AU Business Identity MCP server

AU Business Identity

Deterministic Australian business identifier validation for AI agents and applications.

Part of AU Agent Utilities.

What it does

AU Business Identity currently validates Australian:

• ABNs — Australian Business Numbers
• ACNs — Australian Company Numbers

Validation is performed locally using the official checksum rules.

It does not yet confirm whether an ABN or ACN is registered, active or associated with a particular entity.

Registry verification and Australian business lookup tools are planned next.

MCP tools

validate_abn

Validates the format and checksum of an Australian Business Number.

Example:

51 824 753 556

Returns structured information including:

• Normalised ABN
• Formatted ABN
• Format validity
• Checksum validity
• Overall validation result

validate_acn

Validates the format and checksum of an Australian Company Number

Example:

004 085 616

Returns structured information including:

• Normalised ACN
• Formatted ACN
• Format validity
• Checksum validity
• Overall validation result

Example agent requests

Is 51 824 753 556 a valid ABN?

Validate ACN 004 085 616

Check whether this Australian business identifier passes its checksum

HTTP endpoints

ABN:

/validate-abn?abn=51824753556

ACN:

/validate-acn?acn=004085616

MCP Endpoint

Public remote MCP endpoint:

https://au-business-identity.auagentutilities.workers.dev/mcp

No API key is required for the current validation tools.

Quick MCP examples

Validate an ABN:

{
  "name": "validate_abn",
  "arguments": {
    "abn": "51 824 753 556"
  }
}

Validate an ACN:

{
  "name": "validate_acn",
  "arguments": {
    "acn": "004 085 616"
  }
}

Planned tools

Future versions are intended to add:

• Australian business lookup
• ABN registry status
• GST registration status
• business-name search
• ABN / business-name matching
• Australian entity verification

Privacy

Anonymous MCP usage logging records protocol events and tool names only.

Tool arguments such as ABNs or ACNs are not intentionally logged by the application.

Development

Install dependencies:

</> Bash 
npm install

Run tests:

</> Bash 
npm vitest run

Run locally:

</> Bash
npm run dev

Licence

MIT