feat: Add AI tool building capabilities (#7336)

Github issue / Community forum post (link here to close automatically):
https://community.n8n.io/t/langchain-memory-chat/23733

---------

Signed-off-by: Oleg Ivaniv <me@olegivaniv.com>
Co-authored-by: Oleg Ivaniv <me@olegivaniv.com>
Co-authored-by: Val <68596159+valya@users.noreply.github.com>
Co-authored-by: Alex Grozav <alex@grozav.com>
Co-authored-by: कारतोफ्फेलस्क्रिप्ट™ <aditya@netroy.in>
Co-authored-by: Deborah <deborah@starfallprojects.co.uk>
Co-authored-by: Jesper Bylund <mail@jesperbylund.com>
Co-authored-by: Jon <jonathan.bennetts@gmail.com>
Co-authored-by: Michael Kret <88898367+michael-radency@users.noreply.github.com>
Co-authored-by: Giulio Andreini <andreini@netseven.it>
Co-authored-by: Mason Geloso <Mason.geloso@gmail.com>
Co-authored-by: Mason Geloso <hone@Masons-Mac-mini.local>
Co-authored-by: Mutasem Aldmour <mutasem@n8n.io>

packages/@n8n/nodes-langchain/nodes/document_loaders/DocumentGithubLoader/DocumentGithubLoader.node.ts

@@ -0,0 +1,125 @@
+/* eslint-disable n8n-nodes-base/node-dirname-against-convention */
+import {
+	NodeConnectionType,
+	type IExecuteFunctions,
+	type INodeType,
+	type INodeTypeDescription,
+	type SupplyData,
+} from 'n8n-workflow';
+import { GithubRepoLoader } from 'langchain/document_loaders/web/github';
+import type { CharacterTextSplitter } from 'langchain/text_splitter';
+import { logWrapper } from '../../../utils/logWrapper';
+import { getConnectionHintNoticeField } from '../../../utils/sharedFields';
+
+export class DocumentGithubLoader implements INodeType {
+	description: INodeTypeDescription = {
+		displayName: 'GitHub Document Loader',
+		name: 'documentGithubLoader',
+		icon: 'file:github.svg',
+		group: ['transform'],
+		version: 1,
+		description: 'Use GitHub data as input to this chain',
+		defaults: {
+			name: 'GitHub Document Loader',
+		},
+		codex: {
+			categories: ['AI'],
+			subcategories: {
+				AI: ['Document Loaders'],
+			},
+			resources: {
+				primaryDocumentation: [
+					{
+						url: 'https://docs.n8n.io/integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.documentgithubloader/',
+					},
+				],
+			},
+		},
+		credentials: [
+			{
+				name: 'githubApi',
+				required: true,
+			},
+		],
+		// eslint-disable-next-line n8n-nodes-base/node-class-description-inputs-wrong-regular-node
+		inputs: [
+			{
+				displayName: 'Text Splitter',
+				maxConnections: 1,
+				type: NodeConnectionType.AiTextSplitter,
+			},
+		],
+		inputNames: ['Text Splitter'],
+		// eslint-disable-next-line n8n-nodes-base/node-class-description-outputs-wrong
+		outputs: [NodeConnectionType.AiDocument],
+		outputNames: ['Document'],
+		properties: [
+			getConnectionHintNoticeField([NodeConnectionType.AiVectorStore]),
+			{
+				displayName: 'Repository Link',
+				name: 'repository',
+				type: 'string',
+				default: '',
+			},
+			{
+				displayName: 'Branch',
+				name: 'branch',
+				type: 'string',
+				default: 'main',
+			},
+			{
+				displayName: 'Options',
+				name: 'additionalOptions',
+				type: 'collection',
+				placeholder: 'Add Option',
+				default: {},
+
+				options: [
+					{
+						displayName: 'Recursive',
+						name: 'recursive',
+						type: 'boolean',
+						default: false,
+					},
+					{
+						displayName: 'Ignore Paths',
+						name: 'recursive',
+						type: 'string',
+						description: 'Comma-separated list of paths to ignore, e.g. "docs, src/tests',
+						default: '',
+					},
+				],
+			},
+		],
+	};
+
+	async supplyData(this: IExecuteFunctions, itemIndex: number): Promise<SupplyData> {
+		console.log('Supplying data for Github Document Loader');
+
+		const repository = this.getNodeParameter('repository', itemIndex) as string;
+		const branch = this.getNodeParameter('branch', itemIndex) as string;
+		const credentials = await this.getCredentials('githubApi');
+		const { ignorePaths, recursive } = this.getNodeParameter('additionalOptions', 0) as {
+			recursive: boolean;
+			ignorePaths: string;
+		};
+
+		const textSplitter = (await this.getInputConnectionData(
+			NodeConnectionType.AiTextSplitter,
+			0,
+		)) as CharacterTextSplitter | undefined;
+
+		const docs = new GithubRepoLoader(repository, {
+			branch,
+			ignorePaths: (ignorePaths ?? '').split(',').map((p) => p.trim()),
+			recursive,
+			accessToken: (credentials.accessToken as string) || '',
+		});
+
+		const loadedDocs = textSplitter ? await docs.loadAndSplit(textSplitter) : await docs.load();
+
+		return {
+			response: logWrapper(loadedDocs, this),
+		};
+	}
+}

packages/@n8n/nodes-langchain/nodes/document_loaders/DocumentGithubLoader/github.svg

@@ -0,0 +1 @@
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