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packages/@n8n/nodes-langchain/nodes/agents/Agent/Agent.node.ts

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+import type { INodeTypeBaseDescription, IVersionedNodeType } from 'n8n-workflow';
+import { VersionedNodeType } from 'n8n-workflow';
+
+import { AgentV1 } from './V1/AgentV1.node';
+import { AgentV2 } from './V2/AgentV2.node';
+import { AgentV3 } from './V3/AgentV3.node';
+
+export class Agent extends VersionedNodeType {
+	constructor() {
+		const baseDescription: INodeTypeBaseDescription = {
+			displayName: 'AI Agent',
+			name: 'agent',
+			icon: 'fa:robot',
+			iconColor: 'black',
+			group: ['transform'],
+			description: 'Generates an action plan and executes it. Can use external tools.',
+			codex: {
+				alias: ['LangChain', 'Chat', 'Conversational', 'Plan and Execute', 'ReAct', 'Tools'],
+				categories: ['AI'],
+				subcategories: {
+					AI: ['Agents', 'Root Nodes'],
+				},
+				resources: {
+					primaryDocumentation: [
+						{
+							url: 'https://docs.n8n.io/integrations/builtin/cluster-nodes/root-nodes/n8n-nodes-langchain.agent/',
+						},
+					],
+				},
+			},
+			defaultVersion: 3.1,
+			builderHint: {
+				relatedNodes: [
+					{
+						nodeType: 'n8n-nodes-base.aggregate',
+						relationHint: 'Use to combine multiple items together before the agent',
+					},
+					{
+						nodeType: '@n8n/n8n-nodes-langchain.outputParserStructured',
+						relationHint:
+							'Attach for structured output; reference fields as $json.output.fieldName for use in subsequent nodes (conditions, storing data)',
+					},
+					{
+						nodeType: '@n8n/n8n-nodes-langchain.agentTool',
+						relationHint: 'For multi-agent systems using orchestrator pattern',
+					},
+					{
+						nodeType: '@n8n/n8n-nodes-langchain.memoryBufferWindow',
+						relationHint:
+							'Required for conversational workflows - connect memory to every agent that needs to recall previous messages in the conversation',
+					},
+				],
+			},
+		};
+
+		const nodeVersions: IVersionedNodeType['nodeVersions'] = {
+			1: new AgentV1(baseDescription),
+			1.1: new AgentV1(baseDescription),
+			1.2: new AgentV1(baseDescription),
+			1.3: new AgentV1(baseDescription),
+			1.4: new AgentV1(baseDescription),
+			1.5: new AgentV1(baseDescription),
+			1.6: new AgentV1(baseDescription),
+			1.7: new AgentV1(baseDescription),
+			1.8: new AgentV1(baseDescription),
+			1.9: new AgentV1(baseDescription),
+			2: new AgentV2(baseDescription),
+			2.1: new AgentV2(baseDescription),
+			2.2: new AgentV2(baseDescription),
+			2.3: new AgentV2(baseDescription),
+			3: new AgentV3(baseDescription),
+			3.1: new AgentV3(baseDescription),
+			// IMPORTANT Reminder to update AgentTool
+		};
+
+		super(nodeVersions, baseDescription);
+	}
+}