feat(MCP Client Tool Node): Add MCP Client Tool Node to connect to MCP servers over SSE (#14464)

Co-authored-by: कारतोफ्फेलस्क्रिप्ट™ <aditya@netroy.in>
Co-authored-by: JP van Oosten <jp@n8n.io>

packages/@n8n/nodes-langchain/nodes/mcp/McpClientTool/loadOptions.ts

@@ -0,0 +1,32 @@
+import {
+	type ILoadOptionsFunctions,
+	type INodePropertyOptions,
+	NodeOperationError,
+} from 'n8n-workflow';
+
+import type { McpAuthenticationOption } from './types';
+import { connectMcpClient, getAllTools, getAuthHeaders } from './utils';
+
+export async function getTools(this: ILoadOptionsFunctions): Promise<INodePropertyOptions[]> {
+	const authentication = this.getNodeParameter('authentication') as McpAuthenticationOption;
+	const sseEndpoint = this.getNodeParameter('sseEndpoint') as string;
+	const node = this.getNode();
+	const { headers } = await getAuthHeaders(this, authentication);
+	const client = await connectMcpClient({
+		sseEndpoint,
+		headers,
+		name: node.type,
+		version: node.typeVersion,
+	});
+
+	if (!client.ok) {
+		throw new NodeOperationError(this.getNode(), 'Could not connect to your MCP server');
+	}
+
+	const tools = await getAllTools(client.result);
+	return tools.map((tool) => ({
+		name: tool.name,
+		value: tool.name,
+		description: tool.description,
+	}));
+}