AI Agent Bites #9: AnswerRank LinkedIn post and image agent

The problem we solve

Creating high-quality LinkedIn content regularly takes time—especially when aiming for posts that are research-backed, visually aligned with your brand, and consistent in tone. We wanted to eliminate the manual work and make the entire process operate from a simple Slack message.

How it works

This week, we built an AI Agent that automates LinkedIn post creation from a Slack channel using n8n to orchestrate the workflow. The agent combines:

Research generation via Sonar (Perplexity API) for accurate topic context
Post copy crafted by GPT-4o in brand voice and LinkedIn tone
Visual assets created using GPT-Image-1 for on-brand representation
Slack integration to deliver and iterate via chat

All of this happens from a single prompt inside Slack. The AI agent handles everything—from research to visuals—then sends back a ready-to-publish LinkedIn post, directly in the thread.

Processing and development

n8n orchestrates API calls between Slack, Sonar, GPT-4o, and GPT-Image-1
Sonar (Perplexity API) runs deep web research to extract current insights
GPT-4o agents format the insights into a concise, engaging LinkedIn post and coordinate the Slack chat
GPT-Image-1 generates visuals tailored to the post topic and tone
Slack API provides chat interface for initiating and reviewing output