# abr.business.abn_lookup

Resolve an Australian Business Number (ABN) to full entity details using the official Australian Business Register (ABR). Returns entity name, entity type (company, sole trader, partnership, government entity, etc.), ABN status (Active/Cancelled), GST registration date, registered address state and postcode, ACN (if a company), and all registered trading/business names. Covers 15M+ ABNs across all Australian states and territories. Data is live from the ATO-managed national register. Source: ABR, free registration, commercial use permitted.

Agent View of the PolicyLayer registry record for `abr.business.abn_lookup`. HTML page: https://policylayer.com/tools/io-github-whiteknightonhorse-apibase/abr.business.abn-lookup

## Facts

- Tool: `abr.business.abn_lookup`
- Server: Apibase (`apibase-mcp-client`) — https://policylayer.com/tools/io-github-whiteknightonhorse-apibase.md
- Install: `npx -y apibase-mcp-client`
- Homepage: https://github.com/whiteknightonhorse/APIbase
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server auth posture: open
- Server rate-limited: no
- Parameters: 1 (1 required)
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `abn` | string | yes | Australian Business Number (ABN) — 11-digit numeric identifier, spaces optional (e.g. "33 051 775 556" or "33051775556") |

Parameters from the server's own tool schema.

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "abr.business.abn_lookup",
    "arguments": {
      "abn": "<abn>"
    }
  }
}
```

## Why abr.business.abn_lookup is rated Low

Tool queries public business register data with no side effects or modifications.

From the tool's own definition: "Resolve ABN to entity details, returns name, type, status, address."

## Use case

AI agents call abr.business.abn_lookup to retrieve information from Apibase without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

## Recommended policy (PolicyLayer)

Verdict: **Allowed**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Apibase:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "abr.business.abn_lookup": {}
  }
}
```

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## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=io-github-whiteknightonhorse-apibase · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/io-github-whiteknightonhorse-apibase