n8n AI/LLM Cluster Node System

n8n integrates with LangChain to provide advanced AI capabilities via a cluster node architecture — root nodes connected to specialized sub-nodes through typed connectors. Requires n8n v1.19.4+.

Quick Reference

Cluster Node Architecture

AI workflows in n8n use root nodes (agents, chains) connected to sub-nodes (models, memory, tools) through typed AI connectors. Root nodes NEVER work alone — they ALWAYS require at least one Chat Model sub-node.

┌─────────────────────────────────────────────────┐
│  ROOT NODE (Agent/Chain)                        │
│  ┌──────────┬──────────┬──────────┬───────────┐ │
│  │ai_language│ai_memory │ai_tool   │ai_output  │ │
│  │Model     │          │          │Parser     │ │
│  └────┬─────┴────┬─────┴────┬─────┴─────┬─────┘ │
└───────┼──────────┼──────────┼───────────┼───────┘
        │          │          │           │