Automated Instagram Comment Replies using Gemini AI with Context-Aware Responses

Instagram Auto-Comment Responder with AI Agent Integration

Version: 1.1.0 ‧ n8n Version: 1.88.0+ ‧ License: MIT

A fully automated workflow for managing and responding to Instagram comments using AI agents. Designed to improve engagement and save time, this system listens for new Instagram comments, verifies and filters them, fetches relevant post data, processes valid messages with a natural language AI, and posts context-aware replies directly on the original post.

Key Features

💬 AI-Driven Engagement: Intelligent responses to comments via a GPT-powered agent. ✅ Webhook Verification: Handles Instagram webhook handshake to ensure secure integration. 📦 Data Extraction: Maps incoming payload fields (user ID, username, message text, media ID) for processing. 🚫 Self-Comment Filtering: Automatically skips comments made by the account owner to prevent loops. 📡 Post Data Retrieval: Fetches the media’s id and caption from the Graph API (v22.0) before generating a reply. 🧠 Natural Language Processing: Uses a custom system prompt to maintain brand tone and context. 🔁 Automated Replies: Posts the AI-generated message back to the comment thread using Instagram’s API. 🧩 Modular Architecture: Clear separation of steps via sticky notes and dedicated HTTP Request and Agent nodes.

Use Cases

Social Media Automation**: Keep followers engaged 24/7 with instant, relevant replies. Community Building**: Maintain a consistent voice and tone across all interactions. Brand Reputation Management**: Ensure no valid comment goes unanswered. AI Customer Support**: Triage simple questions and direct followers to resources or support.

Technical Implementation

Webhook Verification
Node: Webhook + Respond to Webhook
Echoes hub.challenge to confirm subscription and secure incoming events.

Data Extraction
Node: Set
Maps payload fields into structured variables: conta.id, usuario.id, usuario.name, usuario.message.id, usuario.message.text, usuario.media.id, endpoint.

User Validation
Node: Filter
Skips processing if conta.id equals usuario.id (self-comments).

Post Data Retrieval
Node: HTTP Request (Get post data)
GET https://graph.instagram.com/v22.0/{{ $json.usuario.media.id }}?fields=id,caption&access_token={{ credentials }}
Captures the media’s caption for richer context in replies.

AI Response Generation
Nodes: AI Agent + OpenRouter Chat Model
Uses a detailed system prompt with: Profile persona (expert in AI & automations, friendly tone).
Input data (username, comment text, post caption).
Filtering logic (spam, praise, questions, vague comments).
Returns either the reply text or [IGNORE] for irrelevant content.

Posting the Reply
Node: HTTP Request (Post comment)
POST {{ $json.endpoint }}/{{ $json.usuario.message.id }}/replies with message={{ $json.output }}
Sends the AI answer back under the original comment.

Instructions for Setup

Import Workflow
In n8n > Workflows > Import from File, upload the provided .json template.

Configure Credentials
Instagram Graph API (Header Auth or FacebookGraphApi) with instagram_basic, instagram_manage_comments scopes.
OpenRouter/OpenAI API key for AI agent.

Customize System Prompt
Edit the AI Agent’s prompt to adjust brand tone, language (Brazilian Portuguese), length, or emoji usage.

Test & Activate
Publish a test comment on an Instagram post.
Verify each node’s execution, ensuring the webhook, filter, data extraction, HTTP requests, and AI Agent respond as expected.

Extend & Monitor
Add sentiment analysis or lead capture nodes as needed.
Monitor execution logs for errors or rate-limit events.

Tags

Social Media • Instagram Automation • Webhook Verification • AI Agent • HTTP Request • Auto Reply • Community Management