# abr.business.acn_lookup

Resolve an Australian Company Number (ACN) or ASIC-registered number to full entity details via the Australian Business Register (ABR). Returns the linked ABN, entity name, company type, ABN status, GST registration, registered address, and all associated business names. ACN is a 9-digit number issued by ASIC to every registered Australian company. Use this when you have an ACN from an invoice, contract, or company extract and need to verify the entity against the national register. Source: ABR, free registration, commercial use permitted.

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

## Facts

- Tool: `abr.business.acn_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 |
| --- | --- | --- | --- |
| `acn` | string | yes | Australian Company Number (ACN) — 9-digit numeric identifier issued by ASIC, spaces optional (e.g. "051 775 556" or "051775556") |

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.acn_lookup",
    "arguments": {
      "acn": "<acn>"
    }
  }
}
```

## Why abr.business.acn_lookup is rated Low

Tool queries public business registry data without modification or side effects.

From the tool's own definition: "Resolve, lookup, returns entity details, verify against register"

Risk signals: Bulk/mass operation — affects multiple targets

## Use case

AI agents call abr.business.acn_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.acn_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