Create custom PDF documents from templates with Gemini: n8n workflow

Create custom PDF documents from templates with Gemini

Started by someone opening a chat with it, and works across Google Drive. It puts Gemini behind a retrieval step, so answers are drawn from documents you supply rather than from the model alone. 30 steps, 4 branches: large, and worth reading before you trust it with anything live.

LargeCalls a model: GeminiRetrieval

The flow

Starts it 2Model 9Logic 13Service 6

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

1Google Gemini Chat ModelLm Chat Google GeminiModel
2GetMetaDataHttp Request ToolService
3When chat message receivedChat triggerStarts it
4DocProcessTool WorkflowModel
5Postgres Chat MemoryMemory Postgres ChatModel
6Template ListHttp RequestService
7When Executed by Another WorkflowExecute Workflow triggerStarts it
8Google Gemini Chat Model1Lm Chat Google GeminiModel
9Structured Output ParserOutput Parser StructuredModel
10Google Gemini Chat Model2Lm Chat Google GeminiModel
11DocAgentAgentModel
12User Choice Match CheckChain LlmModel
13Format ControlChain LlmModel
14IfIfLogic
15Formatting CorrectionCodeLogic
16User Choice Match CorrectSetLogic
17User Choice Matching ErrorSetLogic
18CopyTemplateGoogle DriveService
19GetMetaData2Http RequestService
20If1IfLogic
21Edit FieldsSetLogic
22Cop. Document ID Matching ErrorSetLogic
23FillDocumentHttp RequestService
24ifIfLogic
25Generate Download LinkHttp RequestService
26SwitchSwitchLogic
27Download Link FormatSetLogic
28Template Technical ErrorSetLogic
29Incomplete Information ErrorSetLogic
30Other ErrorsSetLogic

How it's built

Starts on: Someone opening a chat with it
Steps: 30, with 4 branches
Size: Large: read it before trusting it with anything live
Connects to: Google Drive
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 Google Drive 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?

Take your time. At 30 steps it is large: read it before trusting it with anything live.

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 30 steps before you point it at anything that matters.