🧠 n8n Blog Automation Workflow

Automate end-to-end blog post generation for WordPress using LLM agents, structured orchestration, and image generation.

📌 Overview

This workflow auto-generates a complete WordPress blog post using only a few inputs (keywords, number of sections, style, etc.). It orchestrates multiple AI agents to:

• Generate topic-specific outlines
• Write section content
• Edit and polish the final post
• Create metadata
• Optionally generate and upload a featured image
• Publish the post to WordPress in draft status

🛠 Workflow Components

🔁 Trigger

• Form Trigger: A visual form where users input:
  • Keywords
  • Word count
  • Number of sections
  • Writing style
  • Website URL
  • Whether to generate a featured image

🧠 Orchestration Agent

A centralized LangChain agent that coordinates sub-agents:

1. OutlinePlanner – SEO-based Table of Contents generator
2. createSections – Breaks ToC into blog sections
3. SectionsWriter – Writes each section’s content with citations
4. Editor – Refines and assembles sections into a full HTML post
5. MetaInfo – Generates post title, slug, and description
6. ImagePrompt – (optional) AI image prompt and alt text generator

✍️ Writing Flow

1. GetOnlineInfo: Uses OpenRouter to find current Q&A about the keyword
2. OutlinePlanner: Generates a structured blog ToC
3. createSections: Converts ToC to blog section structure
4. SectionsWriter: Writes SEO content with sources
5. Editor: Assembles and edits the full blog HTML
6. MetaInfo: Titles, slugs, meta description
7. ImagePrompt + Image Generator (if enabled):
   • Prompt + alt text
   • Realistic image using OpenAI
   • Upload to WordPress media library
8. Final check: If post is marked as ready, it's published

✅ Output Format

{
  "toc": "table of contents",
  "post_html": "<blog post HTML>",
  "meta_data": {
    "title": "...",
    "slug": "...",
    "description": "..."
  },
  "image_data": {
    "image_prompt": "...",
    "alt_text": "..."
  },
  "ready": true
}

🌐 WordPress Integration

The final blog post and featured image are posted to WordPress using authenticated API calls:

• /wp-json/wp/v2/posts
• /wp-json/wp/v2/media

Posts are published as drafts, with optional featured image and metadata.

🧩 Setup Instructions

1. Required Credentials

• WordPress API credential
• OpenAI API credential
• (Optional) OpenRouter API credential

2. Sub-Workflows (Tool Agents)

Create the following sub-workflows:

• OutlinePlanner
• createSections
• SectionsWriter
• Editor
• MetaInfo
• ImagePrompt

Ensure each workflow accepts a query field as JSON input.

3. Trigger Form

Configure the FormTrigger node with appropriate fields:

• KeyWords
• Word Count
• Number of Sections
• Generate a Featured Image (dropdown: true/false)
• Writing Style
• Website URL

4. Enable LLM Tools

Assign model nodes (e.g., GPT-4.1, GPT-4o-mini) to the respective LangChain agents.

📸 Image Pipeline (Optional)

If "Generate a featured image" is set to true, the following steps occur:

• ImagePrompt: Defines a realistic prompt
• Generate Image: Uses OpenAI API to generate an image
• Resize Image (optional)
• Upload Image to WP
• Update Meta Info
• Set Featured Image

💡 Notes

• All outputs are valid JSON and HTML
• All sources are cited with clickable HTML anchor tags
• Workflow is modular: each tool-agent can be debugged independently
• Blog is styled for SEO, legal accuracy, and professional tone

📷 Screenshot Suggestion

• Add a screenshot of the main orchestration flow + each tool subworkflow for clarity.