n8n-io/n8n · error · NodeOperationError

No tool inputs found

Error message

No tool inputs found

What it means

Thrown by the ToolExecutor node when getInputConnectionData for AiTool returns a falsy value or a non-array. The node iterates over connected tools to find the one named toolName; if there is nothing iterable to loop over, it cannot proceed.

Source

Thrown at packages/@n8n/nodes-langchain/nodes/ToolExecutor/ToolExecutor.node.ts:111

			throw new NodeOperationError(
				this.getNode(),
				`Failed to parse query: ${(error as Error).message}`,
			);
		}

		const getQueryData = (name: string) => {
			// node names in query may have underscores in place of spaces, use it for accessing the query data.
			return (get(parsedQuery, name, null) ?? get(parsedQuery, name.replaceAll(' ', '_'), null)) as
				| Record<string, unknown>
				| string
				| null;
		};

		const resultData: INodeExecutionData[] = [];
		const toolInputs = await this.getInputConnectionData(NodeConnectionTypes.AiTool, 0);

		if (!toolInputs || !Array.isArray(toolInputs)) {
			throw new NodeOperationError(this.getNode(), 'No tool inputs found');
		}

		try {
			for (const tool of toolInputs) {
				// Handle toolkits
				if (tool && typeof (tool as Toolkit).getTools === 'function') {
					const toolsInToolkit = (tool as Toolkit).getTools();
					for (const toolkitTool of toolsInToolkit) {
						if (!(toolkitTool instanceof Tool || toolkitTool instanceof StructuredTool)) {
							continue;
						}

						if (toolName === toolkitTool.name) {
							if (hasGatedToolNodeName(toolkitTool.metadata) && node) {
								const toolInput: { toolParameters: unknown } = {
									toolParameters: getQueryData(toolName) ?? {},
								};
								const hitlInput = getQueryData(node);

View on GitHub (pinned to 5ac6606e81)

Solutions

1. Connect at least one Tool or Toolkit node to the ToolExecutor's AiTool input.
2. Verify connected tool nodes execute and return a valid tool instance.
3. Ensure the connection type is AiTool (not AiLanguageModel or other).

Example fix

// before: ToolExecutor has toolName set but no tool connected
// after: connect the desired Tool/Toolkit node to the AiTool input

const toolInputs = await getInputConnectionData(NodeConnectionTypes.AiTool, 0);
if (!Array.isArray(toolInputs) || toolInputs.length === 0) {
  throw new Error('Connect at least one Tool/Toolkit');
}

function hasToolInputs(t): t is unknown[] { return Array.isArray(t) && t.length > 0; }

When it happens

Trigger: After `const toolInputs = await this.getInputConnectionData(NodeConnectionTypes.AiTool, 0)`, the check `if (!toolInputs || !Array.isArray(toolInputs))` throws. Fires when no tool/toolkit is connected to the AiTool input, or the connection resolves to a non-array.

Common situations: ToolExecutor node with no tool connected; a connected tool node that failed to supply data; wrong connection type attached; the tool sub-graph upstream errored.

Related errors

• No models connected
• Reflector output must be valid JSON
• Chat Model is required
• Failed to parse query: ${(error as Error).message}
• Error executing tool: ${(error as Error).message}

AI-assisted analysis of n8n-io/n8n@5ac6606e81 (2026-08-12). Data as JSON: /api/errors/46fa29332b17ad94. Report an issue: GitHub.