Generate and evaluate AI prompts with Gemini, OpenRouter, Groq, Cohere and Supabase

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1. Workflow Overview

Quick overview This workflow receives a goal via webhook, generates three prompt candidates using Google Gemini, OpenRouter, and Groq, has Cohere evaluate and select the best prompt, then returns t...

Best for

Engineering automation workflows
AI Summarization automation workflows
advanced n8n builders looking for reusable templates

Tools used

n8n-nodes-base.webhook, @n8n/n8n-nodes-langchain.lmchatgooglegemini, @n8n/n8n-nodes-langchain.lmchatopenrouter, @n8n/n8n-nodes-langchain.lmchatgroq, @n8n/n8n-nodes-langchain.lmchatcohere, n8n-nodes-base.supabase, n8n-nodes-base.merge, n8n-nodes-base.respondtowebhook

Source and attribution

This workflow is cataloged by N8N Workflows and links back to its original n8n.io source page by Kanishka Shrivastava.

Original n8n.io source

1.1 Workflow description

Title: Generate and evaluate AI prompts with Gemini, OpenRouter, Groq, Cohere and Supabase
Workflow name: Generate and evaluate AI prompts with Gemini, OpenRouter, Groq, Cohere and Supabase

Quick overview

This workflow receives a goal via webhook, generates three prompt candidates using Google Gemini, OpenRouter, and Groq, has Cohere evaluate and select the best prompt, then returns the result to the caller and stores the goal and winning prompt in Supabase.

How it works

Receives a POST webhook request containing a JSON body with a goal value.
Sends the goal to three parallel prompt-engineering agents backed by Google Gemini, OpenRouter, and Groq to generate creative, marketing, and technical prompt candidates.
Combines the three generated prompt candidates into a single structured payload.
Uses a Cohere-powered evaluator to compare the candidates and return the best prompt (and a reason) as JSON.
Responds to the webhook caller with the evaluator output.
Creates a new row in a Supabase prompts table, saving the original goal and the selected best prompt.

Setup

Add credentials for Google Gemini (PaLM), OpenRouter, Groq, and Cohere so the agents and evaluator can run.
Add your Supabase API credentials and ensure a prompts table exists with fields/columns for goal and best_prompt.
Copy the production webhook URL and send POST requests with { "goal": "..." } from your client or source app.

1.2 Logical Blocks

This catalog entry is organized from the workflow JSON. The node-level section below shows the executable blocks available for review before importing the template.

2. Block-by-Block Analysis

Block 1 - Webhook

Type / Role: n8n-nodes-base.webhook - webhook
Config choices: Version 2.1

Block 2 - Google Gemini Chat Model

Type / Role: @n8n/n8n-nodes-langchain.lmChatGoogleGemini - lmChatGoogleGemini
Config choices: Version 1

Block 3 - OpenRouter Chat Model

Type / Role: @n8n/n8n-nodes-langchain.lmChatOpenRouter - lmChatOpenRouter
Config choices: Version 1

Block 4 - Groq Chat Model

Type / Role: @n8n/n8n-nodes-langchain.lmChatGroq - lmChatGroq
Config choices: Version 1

Block 5 - Cohere Chat Model

Type / Role: @n8n/n8n-nodes-langchain.lmChatCohere - lmChatCohere
Config choices: Version 1

Block 6 - Create a row

Type / Role: n8n-nodes-base.supabase - supabase
Config choices: Version 1

Block 7 - Merge

Type / Role: n8n-nodes-base.merge - merge
Config choices: Version 3.2

Block 8 - Respond to Webhook

Type / Role: n8n-nodes-base.respondToWebhook - respondToWebhook
Config choices: Version 1.5

