Auto-respond to Gmail inquiries using OpenAI, Google Sheet & AI agent
Needs changesNeeds changes. This template uses 1 thing(s) that n8n 3.0 removes: AI Agent v1 (old agent modes). 1 breaking item(s) found. Static check, last run 2026-10-19.
What this workflow does
This AI workflow has 9 nodes and runs on Gmail events. Along the way it connects OpenAI Chat Model, Google Sheets and Gmail.
How it runs
Trigger: On Gmail events.
- Inquiry Filter (Text Classifier): classifies text into categories with AI, with model: OpenAI Chat Model
- Reply Generator AI Agent (AI Agent): runs an AI agent, with model: OpenAI Chat Model; 1 tool (Google Sheets Context Retrieval Tool); output parser: Structured Output Parser
- Send Reply to User (Gmail): uses Gmail
- Log Inquiries + Response to Google Sheet (Google Sheets): append
Services it uses
Before you upgrade to n8n 3.0
1 thing in this workflow is removed in n8n 3.0. Fix it before you upgrade:
- AI Agent v1 (old agent modes) in Reply Generator AI Agent (v1.9): replace with Latest AI Agent node (Tools Agent). For SQL Agent, use a Postgres or MySQL tool with a recent AI Agent.
- Also check Gmail Trigger below v1.4 runs as v1.4 (drafts skipped, max emails per poll).
| Removed in 3.0 | Replace with |
|---|---|
| AI Agent v1 (old agent modes) Reply Generator AI Agent (v1.9) | Latest AI Agent node (Tools Agent). For SQL Agent, use a Postgres or MySQL tool with a recent AI Agent. |
Nodes used (8)
- OpenAI Chat Model
@n8n/n8n-nodes-langchain.lmChatOpenAi - Structured Output Parser
@n8n/n8n-nodes-langchain.outputParserStructured - Google Sheets Tool
n8n-nodes-base.googleSheetsTool - Gmail
n8n-nodes-base.gmail - AI Agent
@n8n/n8n-nodes-langchain.agent - Gmail Trigger
n8n-nodes-base.gmailTrigger - Google Sheets
n8n-nodes-base.googleSheets - Text Classifier
@n8n/n8n-nodes-langchain.textClassifier
From the author
Who is this for? This workflow is ideal for: Customer support teams looking to reduce manual response time SaaS companies that frequently receive product inquiries E-commerce stores with common customer questions about orders, shipping, and returns What…