AI-powered Gmail customer support with OpenRouter & Pinecone knowledge base

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Important notice

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

1. Workflow Overview

This workflow automates customer email support by combining Gmail, AI classification, and a knowledge base to provide instant, accurate, and friendly responses. It’s designed for businesses that wa...

Best for

Support Chatbot automation workflows
AI Chatbot automation workflows
advanced n8n builders looking for reusable templates

Tools used

n8n-nodes-base.gmailtrigger, @n8n/n8n-nodes-langchain.textclassifier, @n8n/n8n-nodes-langchain.lmchatopenrouter, n8n-nodes-base.noop, @n8n/n8n-nodes-langchain.agent, @n8n/n8n-nodes-langchain.vectorstorepinecone, @n8n/n8n-nodes-langchain.embeddingsopenai, n8n-nodes-base.gmail

Source and attribution

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

Original n8n.io source

1.1 Workflow description

Title: AI-powered Gmail customer support with OpenRouter & Pinecone knowledge base
Workflow name: AI-powered Gmail customer support with OpenRouter & Pinecone knowledge base

This workflow automates customer email support by combining Gmail, AI classification, and a knowledge base to provide instant, accurate, and friendly responses. It’s designed for businesses that want to improve customer satisfaction while reducing manual workload.

🚀 How it Works

Gmail Trigger
The workflow listens for new incoming Gmail messages.
Text Classification
Each email is classified using AI as either Customer Support or Other.
- If it’s Other, the workflow stops.
- If it’s Customer Support, the email continues to the AI agent.
AI Agent with Knowledge Base
The AI agent:
- Reads the customer’s message.
- Searches the Pinecone Knowledge Base for FAQs and policies.
- Generates a helpful, polite, and detailed reply using an OpenRouter model.
- Signs off as Mrs. Helpful from Tech Haven Solutions.
Reply to Gmail
The drafted email is automatically sent back to the customer.

💡 Value

✅ Save Time – No more manual triaging and drafting of replies.
✅ Consistency – Every answer is based on your own FAQ/policies.
✅ Customer Satisfaction – Fast, friendly, and accurate responses 24/7.
✅ Scalable – Handle higher email volume without scaling headcount.

🔑 Credentials Needed

To use this workflow, connect the following accounts:

Gmail OAuth2 → for receiving and sending emails.
OpenRouter API → for text classification and AI-generated replies.
OpenAI API → for embeddings (to connect FAQs with AI).
Pinecone API → for storing and retrieving knowledge base content.

🛠 Example Use Case

A customer writes:

> “Hi, I placed an order last week but haven’t received a shipping confirmation yet. Can you check the status?”

The workflow will:

Detect it’s a support-related email.
Retrieve order policy information from the knowledge base.
Generate a friendly response explaining order tracking steps.
Automatically reply to the customer in Gmail.

⚡️ Setup Instructions

Import this workflow into your n8n instance.
Connect your Gmail, OpenRouter, OpenAI, and Pinecone credentials.
Populate your Pinecone knowledge base with FAQs and policies.
Activate the workflow.

From now on, all support-related emails will be automatically answered by your AI-powered support agent.

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 - Gmail Trigger

Type / Role: n8n-nodes-base.gmailTrigger - gmailTrigger
Config choices: Version 1.2

Block 2 - Text Classifier

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

Block 3 - OpenRouter Chat Model

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

Block 4 - No Operation, do nothing

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

Block 5 - AI Agent

Type / Role: @n8n/n8n-nodes-langchain.agent - agent
Config choices: Version 2.1

Block 6 - OpenRouter Chat Model1

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

Block 7 - knowledgeBase

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

Block 8 - Embeddings OpenAI

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

Block 9 - Reply to a message

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

Block 10 - Sticky Note

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

Block 11 - Sticky Note1

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

Block 12 - Sticky Note2

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

Block 13 - Sticky Note3

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

Block 14 - Sticky Note4

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

Block 15 - Sticky Note5

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

3. Summary Table

Workflow	AI-powered Gmail customer support with OpenRouter & Pinecone knowledge base
Complexity	advanced
Nodes	15
Categories	Support Chatbot, AI Chatbot
Author	Emilio Loewenstein
Published	09 Oct 2025

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/9414/9414.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 Support Chatbot workflows AI Chatbot workflows

Frequently asked questions

What does AI-powered Gmail customer support with OpenRouter & Pinecone knowledge base 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 Support Chatbot, AI Chatbot use case.

Emilio Loewenstein

3 workflows

Nodes

n8n-nodes-base.gmailtrigger @n8n/n8n-nodes-langchain.textclassifier @n8n/n8n-nodes-langchain.lmchatopenrouter n8n-nodes-base.noop @n8n/n8n-nodes-langchain.agent @n8n/n8n-nodes-langchain.vectorstorepinecone @n8n/n8n-nodes-langchain.embeddingsopenai n8n-nodes-base.gmail

Complexity

advanced

Published 09 Oct 2025

Likes 0

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Install path: /data/workflows/9414/9414.json

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AI-powered Gmail customer support with OpenRouter & Pinecone knowledge base

Workflow preview

Important notice

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

🚀 How it Works

💡 Value

🔑 Credentials Needed

🛠 Example Use Case

⚡️ Setup Instructions

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - Gmail Trigger

Block 2 - Text Classifier

Block 3 - OpenRouter Chat Model

Block 4 - No Operation, do nothing

Block 5 - AI Agent

Block 6 - OpenRouter Chat Model1

Block 7 - knowledgeBase

Block 8 - Embeddings OpenAI

Block 9 - Reply to a message

Block 10 - Sticky Note

Block 11 - Sticky Note1

Block 12 - Sticky Note2

Block 13 - Sticky Note3

Block 14 - Sticky Note4

Block 15 - Sticky Note5

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