# lookup_by_ico

Get a single Czech company record by its IČO (8-digit Business ID). Returns official name, registered address, legal form, VAT ID (DIČ), founding date, and trade license activities. Returns null if IČO is not found in ARES.

Agent View of the PolicyLayer registry record for `lookup_by_ico`. HTML page: https://policylayer.com/tools/dev-cz-agents-ares/lookup-by-ico

## Facts

- Tool: `lookup_by_ico`
- Server: Ares (`https://ares.cz-agents.dev/mcp`) — https://policylayer.com/tools/dev-cz-agents-ares.md
- Homepage: https://github.com/martinhavel/cz-agents-mcp
- Risk category: Read (Low risk)
- Registry record: grade C, identity unverified
- Server auth posture: open
- Server rate-limited: yes
- Parameters: 1 (1 required)
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `ico` | string | yes | Czech IČO — 7 or 8 digits. Examples: "11122234", "87654326". Auto-validated with MOD11 checksum. |

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": "lookup_by_ico",
    "arguments": {
      "ico": "<ico>"
    }
  }
}
```

## Why lookup_by_ico is rated Low

This tool performs a straightforward lookup query against a public business register database. It retrieves publicly available company information by a known identifier (IČO) and does not modify, delete, execute code, or trigger external operations.

From the tool's own definition: "Tool description explicitly states 'Get a single Czech company record' and 'Returns official name, registered address, legal form, VAT ID, founding date, and trade license activities.' The verb 'Get' and the return-only nature with 'Returns null if IČO is not…"

## Use case

AI agents call lookup_by_ico to retrieve information from Ares 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 Ares:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "lookup_by_ico": {}
  }
}
```

## Other tools on Ares (9)

- `check_vat_payer` — Read — https://policylayer.com/tools/dev-cz-agents-ares/check-vat-payer.md
- `get_bank_accounts` — Read — https://policylayer.com/tools/dev-cz-agents-ares/get-bank-accounts.md
- `get_history` — Read — https://policylayer.com/tools/dev-cz-agents-ares/get-history.md
- `get_statutaries` — Read — https://policylayer.com/tools/dev-cz-agents-ares/get-statutaries.md
- `search_by_address` — Read — https://policylayer.com/tools/dev-cz-agents-ares/search-by-address.md
- `search_by_nace` — Read — https://policylayer.com/tools/dev-cz-agents-ares/search-by-nace.md
- `search_companies` — Read — https://policylayer.com/tools/dev-cz-agents-ares/search-companies.md
- `validate_dic` — Read — https://policylayer.com/tools/dev-cz-agents-ares/validate-dic.md
- `watch_entity` — Write — https://policylayer.com/tools/dev-cz-agents-ares/watch-entity.md

## 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=dev-cz-agents-ares · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/dev-cz-agents-ares