Automated Facebook comment management with GPT-4o and LangChain

Facebook AI Agent with MCP Server – Built for Smart Engagement and Automation Hi! I’m Amanda 🥰😘 — I build intelligent automations with n8n and Make. This powerful workflow was designed to help teams automatically handle Facebook page interactions with AI. Using Meta Graph API, LangChain, MCP Server, and GPT-4o, it allows your AI agent to search for posts, read captions, fetch comments, and even reply or message followers, all through structured tools. --- 🔧 What the workflow does - Searches for recent media using Facebook Page ID and access token - Reads and extracts captions or media URLs - Fetches comments and specific replies from each post - Replies to comments automatically with GPT-generated responses - Sends direct messages to followers who commented - Maps user input and session to keep memory context via LangChain - Communicates via Server-Sent Events (SSE) using your MCP Server URL --- 🧰 Nodes & Tech Used - LangChain Agent + Chat Model with GPT-4o - Memory Buffer for session memory - toolHttpRequest to search media, comments, and send replies - MCP Trigger and MCP Tool (custom SSE connection) - Set node for input and variable assignment - Webhook and JSON for Facebook API structure --- ⚙️ Setup Instructions 1. Create your Facebook App in Meta Developer Portal 2. Add your Facebook Page ID and Access Token in the Set node 3. Update the MCP Server Tool URL in the MCP Facebook node - Use your n8n server URL (e.g. 4. Trigger the workflow using the included LangChain Chat Trigger 5. Interact via text to ask the agent to: - “Get latest posts” - “Reply to comment X with this message” - “Send DM to this user about...” --- 👥 Who this is for - Social media teams managing multiple Facebook pages - Brands automating engagement with followers - Agencies creating smart, autonomous digital assistants - Developers building conversational bots for Facebook --- ✅ Requirements - Meta Graph API access - Facebook Page (with permissions) - n8n instance (Cloud or Self-hosted) - MCP Server configured (SSE Endpoint enabled) - OpenAI API Key (for GPT-4o + LangChain) --- 🌐 Want to use this workflow? ❤️ Buy workflows: ☁️ Try n8n Cloud: