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Automated Customer Support with GPT-4 Knowledge Base Agent for Gmail

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Created by: Yasser Sami || yassersami

Yasser Sami

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Last update 21 days ago

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Customer Support AI Agent for Gmail

This n8n template demonstrates how to build an AI-powered customer support workflow that automatically handles incoming Gmail messages, classifies them, finds answers from your knowledge base, and sends a personalized reply.

Who’s it for

  • SaaS founders or teams who want to automate customer support.
  • Freelancers and solopreneurs who receive repetitive customer queries.
  • Companies that want to reduce manual email triage and improve response times.

How it works / What it does

  1. Trigger: A new email arrives in Gmail.
  2. Classification: The workflow uses a text classifier to decide whether the email is customer support-related or not.
    • If not, it’s ignored.
    • If yes, it proceeds.
  3. AI Agent:
    • Queries a knowledge base (vector database with OpenAI embeddings).
    • Retrieves the most relevant answer.
    • Drafts a reply using AI (OpenAI or Google Gemini model).
  4. Post-processing:
    • Labels the email in Gmail for organization.
    • Sends a reply automatically.

This ensures that your customers get timely, relevant responses without manual intervention.

How to set up

  1. Import this template into your n8n account.
  2. Connect your Gmail account in the Gmail Trigger, Label, and Reply nodes.
  3. Connect your AI model provider (OpenAI or Google Gemini).
  4. Configure the knowledge base embeddings (upload your docs/FAQ into the vector database).
  5. Activate the workflow — and your AI customer support agent is live!

Requirements

  • n8n account.
  • Gmail account (with API access enabled).
  • OpenAI or Google Gemini account for LLM and embeddings.
  • Knowledge base data (FAQ, documentation, or past tickets).
  • Google Drive account for auto update your vector database(with API access enabled).

How to customize the workflow

  • Knowledge Base: Replace or expand with your own company docs, FAQs, or past conversations.
  • Classification Rules: Train or adjust the classifier to handle more categories (e.g., Sales, Partnership, Technical Support).
  • Reply Style: Customize AI prompts for tone — professional, casual, or friendly.
  • Labels: Change Gmail labels to match your workflow (e.g., “Support,” “Sales,” “Priority”).
  • Multi-language: Add translation steps if your customers speak different languages.

This template saves you hours of manual email triage and ensures your customers always get quick, accurate responses.