Automated customer support with GPT-4 knowledge base agent for Gmail

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Important notice

This workflow is provided as-is. Please review and test before using in production.

1. Workflow Overview

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 an...

Best for

AI RAG automation workflows
advanced n8n builders looking for reusable templates

Tools used

@n8n/n8n-nodes-langchain.textclassifier, @n8n/n8n-nodes-langchain.lmchatopenai, @n8n/n8n-nodes-langchain.agent, @n8n/n8n-nodes-langchain.embeddingsopenai, @n8n/n8n-nodes-langchain.vectorstorepinecone, n8n-nodes-base.gmail, n8n-nodes-base.noop, n8n-nodes-base.googledrivetrigger

Source and attribution

This workflow is cataloged by N8N Workflows and links back to its original n8n.io source page by Yasser Sami.

Original n8n.io source

1.1 Workflow description

Title: Automated customer support with GPT-4 knowledge base agent for Gmail
Workflow name: Automated customer support with GPT-4 knowledge base agent for Gmail

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

Trigger: A new email arrives in Gmail.
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.
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).
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

Import this template into your n8n account.
Connect your Gmail account in the Gmail Trigger, Label, and Reply nodes.
Connect your AI model provider (OpenAI or Google Gemini).
Configure the knowledge base embeddings (upload your docs/FAQ into the vector database).
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.

1.2 Logical Blocks

This catalog entry is organized from the workflow JSON. The node-level section below shows the executable blocks available for review before importing the template.

2. Block-by-Block Analysis

Block 1 - Text Classifier

Type / Role: @n8n/n8n-nodes-langchain.textClassifier - textClassifier
Config choices: Version 1.1

Block 2 - OpenAI Chat Model

Type / Role: @n8n/n8n-nodes-langchain.lmChatOpenAi - lmChatOpenAi
Config choices: Version 1.2

Block 3 - AI Agent

Type / Role: @n8n/n8n-nodes-langchain.agent - agent
Config choices: Version 2.2

Block 4 - Embeddings OpenAI

Type / Role: @n8n/n8n-nodes-langchain.embeddingsOpenAi - embeddingsOpenAi
Config choices: Version 1.2

Block 5 - knowledgebase

Type / Role: @n8n/n8n-nodes-langchain.vectorStorePinecone - vectorStorePinecone
Config choices: Version 1.3

Block 6 - Reply to a message

Type / Role: n8n-nodes-base.gmail - gmail
Config choices: Version 2.1

Block 7 - Add label to message

Type / Role: n8n-nodes-base.gmail - gmail
Config choices: Version 2.1

Block 8 - No Operation, do nothing

Type / Role: n8n-nodes-base.noOp - noOp
Config choices: Version 1

Block 9 - Google Drive Trigger

Type / Role: n8n-nodes-base.googleDriveTrigger - googleDriveTrigger
Config choices: Version 1

Block 10 - Download file

Type / Role: n8n-nodes-base.googleDrive - googleDrive
Config choices: Version 3

Block 11 - Pinecone Vector Store

Type / Role: @n8n/n8n-nodes-langchain.vectorStorePinecone - vectorStorePinecone
Config choices: Version 1.3

Block 12 - Default Data Loader

Type / Role: @n8n/n8n-nodes-langchain.documentDefaultDataLoader - documentDefaultDataLoader
Config choices: Version 1.1

Block 13 - Recursive Character Text Splitter

Type / Role: @n8n/n8n-nodes-langchain.textSplitterRecursiveCharacterTextSplitter - textSplitterRecursiveCharacterTextSplitter
Config choices: Version 1

Block 14 - Embeddings OpenAI1

Type / Role: @n8n/n8n-nodes-langchain.embeddingsOpenAi - embeddingsOpenAi
Config choices: Version 1.2

Block 15 - Sticky Note1

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 16 - Gmail Trigger

Type / Role: n8n-nodes-base.gmailTrigger - gmailTrigger
Config choices: Version 1.3

Block 17 - Sticky Note2

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 18 - Sticky Note

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 19 - Sticky Note3

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 20 - OpenAI Chat Model1

Type / Role: @n8n/n8n-nodes-langchain.lmChatOpenAi - lmChatOpenAi
Config choices: Version 1.2

Block 21 - Sticky Note4

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

3. Summary Table

Workflow	Automated customer support with GPT-4 knowledge base agent for Gmail
Complexity	advanced
Nodes	21
Categories	AI RAG
Author	Yasser Sami
Published	01 Oct 2025

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/9161/9161.json as the source template for this automation.
2. Import the template into n8n

Open n8n, import the downloaded JSON, and review each node before activating the workflow.
3. Configure credentials and variables

Replace placeholder credentials, API keys, webhook URLs, account IDs, and environment-specific values with your own settings.
4. Test with sample data

Run the workflow manually or in a staging workspace, inspect node output, and confirm downstream systems receive the expected data.
5. Activate and monitor

Enable the workflow only after testing, then monitor executions, errors, and rate limits during the first production runs.

5. General Notes & Resources

Review imported nodes carefully before activation. This catalog entry is intended to help you inspect the workflow structure, understand required services, and find related templates faster.

Node names, credentials, schedules, webhook paths, and external service limits may need adjustment for your workspace.

Download workflow JSON Original n8n.io source AI RAG workflows

Frequently asked questions

What does Automated customer support with GPT-4 knowledge base agent for Gmail do?

What do I need before importing this workflow?

Review the workflow JSON, configure any required credentials in n8n, and test the automation in a safe workspace before using it in production.

Can I customize this workflow?

Yes. Use the block-by-block analysis and the downloadable JSON to inspect each node, then adjust credentials, prompts, schedules, filters, or destinations for your AI RAG use case.

Yasser Sami

17 workflows

Nodes

@n8n/n8n-nodes-langchain.textclassifier @n8n/n8n-nodes-langchain.lmchatopenai @n8n/n8n-nodes-langchain.agent @n8n/n8n-nodes-langchain.embeddingsopenai @n8n/n8n-nodes-langchain.vectorstorepinecone n8n-nodes-base.gmail n8n-nodes-base.noop n8n-nodes-base.googledrivetrigger

Complexity

advanced

Published 01 Oct 2025

Likes 0

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Install path: /data/workflows/9161/9161.json

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Automated customer support with GPT-4 knowledge base agent for Gmail

Workflow preview

Important notice

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

Customer Support AI Agent for Gmail

Who’s it for

How it works / What it does

How to set up

Requirements

How to customize the workflow

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - Text Classifier

Block 2 - OpenAI Chat Model

Block 3 - AI Agent

Block 4 - Embeddings OpenAI

Block 5 - knowledgebase

Block 6 - Reply to a message

Block 7 - Add label to message

Block 8 - No Operation, do nothing

Block 9 - Google Drive Trigger

Block 10 - Download file

Block 11 - Pinecone Vector Store

Block 12 - Default Data Loader

Block 13 - Recursive Character Text Splitter

Block 14 - Embeddings OpenAI1

Block 15 - Sticky Note1

Block 16 - Gmail Trigger

Block 17 - Sticky Note2

Block 18 - Sticky Note

Block 19 - Sticky Note3

Block 20 - OpenAI Chat Model1

Block 21 - Sticky Note4

3. Summary Table

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

2. Import the template into n8n

3. Configure credentials and variables

4. Test with sample data

5. Activate and monitor

5. General Notes & Resources

Frequently asked questions