diff --git a/tests/test_alpha_vantage_hardening.py b/tests/test_alpha_vantage_hardening.py
index 130d85fd2..6235241e6 100644
--- a/tests/test_alpha_vantage_hardening.py
+++ b/tests/test_alpha_vantage_hardening.py
@@ -151,3 +151,18 @@ def test_request_error_message_carries_no_key(monkeypatch):
     with pytest.raises(requests.Timeout) as caught:
         av._make_api_request("OVERVIEW", {"symbol": "IBM"})
     assert key not in str(caught.value)
+
+
+@pytest.mark.unit
+def test_global_news_omitted_optionals_use_the_configured_defaults(monkeypatch):
+    """The tool passes None for an omitted look_back_days or limit (#1326)."""
+    from tradingagents.dataflows import alpha_vantage_news
+
+    monkeypatch.setattr(alpha_vantage_news, "get_config",
+                        lambda: {"global_news_lookback_days": 3, "global_news_article_limit": 9})
+    seen = {}
+    monkeypatch.setattr(alpha_vantage_news, "_make_api_request", lambda fn, params: seen.update(params) or "{}")
+
+    alpha_vantage_news.get_global_news("2026-08-14", None, None)
+
+    assert seen["time_from"].startswith("20260811") and seen["limit"] == "9"
diff --git a/tradingagents/dataflows/alpha_vantage_news.py b/tradingagents/dataflows/alpha_vantage_news.py
index 233739b1b..4431eadc1 100644
--- a/tradingagents/dataflows/alpha_vantage_news.py
+++ b/tradingagents/dataflows/alpha_vantage_news.py
@@ -1,6 +1,7 @@
 import json
 
 from .alpha_vantage_common import _make_api_request, format_datetime_for_api
+from .config import get_config
 
 
 def get_news(ticker, start_date, end_date) -> dict[str, str] | str:
@@ -25,22 +26,29 @@ def get_news(ticker, start_date, end_date) -> dict[str, str] | str:
 
     return _make_api_request("NEWS_SENTIMENT", params)
 
-def get_global_news(curr_date, look_back_days: int = 7, limit: int = 50) -> dict[str, str] | str:
+def get_global_news(curr_date, look_back_days: int | None = None, limit: int | None = None) -> dict[str, str] | str:
     """Returns global market news & sentiment data without ticker-specific filtering.
 
     Covers broad market topics like financial markets, economy, and more.
 
     Args:
         curr_date: Current date in yyyy-mm-dd format.
-        look_back_days: Number of days to look back (default 7).
-        limit: Maximum number of articles (default 50).
+        look_back_days: Number of days to look back; ``None`` uses
+            ``global_news_lookback_days`` from the active config.
+        limit: Maximum number of articles; ``None`` uses
+            ``global_news_article_limit`` from the active config.
 
     Returns:
         Dictionary containing global news sentiment data or JSON string.
     """
     from datetime import datetime, timedelta
 
-    # Calculate start date
+    config = get_config()
+    if look_back_days is None:
+        look_back_days = config["global_news_lookback_days"]
+    if limit is None:
+        limit = config["global_news_article_limit"]
+
     curr_dt = datetime.strptime(curr_date, "%Y-%m-%d")
     start_dt = curr_dt - timedelta(days=look_back_days)
     start_date = start_dt.strftime("%Y-%m-%d")