Automation library · Data collection

Protect Gmail AI email workflows from prompt injection

Started by an arriving email, and works across Gmail and Google Sheets. It hands the judgement calls to Gemini. 14 steps, 2 branches: a working afternoon to understand properly.

MediumCalls a model: Gemini

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

The flow

Starts it 1Model 1Logic 7Service 5

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

  1. 1Gmail Trigger: New email for AI safety checkGmail triggerStarts it
  2. 2Set config: Security settingsSetLogic
  3. 3Code: Normalize Gmail messageCodeLogic
  4. 4Code: Detect prompt injection riskCodeLogic
  5. 5IF: Block high-risk emailIfLogic
  6. 6Code: Build blocked audit logCodeLogic
  7. 7Gemini: Safely analyze emailGoogle GeminiModel
  8. 8Sheets: Log blocked emailGoogle SheetsService
  9. 9Code: Parse AI result and finalize riskCodeLogic
  10. 10Gmail: Create manual review draftGmailService
  11. 11Sheets: Log analyzed emailGoogle SheetsService
  12. 12Switch: Route by safety resultSwitchLogic
  13. 13Gmail: Create safe reply draftGmailService
  14. 14Gmail: Create human review draftGmailService

How it's built

Starts on
An arriving email
Steps
14, with 2 branches
Size
Medium: a working afternoon
Connects to
Gmail, Google Sheets
Model
Gemini

Questions

What does it need to run?

An n8n account, plus your own Gmail and Google Sheets accounts, and a key for Gemini. 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 Gemini. Model calls are billed by the provider, not by n8n.

How long does it take to set up?

Plan an afternoon. 14 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 14 steps before you point it at anything that matters.