Block 9 - Creative Prompt Agent

Type / Role: @n8n/n8n-nodes-langchain.agent - agent
Config choices: Version 3.1

Block 10 - Marketing Prompt Agent

Type / Role: @n8n/n8n-nodes-langchain.agent - agent
Config choices: Version 3.1

Block 11 - Technical Prompt Agent

Type / Role: @n8n/n8n-nodes-langchain.agent - agent
Config choices: Version 3.1

Block 12 - Best Prompt Evaluator

Type / Role: @n8n/n8n-nodes-langchain.agent - agent
Config choices: Version 3.1

Block 13 - Extract Goal

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 14 - Combine Agent Outputs

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 15 - Sticky Note

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 16 - Sticky Note1

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 17 - Sticky Note2

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 18 - Sticky Note3

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 19 - Sticky Note4

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 20 - Sticky Note5

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

3. Summary Table

Workflow	Generate and evaluate AI prompts with Gemini, OpenRouter, Groq, Cohere and Supabase
Complexity	advanced
Nodes	20
Categories	Engineering, AI Summarization
Author	Kanishka Shrivastava
Published	02 Jun 2026

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/16063/16063.json as the source template for this automation.
2. Import the template into n8n

Open n8n, import the downloaded JSON, and review each node before activating the workflow.
3. Configure credentials and variables

Replace placeholder credentials, API keys, webhook URLs, account IDs, and environment-specific values with your own settings.
4. Test with sample data

Run the workflow manually or in a staging workspace, inspect node output, and confirm downstream systems receive the expected data.
5. Activate and monitor

Enable the workflow only after testing, then monitor executions, errors, and rate limits during the first production runs.

5. General Notes & Resources

Review imported nodes carefully before activation. This catalog entry is intended to help you inspect the workflow structure, understand required services, and find related templates faster.

Node names, credentials, schedules, webhook paths, and external service limits may need adjustment for your workspace.

Download workflow JSON Original n8n.io source Engineering workflows AI Summarization workflows

Frequently asked questions

What does Generate and evaluate AI prompts with Gemini, OpenRouter, Groq, Cohere and Supabase do?

What do I need before importing this workflow?

Review the workflow JSON, configure any required credentials in n8n, and test the automation in a safe workspace before using it in production.

Can I customize this workflow?

Yes. Use the block-by-block analysis and the downloadable JSON to inspect each node, then adjust credentials, prompts, schedules, filters, or destinations for your Engineering, AI Summarization use case.

Kanishka Shrivastava

5 workflows

Nodes

n8n-nodes-base.webhook @n8n/n8n-nodes-langchain.lmchatgooglegemini @n8n/n8n-nodes-langchain.lmchatopenrouter @n8n/n8n-nodes-langchain.lmchatgroq @n8n/n8n-nodes-langchain.lmchatcohere n8n-nodes-base.supabase n8n-nodes-base.merge n8n-nodes-base.respondtowebhook

Complexity

advanced

Published 02 Jun 2026

Likes 0

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Install path: /data/workflows/16063/16063.json

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Generate and evaluate AI prompts with Gemini, OpenRouter, Groq, Cohere and Supabase

Workflow preview

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

Quick overview

How it works

Setup

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - Webhook

Block 2 - Google Gemini Chat Model

Block 3 - OpenRouter Chat Model

Block 4 - Groq Chat Model

Block 5 - Cohere Chat Model

Block 6 - Create a row

Block 7 - Merge

Block 8 - Respond to Webhook

Block 9 - Creative Prompt Agent

Block 10 - Marketing Prompt Agent

Block 11 - Technical Prompt Agent

Block 12 - Best Prompt Evaluator

Block 13 - Extract Goal

Block 14 - Combine Agent Outputs

Block 15 - Sticky Note

Block 16 - Sticky Note1

Block 17 - Sticky Note2

Block 18 - Sticky Note3

Block 19 - Sticky Note4

Block 20 - Sticky Note5

3. Summary Table

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

2. Import the template into n8n

3. Configure credentials and variables

4. Test with sample data

5. Activate and monitor

5. General Notes & Resources

Frequently asked questions