n8n-io/n8n · error · NodeOperationError

No MCP OAuth2 credential type found

Error message

No MCP OAuth2 credential type found

What it means

Error "No MCP OAuth2 credential type found" thrown in n8n-io/n8n.

Source

Thrown at packages/@n8n/nodes-langchain/nodes/mcp/McpRegistryClientTool/McpRegistryClientTool.node.ts:206

			mode: ctx.getNodeParameter('include', itemIndex) as McpToolIncludeMode,
			includeTools: ctx.getNodeParameter('includeTools', itemIndex, []) as string[],
			excludeTools: ctx.getNodeParameter('excludeTools', itemIndex, []) as string[],
		},
	};
}

function getCredentialType(
	ctx: Pick<ILoadOptionsFunctions | ISupplyDataFunctions | IExecuteFunctions, 'getNode'>,
): McpAuthenticationOption {
	const node = ctx.getNode();
	const credentials = node.credentials ?? {};
	const credentialType = Object.keys(credentials).find(
		// for now we support only OAuth2
		(credentialType) => isMcpOAuth2Authentication(credentialType),
	);

	if (!credentialType) {
		throw new NodeOperationError(node, 'No MCP OAuth2 credential type found');
	}

	return credentialType;
}

View on GitHub (pinned to 5ac6606e81)

When it happens

Trigger: Thrown at packages/@n8n/nodes-langchain/nodes/mcp/McpRegistryClientTool/McpRegistryClientTool.node.ts:206 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of n8n-io/n8n@5ac6606e81 (2026-08-12). Data as JSON: /api/errors/8399506fc8b2cb07. Report an issue: GitHub.