# Draft Gmail replies with OpenAI and OpenRouter: n8n workflow

> Started by an arriving email, and works across Gmail, Supabase vectors and Telegram. It puts OpenAI and OpenRouter behind a retrieval step, so answers are...

Source: https://millionrounds.com/workflow/draft-gmail-replies-with-openai-and-openrouter (Millionrounds; every figure on the page links to its filing or article)

[Automation library](https://millionrounds.com/workflows) · [Chat assistants](https://millionrounds.com/workflows?category=Chat+assistants#library)

# Draft Gmail replies with OpenAI and OpenRouter

Started by an arriving email, and works across Gmail, Supabase vectors and Telegram. It puts OpenAI and OpenRouter behind a retrieval step, so answers are drawn from documents you supply rather than from the model alone. 15 steps, 1 branch: a working afternoon to understand properly.

Medium Calls a model: OpenAI, OpenRouter Retrieval

[Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fdraft-gmail-replies-with-openai-and-openrouter)

**15 steps** Medium: a working afternoon

**1** Branch: places the flow splits

**0** Loops or waits

**3** Services it connects to

## The flow

Starts it 1 Model 9 Logic 2 Service 3

The steps in the order they run, from what starts it.

- 1 **Gmail Trigger** Gmail trigger *Starts it*
- 2 **OpenAI Chat Model** Lm Chat Open Ai *Model*
- 3 **OpenAI Chat Model1** Lm Chat Open Ai *Model*
- 4 **Embeddings OpenAI** Embeddings Open Ai *Model*
- 5 **createDraft** Gmail Tool *Service*
- 6 **OpenRouter Chat Model** Lm Chat Open Router *Model*
- 7 **Structured Output Parser** Output Parser Structured *Model*
- 8 **Set Content** Set *Logic*
- 9 **Email Draft Agent** Agent *Model*
- 10 **Vector Store Tool** Tool Vector Store *Model*
- 11 **Vector Storage** Vector Store Supabase *Model*
- 12 **Client/Prospect Related?** Chain Llm *Model*
- 13 **Response** Telegram *Service*
- 14 **Customer Support?** Switch *Logic*
- 15 **Response Not Customer Support** Telegram *Service*

## How it's built

- **Starts on:** An arriving email
- **Steps:** 15, with 1 branch
- **Size:** Medium: a working afternoon
- **Connects to:** Gmail, Supabase vectors, Telegram
- **Model:** OpenAI, OpenRouter
- **Retrieval:** Answers are drawn from documents you supply, not from the model alone

## Questions

What does it need to run?

An n8n account, plus your own Gmail, Supabase vectors and Telegram accounts, and a key for OpenAI and OpenRouter. You connect your own accounts after importing it; none are included.

What starts it?

It starts on an arriving email.

Does it use AI?

Yes. It calls OpenAI and OpenRouter. Its answers draw on documents you give it, not on the model alone. Model calls are billed by the provider, not by n8n.

How long does it take to set up?

Plan an afternoon. 15 steps is enough that you should read each one before running it.

How do I import it?

Copy the workflow, open a new workflow in n8n and paste. The steps appear on the canvas, ready for your own accounts.

**Before you run it**

Nothing here has been tested by us. It is somebody's working automation, read and described from its own steps. Treat the connections it wants as a list of accounts it will touch, and read the 15 steps before you point it at anything that matters.

## Run it in n8n

- **Create your n8n account** Free to start. n8n is where the workflow runs. [Create an n8n account ↗](https://millionrounds.com/n8n)
- **Download the workflow** Free with a Millionrounds account. [Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fdraft-gmail-replies-with-openai-and-openrouter)
- **Paste it into n8n** Open a new workflow in n8n and paste. Then connect your own accounts.

Stored with the author's traces removed: canvas notes, instance identifiers, saved credential names and any live document they had left behind.

## Connects to

Each opens the other workflows that use it.

[Gmail](https://millionrounds.com/workflows?service=Gmail#library)[Supabase vectors](https://millionrounds.com/workflows?service=Supabase+vectors#library)[Telegram](https://millionrounds.com/workflows?service=Telegram#library)

## Workflows like it

Also chat assistants, with the same services where possible, closest in size first.

- [**AI-powered Telegram & WhatsApp Business agent workflow** 15 steps · calls a model · Google Sheets, Telegram](https://millionrounds.com/workflow/ai-powered-telegram-and-whatsapp-business-agent-workflow)
- [**Agentic RAG assistant: Telegram-based knowledge orchestration** 15 steps · calls a model · Google Drive, Pinecone](https://millionrounds.com/workflow/agentic-rag-assistant-telegram-based-knowledge-orchestration)
- [**Analyze stocks from Telegram with OpenAI and TwelveData** 15 steps · calls a model · Telegram](https://millionrounds.com/workflow/analyze-stocks-from-telegram-with-openai-and-twelvedata)
- [**Analyze stocks with Telegram and OpenAI** 15 steps · calls a model · Telegram](https://millionrounds.com/workflow/analyze-stocks-with-telegram-and-openai)
- [**Automate Client Onboarding with Asana and Slack** 15 steps · calls a model · Asana, Gmail](https://millionrounds.com/workflow/automate-client-onboarding-with-asana-and-slack)
- [**Automate email responses with OpenAI and Telegram** 15 steps · calls a model · Gmail, Telegram](https://millionrounds.com/workflow/automate-email-responses-with-openai-and-telegram)