fix: preserve exchange-qualified tickers across agent prompts

tradingagents/agents/utils/agent_utils.py

@@ -19,6 +19,16 @@ from tradingagents.agents.utils.news_data_tools import (
     get_global_news
 )
 
+
+def build_instrument_context(ticker: str) -> str:
+    """Describe the exact instrument so agents avoid cross-exchange symbol mixups."""
+    return (
+        f"The exact listed instrument to analyze is `{ticker}`. "
+        "Use this exact ticker in every tool call, report, and recommendation. "
+        "If it includes an exchange suffix such as `.TO`, `.L`, `.HK`, or `.T`, preserve that suffix and do not mix in companies from other exchanges that share the same root symbol. "
+        "If it does not include a suffix, do not invent one."
+    )
+
 def create_msg_delete():
     def delete_messages(state):
         """Clear messages and add placeholder for Anthropic compatibility"""
@@ -35,4 +45,4 @@ def create_msg_delete():
     return delete_messages
 
 
-        
+