Production-grade n8n workflow that detects when an AI agent reaches the boundaries of its knowledge and automatically escalates to a human agent. The AI responds with a trigger phrase (ESCALATE_TO_HUMAN) when it cannot handle a request — an IF node detects it using contains logic with case-insensitive comparison, sends a holding message to the user, and simultaneously notifies the human agent with the session ID and original message. FALSE branch delivers the normal AI response untouched. Built from a real production WhatsApp AI system handling live customer conversations.