Automation library · Documents and files

Build a RAG document chatbot with Supabase and OpenRouter

Started by another system calling it, and works across Google Drive and Supabase vectors. It puts Gemini and OpenRouter 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.

MediumCalls a model: Gemini, OpenRouterRetrieval

10 stepsMedium: a working afternoon
0Branches: places the flow splits
0Loops or waits
2Services it connects to

The flow

Starts it 2Model 7Service 1

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

  1. 1Chat Request WebhookWebhookStarts it
  2. 2OpenRouter LLMLm Chat Open RouterModel
  3. 3Google Drive PDF DownloaderGoogle DriveService
  4. 4Gemini Embedding ModelEmbeddings Google GeminiModel
  5. 5Recursive Text SplitterText Splitter Recursive Character Text SplitterModel
  6. 6RAG Document AssistantAgentModel
  7. 7Supabase Vector StoreVector Store SupabaseModel
  8. 8Supabase Vector RetrieverVector Store SupabaseModel
  9. 9Document LoaderDocument Default Data LoaderModel
  10. 10Return AI ResponseRespond To WebhookStarts it

How it's built

Starts on
Another system calling it
Steps
10
Size
Medium: a working afternoon
Connects to
Google Drive, Supabase vectors
Model
Gemini, 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 Google Drive and Supabase vectors accounts, and a key for Gemini and OpenRouter. You connect your own accounts after importing it; none are included.

What starts it?

It starts on another system calling it.

Does it use AI?

Yes. It calls Gemini 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. 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.