(unittest.TestCase):
+    """Verify GoogleClient accepts unified api_key parameter."""
+
+    @patch("tradingagents.llm_clients.google_client.NormalizedChatGoogleGenerativeAI")
+    def test_api_key_handling(self, mock_chat):
+        test_cases = [
+            ("unified api_key is mapped", {"api_key": "test-key-123"}, "test-key-123"),
+            ("legacy google_api_key still works", {"google_api_key": "legacy-key-456"}, "legacy-key-456"),
+            ("unified api_key takes precedence", {"api_key": "unified", "google_api_key": "legacy"}, "unified"),
+        ]
+
+        for msg, kwargs, expected_key in test_cases:
+            with self.subTest(msg=msg):
+                mock_chat.reset_mock()
+                client = GoogleClient("gemini-2.5-flash", **kwargs)
+                client.get_llm()
+                call_kwargs = mock_chat.call_args[1]
+                self.assertEqual(call_kwargs.get("google_api_key"), expected_key)
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/tradingagents/llm_clients/TODO.md b/tradingagents/llm_clients/TODO.md
index d5b5ac9c..f666665d 100644
--- a/tradingagents/llm_clients/TODO.md
+++ b/tradingagents/llm_clients/TODO.md
@@ -5,14 +5,9 @@
 ### 1. `validate_model()` is never called
 - Add validation call in `get_llm()` with warning (not error) for unknown models
 
-### 2. Inconsistent parameter handling
-| Client | API Key Param | Special Params |
-|--------|---------------|----------------|
-| OpenAI | `api_key` | `reasoning_effort` |
-| Anthropic | `api_key` | `thinking_config` → `thinking` |
-| Google | `google_api_key` | `thinking_budget` |
-
-**Fix:** Standardize with unified `api_key` that maps to provider-specific keys
+### 2. ~~Inconsistent parameter handling~~ (Fixed)
+- GoogleClient now accepts unified `api_key` and maps it to `google_api_key`
+- Legacy `google_api_key` still works for backward compatibility
 
 ### 3. `base_url` accepted but ignored
 - `AnthropicClient`: accepts `base_url` but never uses it
diff --git a/tradingagents/llm_clients/google_client.py b/tradingagents/llm_clients/google_client.py
index 7401df0e..f9971aa6 100644
--- a/tradingagents/llm_clients/google_client.py
+++ b/tradingagents/llm_clients/google_client.py
@@ -27,10 +27,15 @@ class GoogleClient(BaseLLMClient):
         """Return configured ChatGoogleGenerativeAI instance."""
         llm_kwargs = {"model": self.model}
 
-        for key in ("timeout", "max_retries", "google_api_key", "callbacks", "http_client", "http_async_client"):
+        for key in ("timeout", "max_retries", "callbacks", "http_client", "http_async_client"):
             if key in self.kwargs:
                 llm_kwargs[key] = self.kwargs[key]
 
+        # Unified api_key maps to provider-specific google_api_key
+        google_api_key = self.kwargs.get("api_key") or self.kwargs.get("google_api_key")
+        if google_api_key:
+            llm_kwargs["google_api_key"] = google_api_key
+
         # Map thinking_level to appropriate API param based on model
         # Gemini 3 Pro: low, high
         # Gemini 3 Flash: minimal, low, medium, high