Dual-Path Customer Support System with Google Sheets, Vectors & Gemini

This n8n workflow template implements a dual-path architecture for AI customer support, based on the principles outlined in the research paper "A Locally Executable AI System for Improving Preoperative Patient Communication: A Multi-Domain Clinical Evaluation" (Sato et al.).

The system, named LENOHA (Low Energy, No Hallucination, Leave No One Behind Architecture), uses a high-precision classifier to differentiate between high-stakes queries and casual conversation. Queries matching a known FAQ are answered with a pre-approved, verbatim response, structurally eliminating hallucination risk. All other queries are routed to a standard generative LLM for conversational flexibility.

This template provides a practical ++blueprint++ for building safer, more reliable, and cost-efficient AI agents, particularly in regulated or high-stakes domains where factual accuracy is critical.

What This Template Does (Step-by-Step)

• Loads an expert-curated FAQ from Google Sheets and creates a searchable vector store from the questions during a one-time setup flow.
• Receives incoming user queries in real-time via a chat trigger.
• Classifies user intent by converting the query to an embedding and searching the vector store for the most semantically similar FAQ question.
• Routes the query down one of two paths based on a configurable similarity score threshold.
• Responds with a verbatim, pre-approved answer if a match is found (safe path), or generates a conversational reply via an LLM if no match is found (casual path).

Important Note for Production Use

This template uses an in-memory Simple Vector Store for demonstration purposes. For a production application, this should be replaced with a persistent vector database (e.g., Pinecone, Chroma, Weaviate, Supabase) to store your embeddings permanently.

Required Integrations:

• Google Sheets (for the FAQ knowledge base)
• Hugging Face API (for creating embeddings)
• An LLM provider (e.g., OpenAI, Anthropic, Mistral)
• (Recommended) A persistent Vector Store integration.

Best For:

🏦 Organizations in regulated industries (finance, healthcare) requiring high accuracy.
💰 Applications where reducing LLM operational costs is a priority.
⚙️ Technical support agents that must provide precise, unchanging information.
🔒 Systems where auditability and deterministic responses for known issues are required.

Key Benefits:

✅ Structurally eliminates hallucination risk for known topics.
✅ Reduces reliance on expensive generative models for common queries.
✅ Ensures deterministic, accurate, and consistent answers for your FAQ.
✅ Provides high-speed classification via vector search.
✅ Implements a research-backed architecture for building safer AI systems.