# search_by_address

Find all companies registered at a given Czech address. Useful for due diligence (virtual offices, shell companies), real estate research, or competitor mapping in a building.

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

## Facts

- Tool: `search_by_address`
- 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: 4 (2 required)
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `psc` | integer | no | Postal code (PSČ), optional. |
| `city` | string | yes | City name, e.g. "Praha". |
| `pocet` | integer | no | Max results (default 20). |
| `street` | string | yes | Street name (nazev ulice), e.g. "Radlická". |

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": "search_by_address",
    "arguments": {
      "city": "<city>",
      "street": "<street>"
    }
  }
}
```

## Why search_by_address is rated Low

This is a straightforward query tool that retrieves publicly available company registration information from the Czech Business Register (ARES) based on an address filter. It has no side effects, does not execute code or commands, does not modify data, and does not involve financial transactions. The tool is designed for passive information lookup only.

From the tool's own definition: "Tool performs a search/lookup operation ('Find all companies') against public business registry data by address parameter. No modification, deletion, or execution of external operations is involved."

## Use case

AI agents call search_by_address 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": {
    "search_by_address": {}
  }
}
```

## 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
- `lookup_by_ico` — Read — https://policylayer.com/tools/dev-cz-agents-ares/lookup-by-ico.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