Building a Verified n8n Node Exposed as an AI Agent Tool

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The author published n8n-nodes-vatnode, a verified n8n community node for EU VAT number validation. Setting the usableAsTool flag causes n8n to generate an agent-facing Tool variant, where the node's descriptions are read by a language model rather than a person. Evidence for how this flag behaves comes from n8n's type definitions, its node-creation template guide, and its source code, since the flag is not covered in the docs the author checked. The author notes that the Tool variant's behavior with agents was not tested and that availability may depend on instance configuration. To guide model choice, the node's operations state their cost directly in their descriptions, with the offline Check Format operation distinguished from the quota-spending Validate operation.

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