OAuth2 authentication requires mcp trigger node v2.0 or high

Error message

OAuth2 authentication requires mcp trigger node v2.0 or higher

What it means

Error "OAuth2 authentication requires mcp trigger node v2.0 or higher" thrown in n8n-io/n8n.

Source

Thrown at packages/@n8n/nodes-langchain/nodes/mcp/McpTrigger/McpTrigger.node.ts:175

				httpMethod: 'DELETE',
				responseMode: 'onReceived',
				isFullPath: true,
				path: '={{$parameter["path"]}}',
				nodeType: 'mcp',
				ndvHideMethod: true,
				ndvHideUrl: true,
			},
		],
	};

	async webhook(context: IWebhookFunctions): Promise<IWebhookResponseData> {
		const webhookName = context.getWebhookName();
		const req = context.getRequestObject();
		const resp = context.getResponseObject() as unknown as CompressionResponse;

		if (context.getNodeParameter('authentication') === 'n8nOAuth2') {
			if (context.getNode().typeVersion < 2) {
				resp.writeHead(401);
				resp.end('OAuth2 authentication requires mcp trigger node v2.0 or higher');
				return { noWebhookResponse: true };
			}
			const authResult = await n8nOAuth2Auth(context, { realm: 'n8n MCP Server' });
			if (authResult === 'handled') {
				return { noWebhookResponse: true };
			}
			await context.establishTriggerIdentity(authResult.token, authResult.resource);
		} else {
			try {
				await validateWebhookAuthentication(context, 'authentication');
			} catch (error) {
				if (error instanceof WebhookAuthorizationError) {
					resp.writeHead(error.responseCode);
					resp.end(error.message);
					return { noWebhookResponse: true };
				}
				throw error;

View on GitHub (pinned to 5ac6606e81)

When it happens

Trigger: Thrown at packages/@n8n/nodes-langchain/nodes/mcp/McpTrigger/McpTrigger.node.ts:175 when the library encounters an invalid state.

Common situations: See trigger scenarios.

Understand the failure class

Authentication and authorization failures — expired tokens, bad credentials, and missing scopes.

AI-assisted analysis of n8n-io/n8n@5ac6606e81 (2026-08-12). Data as JSON: /api/errors/cf43f562218106bf. Report an issue: GitHub.