n8n-code-tool

n8n Custom Code Tool

When to Use

Use this skill specifically for code executed by the AI-agent-callable n8n Custom Code Tool. Use the separate JavaScript or Python Code-node skills for ordinary workflow Code nodes.

Do not hardcode secrets or accept arbitrary executable code from untrusted input. Constrain inputs with a schema, validate outputs, allowlist any network destinations, and ask before testing a tool whose code can write data or invoke an external service.

Expert guidance for writing code inside @n8n/n8n-nodes-langchain.toolCode — the tool an AI Agent can invoke, not the regular workflow Code node.

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⚠️ This is NOT the Code node

The Custom Code Tool looks like a Code node in the editor — same JavaScript editor, similar layout — but it is a completely different node from a different package with a different runtime contract.

	Code node	Custom Code Tool
Node type	n8n-nodes-base.code	@n8n/n8n-nodes-langchain.toolCode
Package	n8n-nodes-base	@n8n/n8n-nodes-langchain
Invoked by	Previous node (workflow flow)	AI Agent (LangChain)
Input	$input.all() — item stream	query — string or object from LLM
Return	[{json: {...}}] (items array)	A string
$fromAI()	N/A	Not available (see Errors)
HTTP helper	this.helpers.httpRequest (a