# Grade system prompts in Google Sheets with Gemini: n8n workflow

> Started by an event in a connected app, and works across Google Sheets. It hands the judgement calls to Gemini.

Source: https://millionrounds.com/workflow/grade-system-prompts-in-google-sheets-with-gemini (Millionrounds; every figure on the page links to its filing or article)

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

# Grade system prompts in Google Sheets with Gemini

Started by an event in a connected app, and works across Google Sheets. It hands the judgement calls to Gemini. 11 steps: a working afternoon to understand properly.

Medium Calls a model: Gemini

[Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fgrade-system-prompts-in-google-sheets-with-gemini)

**11 steps** Medium: a working afternoon

**0** Branches: places the flow splits

**0** Loops or waits

**1** Service it connects to

## The flow

Starts it 1 Model 6 Logic 2 Service 2

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

- 1 **Start Grading Process** Manual trigger *Starts it*
- 2 **Gemini Candidate Model** Lm Chat Google Gemini *Model*
- 3 **Gemini Grader Model** Lm Chat Google Gemini *Model*
- 4 **Gemini Parser Fixer Model** Lm Chat Google Gemini *Model*
- 5 **Read Prompts from Sheets** Google Sheets *Service*
- 6 **Candidate Evaluation Agent** Agent *Model*
- 7 **Grade Evaluation Agent** Agent *Model*
- 8 **Parse Grade Schema** Output Parser Structured *Model*
- 9 **Limit to Last 10 Prompts** Limit *Logic*
- 10 **Update Grade in Sheets** Google Sheets *Service*
- 11 **Set Sample Grading Task** Set *Logic*

## How it's built

- **Starts on:** An event in a connected app
- **Steps:** 11
- **Size:** Medium: a working afternoon
- **Connects to:** Google Sheets
- **Model:** Gemini

## Questions

What does it need to run?

An n8n account, plus your own Google Sheets account, and a key for Gemini. You connect your own accounts after importing it; none are included.

What starts it?

It starts on an event in a connected app.

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. 11 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 11 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%2Fgrade-system-prompts-in-google-sheets-with-gemini)
- **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.

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

## Workflows like it

Also data collection, with the same services where possible, closest in size first.

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- [**AI multi-source agent with Perplexity Search and Supabase** 11 steps · calls a model · Google Sheets, Supabase vectors](https://millionrounds.com/workflow/ai-multi-source-agent-with-perplexity-search-and-supabase)
- [**AI property location extractor: Google Sheets Gemini AI Google** 11 steps · calls a model · Google Sheets](https://millionrounds.com/workflow/ai-property-location-extractor-google-sheets-gemini-ai-googl)
- [**AI-powered webinar feedback replies with OpenAI** 11 steps · calls a model · Gmail, Google Sheets](https://millionrounds.com/workflow/ai-powered-webinar-feedback-replies-with-openai)
- [**Analyze browsing history and generate automation suggestions** 11 steps · calls a model · Google Sheets](https://millionrounds.com/workflow/analyze-browsing-history-and-generate-automation-suggestions)
- [**Analyze meal photos from LINE with Gemini** 11 steps · calls a model · Google Drive, Google Sheets](https://millionrounds.com/workflow/analyze-meal-photos-from-line-with-gemini)