diff --git a/agent/base_agent/base_agent.py b/agent/base_agent/base_agent.py
index 3bcf14f..42c12ba 100644
--- a/agent/base_agent/base_agent.py
+++ b/agent/base_agent/base_agent.py
@@ -538,6 +538,10 @@ Summary:"""
         from tools.general_tools import write_config_value
         write_config_value('TRADING_DAY_ID', trading_day_id)
 
+        # Update context_injector with trading_day_id for MCP tools
+        if self.context_injector:
+            self.context_injector.trading_day_id = trading_day_id
+
         # 6. Run AI trading session
         action_count = 0