# Build a basic RAG chat agent with Gemini and Supabase: n8n workflow

> Started by someone opening a chat with it, and works across Supabase vectors. It puts Gemini behind a retrieval step, so answers are drawn from documents...

Source: https://millionrounds.com/workflow/build-a-basic-rag-chat-agent-with-gemini-and-supabase (Millionrounds; every figure on the page links to its filing or article)

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

# Build a basic RAG chat agent with Gemini and Supabase

Started by someone opening a chat with it, and works across Supabase vectors. It puts Gemini behind a retrieval step, so answers are drawn from documents you supply rather than from the model alone. 10 steps: a working afternoon to understand properly.

Medium Calls a model: Gemini Retrieval

[Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fbuild-a-basic-rag-chat-agent-with-gemini-and-supabase)

**10 steps** Medium: a working afternoon

**0** Branches: places the flow splits

**0** Loops or waits

**1** Service it connects to

## The flow

Starts it 2 Model 7 Service 1

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

- 1 **Default Data Loader** Document Default Data Loader *Model*
- 2 **Simple Memory** Memory Buffer Window *Model*
- 3 **When chat message received** Chat trigger *Starts it*
- 4 **When clicking ‘Execute workflow’** Manual trigger *Starts it*
- 5 **Google Gemini Chat Model** Lm Chat Google Gemini *Model*
- 6 **Embeddings Google Gemini** Embeddings Google Gemini *Model*
- 7 **Supabase Vector Store** Vector Store Supabase *Model*
- 8 **AI Agent** Agent *Model*
- 9 **HTTP Request** Http Request *Service*
- 10 **Retrieve Supabase Vector** Vector Store Supabase *Model*

## How it's built

- **Starts on:** Someone opening a chat with it
- **Steps:** 10
- **Size:** Medium: a working afternoon
- **Connects to:** Supabase vectors
- **Model:** Gemini
- **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 Supabase vectors account, and a key for Gemini. You connect your own accounts after importing it; none are included.

What starts it?

It starts on someone opening a chat with it.

Does it use AI?

Yes. It calls Gemini. 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. 10 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 10 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%2Fbuild-a-basic-rag-chat-agent-with-gemini-and-supabase)
- **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.

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

## Workflows like it

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

- [**Build a RAG-powered AI assistant with OpenAI and Google Drive** 12 steps · calls a model · Google Drive, Supabase vectors](https://millionrounds.com/workflow/build-a-rag-powered-ai-assistant-with-openai-and-google-driv)
- [**Build a multi-knowledge base RAG chat assistant with Supabase** 12 steps · calls a model · Supabase vectors](https://millionrounds.com/workflow/build-a-multi-knowledge-base-rag-chat-assistant-with-supabas)
- [**Create RAG-ready knowledge bases from websites with Apify** 13 steps · calls a model · Supabase vectors](https://millionrounds.com/workflow/create-rag-ready-knowledge-bases-from-websites-with-apify)
- [**Build website Q&A chatbot with OpenAI and Supabase Vector DB** 14 steps · calls a model · Supabase vectors](https://millionrounds.com/workflow/build-website-q-and-a-chatbot-with-openai-and-supabase-vecto)
- [**Answer voice queries from a webhook over Google Drive docs** 15 steps · calls a model · Google Drive, Supabase vectors](https://millionrounds.com/workflow/answer-voice-queries-from-a-webhook-over-google-drive-docs)
- [**Build a Placetel RAG voice assistant with Google Drive** 16 steps · calls a model · Google Drive, Supabase vectors](https://millionrounds.com/workflow/build-a-placetel-rag-voice-assistant-with-google-drive)