Force tool_name=lead_search_tool for:
- combo/set do/phoi do queries
- sale/giam gia/discount queries (set discount_min=1)
- moi nhat/new arrivals (set discovery_mode=new)
- best seller queries (set discovery_mode=best_seller)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>