Review GitHub pull requests with Gemini and post feedback automatically

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1. Workflow Overview

Review GitHub pull requests with Gemini AI and post feedback automatically Who is this for Development teams and tech leads who want to maintain consistent code quality without manual review bottle...

Best for

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

Tools used

n8n-nodes-base.webhook, n8n-nodes-base.code, n8n-nodes-base.httprequest, @n8n/n8n-nodes-langchain.chainllm, @n8n/n8n-nodes-langchain.lmchatgooglegemini, n8n-nodes-base.googlesheets, n8n-nodes-base.slack, n8n-nodes-base.stickynote

Source and attribution

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

Original n8n.io source

1.1 Workflow description

Title: Review GitHub pull requests with Gemini and post feedback automatically
Workflow name: Review GitHub pull requests with Gemini and post feedback automatically

Review GitHub pull requests with Gemini AI and post feedback automatically

Who is this for

Development teams and tech leads who want to maintain consistent code quality without manual review bottlenecks. Perfect for teams handling multiple PRs daily and wanting AI-powered insights on security, bugs, and best practices.

How it works

When a GitHub pull request is created or updated, the webhook triggers the workflow. The system fetches the PR diff via GitHub API and analyzes each file's changes. Google Gemini AI reviews the code for potential bugs, security vulnerabilities, performance issues, and style improvements.

The AI generates detailed feedback which gets posted as a GitHub review comment. Every review is logged to Google Sheets for tracking, and the team receives a Slack notification with the PR status and summary.

How to set up

GitHub webhook: Configure your repository's webhook to send PR events to the n8n webhook URL
GitHub API: Add a personal access token with repository permissions for API calls
Google credentials: Connect your Gemini AI API key and Google Sheets OAuth
Slack integration: Set up a Slack app with chat:write permissions for team notifications
Sheet setup: Create a Google Sheet and update the document ID in the workflow

Requirements

GitHub repository with webhook access
Google Gemini API account
Google Sheets and Slack workspace
n8n cloud or self-hosted instance

How to customize

Modify the AI prompt in the "Code review" node to focus on your team's specific coding standards. Adjust the review criteria, change notification channels, or add email alerts. Configure different review templates for different repositories by checking the repo name in the webhook data.

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 - GitHub PR webhook

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

Block 2 - Parse PR data

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

Block 3 - Get PR diff

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.1

Block 4 - Analyze diff

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

Block 5 - Code review

Type / Role: @n8n/n8n-nodes-langchain.chainLlm - chainLlm
Config choices: Version 1.4

Block 6 - Google Gemini AI

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

Block 7 - Format review

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

Block 8 - Post GitHub review

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.1

Block 9 - Log to Sheets

Type / Role: n8n-nodes-base.googleSheets - googleSheets
Config choices: Version 4.1

Block 10 - Notify team

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

Block 11 - Overview Sticky

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

Block 12 - Webhook Setup Section

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

Block 13 - Data Analysis Section

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

Block 14 - AI Review Section

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

Block 15 - Results Section

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

3. Summary Table

Workflow	Review GitHub pull requests with Gemini and post feedback automatically
Complexity	advanced
Nodes	15
Categories	Engineering, AI Summarization
Author	Oka Hironobu
Published	20 Feb 2026

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/13563/13563.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 Review GitHub pull requests with Gemini and post feedback automatically 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.

Oka Hironobu

30 workflows

Nodes

n8n-nodes-base.webhook n8n-nodes-base.code n8n-nodes-base.httprequest @n8n/n8n-nodes-langchain.chainllm @n8n/n8n-nodes-langchain.lmchatgooglegemini n8n-nodes-base.googlesheets n8n-nodes-base.slack n8n-nodes-base.stickynote

Complexity

advanced

Published 20 Feb 2026

Likes 0

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Install path: /data/workflows/13563/13563.json

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Review GitHub pull requests with Gemini and post feedback automatically

Workflow preview

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

Review GitHub pull requests with Gemini AI and post feedback automatically

Who is this for

How it works

How to set up

Requirements

How to customize

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - GitHub PR webhook

Block 2 - Parse PR data

Block 3 - Get PR diff

Block 4 - Analyze diff

Block 5 - Code review

Block 6 - Google Gemini AI

Block 7 - Format review

Block 8 - Post GitHub review

Block 9 - Log to Sheets

Block 10 - Notify team

Block 11 - Overview Sticky

Block 12 - Webhook Setup Section

Block 13 - Data Analysis Section

Block 14 - AI Review Section

Block 15 - Results Section

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