Building a Production AI Voice Agent with Vapi, LangChain & n8n

The Problem

Restaurants were losing orders and wasting staff time on phone calls.

The Stack I Used

• Vapi → Voice AI
• LangChain + LangGraph → Agent logic & memory
• n8n → Automation workflows
• MCP Server + RAG → Real-time menu & knowledge retrieval with Pinecone

Key Features

• Natural language order taking
• Real-time vector search
• Automatic order storage in Supabase + MySQL
• Full MCP server for context-aware responses

This agent is now live and handling real restaurant orders.