HM Comment - AI-Powered LinkedIn Comment Generator

Quick Deploy

• Landing Page: Click the button above to deploy to Vercel
• Chrome Extension: See chrome-extension/ folder
• Store Assets: See chrome-store/ folder

---

A Chrome extension + n8n workflow that generates smart, context-aware LinkedIn comment suggestions. Click the HM button on any LinkedIn post and get 3 tailored comment options you can insert with one click.

How It Works

1. Browse your LinkedIn feed as usual
2. Click the HM button that appears on each post's action bar (next to Like, Comment, Share)
3. A modal pops up with 3 AI-generated comment suggestions:
   • Quick: Short, punchy (3-8 words)
   • Medium: Affirms the post's key point with a personal insight (2 sentences max)
   • Detailed: Different angle, personal experience, or contrarian take (2-4 sentences)
4. Click any suggestion to auto-insert it into the LinkedIn comment box
5. Switch tones anytime (Default, Hormozi, Professional, Casual)

What's Included

hm-comment-github/
  chrome-extension/       # The Chrome extension (load into Chrome)
    manifest.json
    background.js
    contentscript.js
    styles.css
    popup.html
    popup.js
  n8n-workflow/           # The n8n automation (import into n8n)
    hm-comment-workflow.json

---

Setup Guide

Prerequisites

• n8n instance (self-hosted or cloud)
• OpenRouter account with API credits
• Google Chrome browser

Step 1: Set Up OpenRouter

1. Go to openrouter.ai and create an account
2. Add credits to your account (the workflow uses claude-haiku-4.5 which is very affordable)
3. Go to Keys and create a new API key
4. Keep this key handy for Step 2

Step 2: Import the n8n Workflow

1. Open your n8n instance
2. Click Add workflow (or the + button)
3. Click the three dots menu (...) in the top right and select Import from file
4. Select n8n-workflow/hm-comment-workflow.json
5. The workflow will load with these nodes:

Webhook -> Prep Data -> Is Default Tone? -> AI Agent (Default Voice) -> Format Response -> Respond to Webhook
                                         -> AI Agent (Other Tones)  ->

Step 3: Add Your OpenRouter Credentials

1. In the imported workflow, double-click the OpenRouter Chat Model node
2. Click the Credential dropdown and select Create New Credential
3. Enter your OpenRouter API key from Step 1
4. Click Save
5. Repeat for the OpenRouter Chat Model1 node (use the same credential)

Step 4: Activate the Workflow

1. Toggle the workflow to Active (top right switch)
2. Note the webhook URL displayed on the Webhook node. It will look like:

   https://your-n8n-instance.com/webhook/hm-comment
   

3. Copy this URL. You'll need it for the Chrome extension.

Step 5: Test the Webhook

Before installing the extension, verify the workflow works. Run this in your terminal:

curl -X POST https://your-n8n-instance.com/webhook/hm-comment \
  -H "Content-Type: application/json" \
  -d '{
    "postText": "Just launched my first SaaS product after 6 months of building. Revenue is small but growing. The hardest part was not the code, it was the marketing.",
    "comments": [],
    "authorName": "John Doe",
    "postType": "text",
    "tone": "default"
  }'

You should get back a JSON response like:

{
  "success": true,
  "data": [
    {"text": "Marketing is the real product.", "type": "short"},
    {"text": "Six months from idea to revenue is solid execution...", "type": "mid"},
    {"text": "The marketing realization hits different when...", "type": "mid"}
  ],
  "error": null
}

Step 6: Install the Chrome Extension

1. Open Chrome and go to chrome://extensions/
2. Enable Developer mode (toggle in the top right)
3. Click Load unpacked
4. Select the chrome-extension/ folder from this repo
5. The HM Comment extension icon will appear in your toolbar

Step 7: Configure the Extension

1. Click the HM Comment icon in your Chrome toolbar
2. Set your Webhook URL to the URL from Step 4
3. Choose your preferred Default Tone
4. Click Save Settings

Step 8: Use It

1. Go to linkedin.com
2. Scroll through your feed
3. You'll see an HM button on each post's action bar
4. Click it, pick a suggestion, done.

---

Customization

Change the AI Model

Edit the model field in both OpenRouter Chat Model nodes. Some options:

Model	Speed	Quality	Cost
anthropic/claude-haiku-4.5	Fast	Good	Low
anthropic/claude-sonnet-4-20250514	Medium	Great	Medium
openai/gpt-4o-mini	Fast	Good	Low
openai/gpt-4o	Medium	Great	Medium

Customize Your Default Voice

Edit the AI Agent - Default Voice node's system message. This is where you define your personal tone of voice. The included prompt uses a conversational, confident style. Replace it with your own writing guidelines.

Add More Tones

1. In the n8n workflow, edit the AI Agent - Other Tones node's system message
2. Add a new When tone is [your-tone]: section with style guidelines
3. In the Chrome extension's popup.html, add a new <option> to the tone selector:

   <option value="your-tone">Your Tone Name</option>

4. Also add it to the tone selector in contentscript.js (search for genie-tone select element)

Adjust Comment Lengths

Edit the text (user prompt) in both AI Agent nodes. The requirements section controls output format:

- Comment 1: Short (3-8 words), punchy and impactful
- Comment 2: Medium (2 sentences max), affirms the post's key point...
- Comment 3: Mid-length (2-4 sentences), different angle...

---

Architecture

LinkedIn Feed (Chrome)
    |
    v
Content Script (contentscript.js)
    |  Scrapes: post text, author, comments, post type
    |  User selects tone
    v
Background Worker (background.js)
    |  POST request to n8n webhook
    v
n8n Workflow
    |  Webhook -> Prep Data -> Route by Tone -> AI Agent -> Format JSON
    v
OpenRouter API
    |  Claude Haiku generates 3 comments
    v
Chrome Extension
    |  Displays suggestions in modal
    |  Click to auto-insert into LinkedIn comment box
    v
LinkedIn Comment Box (auto-filled)

Webhook API

POST https://your-n8n-instance.com/webhook/hm-comment

Request

{
  "postText": "The LinkedIn post text (max 3000 chars)",
  "comments": ["Existing comment 1", "Existing comment 2"],
  "authorName": "Post Author Name",
  "postType": "text|article|image|video|reshare",
  "tone": "default|hormozi|professional|casual"
}

Response

{
  "success": true,
  "data": [
    { "text": "Short comment here", "type": "short" },
    { "text": "Medium comment here...", "type": "mid" },
    { "text": "Longer comment with different angle...", "type": "mid" }
  ],
  "error": null
}

---

Troubleshooting

Issue	Fix
HM button doesn't appear	Reload LinkedIn page. Check chrome://extensions/ for errors.
"Request timed out"	Verify your n8n workflow is active and the webhook URL is correct.
"Webhook returned 500"	Check n8n execution logs. Usually a missing OpenRouter credential.
Comments don't insert	LinkedIn changes their DOM. Click the Comment button manually first, then try HM.
Extension not updating	Remove and re-load the unpacked extension, then hard refresh LinkedIn (Cmd+Shift+R).

License

MIT

Credits

Built with n8n, OpenRouter, and Claude AI.