# Czech Company Registry (ARES) Tools (remote · czid.casuyi.com)

Czech ARES company registry: VAT, insolvency, RÚIAN addresses, IČO/DIČ checks. All free, no auth.

- Trust score: 65/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-28

## Components

- remote · `czid.casuyi.com`: 65/100 (this document), [markdown](https://verifymcp.io/servers/appvantagelabs2-a11y-czid/czid.md), [page](https://verifymcp.io/servers/appvantagelabs2-a11y-czid/czid)

## Channel facts

- Endpoint: `https://czid.casuyi.com/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.1`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-09-28.

- **Endpoint Security**: 46/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 6 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS enforcement could not be verified: the plaintext port answered with HTTP 405, which proves neither a plaintext path nor enforcement.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 78/100
  - AI-judged instruction clarity (excellent).
  - Tool/resource definitions use about 430 tokens (~71/item across 6 items; 6 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 43/100
  - Stability observed for 13 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 87/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 60% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 6 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 6 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a current MCP spec version (2026-07-28).

## Install

### How do I install the Czech Company Registry (ARES) Tools MCP server?

Czech Company Registry (ARES) Tools is a hosted endpoint at https://czid.casuyi.com/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http appvantagelabs2-a11y-czid 'https://czid.casuyi.com/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "appvantagelabs2-a11y-czid": {
      "url": "https://czid.casuyi.com/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "appvantagelabs2-a11y-czid": {
      "type": "http",
      "url": "https://czid.casuyi.com/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.appvantagelabs2-a11y-czid]
url = "https://czid.casuyi.com/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "appvantagelabs2-a11y-czid": {
      "type": "remote",
      "url": "https://czid.casuyi.com/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add appvantagelabs2-a11y-czid --url 'https://czid.casuyi.com/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  appvantagelabs2-a11y-czid:
    url: "https://czid.casuyi.com/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "appvantagelabs2-a11y-czid": {
      "Transport": "http",
      "Url": "https://czid.casuyi.com/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add appvantagelabs2-a11y-czid -t streamable-http -u 'https://czid.casuyi.com/mcp'
```

### Other

```json
{
  "mcpServers": {
    "appvantagelabs2-a11y-czid": {
      "type": "http",
      "url": "https://czid.casuyi.com/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-09-28 (score 65, 0)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-09-26 (score 65, +1)

No change was recorded against any check on this day. Stability & Change Management went from 33 to 37. That category is still filling its 30-day observation window: 10 days of observed history at the previous scan, 11 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-25 (score 64, 0)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-09-24 (score 64, +1)

No change was recorded against any check on this day. Stability & Change Management went from 27 to 30. That category is still filling its 30-day observation window: 8 days of observed history at the previous scan, 9 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-22 (score 63, +1)

No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-20 (score 62, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-18 (score 61, +1)

No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-16 (score 60, +1)

- [functional improvement] Stability: unverified → 0.03
- [functional] MCP protocol: Implements a current MCP spec version (2026-07-28).
- [functional] MCP protocol version: 2025-11-25 → 2026-07-28
- [functional] Server version: 0.2.0 → 0.3.0
- [functional] Server version: 0.1.0 → 0.2.0

## MCP tools (6)

### `company_lookup` (~80 tokens)

Lookup Czech company by IČO or DIČ

Basic register (ARES) lookup: name, legal form, registered address, NACE, data-box, VAT DIČ. Input: IČO (8 digits) or DIČ (CZ+10).

Input parameters:

- `id` (string, required): IČO (e.g. 27082440) or DIČ (e.g. CZ27082440)

### `check_vat` (~71 tokens)

Czech VAT (DPH) status check

Authoritative plátce-DPH status from RZP register: payer yes/no, effective from, tax office, trade licences. Use before issuing/czech invoicing. Batch up to 20 IČOs.

Input parameters:

- `ids` (array, required): IČOs or DIČs (CZ+10)

### `entity_status` (~66 tokens)

Entity risk snapshot (registers + insolvency)

KYC-style snapshot: active/cancelled, which registers the entity appears in (VR, RZP, NRPZS, RS insolvency, RCNS, SZR...), plus insolvency-register record if present.

Input parameters:

- `id` (string, required): IČO or DIČ

### `search_company` (~71 tokens)

Search Czech companies by name

Company-name search in ARES (prefix match, case-insensitive; no wildcards). Returns IČOs + names + addresses for further lookups.

Input parameters:

- `limit` (integer): Max results (default 10)
- `name` (string, required): Company name or name prefix (e.g. "Alza")

### `validate_cz` (~83 tokens)

Validate Czech identifiers (offline)

Checksum/format validation: IČO (mod-11), DIČ (CZ+IČO or birth number), IBAN (mod-97, CZ-specific), variable symbol. Pure local, no network.

Input parameters:

- `dic` (string)
- `iban` (string)
- `ico` (string)
- `variableSymbol` (string)

### `address_check` (~59 tokens)

Standardize Czech address (RÚIAN)

Free-text Czech address -> RÚIAN-standardized (full KOD ADM, codes for obec/část/ulice, correct PSC).

Input parameters:

- `address` (string, required): e.g. "Václavské náměstí 1, Praha"

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/appvantagelabs2-a11y-czid/czid#diagnostics

## Score history

- 2026-09-28: 65
- 2026-09-27: 65
- 2026-09-26: 65
- 2026-09-25: 64
- 2026-09-24: 64
- 2026-09-23: 63
- 2026-09-22: 63
- 2026-09-21: 62
- 2026-09-20: 62
- 2026-09-19: 61
- 2026-09-18: 61
- 2026-09-17: 60
- 2026-09-16: 60
- 2026-09-15: 59

## Common questions

### What is the Czech Company Registry (ARES) Tools MCP server?

Czech Company Registry (ARES) Tools is an MCP server listed in the public MCP registry as io.github.appvantagelabs2-a11y/czid. Czech ARES company registry: VAT, insolvency, RÚIAN addresses, IČO/DIČ checks. All free, no auth. This page covers its hosted endpoint (https://czid.casuyi.com/mcp).

### Is the Czech Company Registry (ARES) Tools MCP server safe to use?

Czech Company Registry (ARES) Tools scores 65 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the Czech Company Registry (ARES) Tools MCP server expose?

Czech Company Registry (ARES) Tools exposes 6 tools: company_lookup, check_vat, entity_status, search_company, validate_cz, address_check. Their descriptions and schemas cost roughly 430 tokens of context every time the server is loaded.

### Does the Czech Company Registry (ARES) Tools MCP server require authentication?

No. We connected to Czech Company Registry (ARES) Tools without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the Czech Company Registry (ARES) Tools MCP server still maintained?

Czech Company Registry (ARES) Tools is still listed as active in the MCP registry. We last reached this channel on 28 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://czid.casuyi.com/mcp
- Website: https://czid.casuyi.com/
- Changelog RSS feed: https://verifymcp.io/servers/appvantagelabs2-a11y-czid/czid.xml
- Changelog JSON feed: https://verifymcp.io/servers/appvantagelabs2-a11y-czid/czid.json
- HTML version of this page: https://verifymcp.io/servers/appvantagelabs2-a11y-czid/czid