Czech Company Registry (ARES) Tools
REMOTE · CZID.CASUYI.COM · SCANNED SEP 28
Czech ARES company registry: VAT, insolvency, RÚIAN addresses, IČO/DIČ checks. All free, no auth.
Available components
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. How we score → Why this is hard to score →
Endpoint Security46
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- 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. See how to fix → View diagnostics → Unverified
- HTTPS enforcement could not be verified: the plaintext port answered with HTTP 405, which proves neither a plaintext path nor enforcement. View diagnostics → Unverified
- HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability78
- AI-judged instruction clarity (excellent).Pass
- Tool/resource definitions use about 430 tokens (~71/item across 6 items; 6 tools + 0 resources), lean.Pass
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management43
- Stability observed for 13 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage87
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 60% of tool parameters carry a description.Partial
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 6 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 6 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a current MCP spec version (2026-07-28).Pass
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.
remote · czid.casuyi.com
claude mcp add --transport http appvantagelabs2-a11y-czid 'https://czid.casuyi.com/mcp'
{
"mcpServers": {
"appvantagelabs2-a11y-czid": {
"url": "https://czid.casuyi.com/mcp"
}
}
} {
"servers": {
"appvantagelabs2-a11y-czid": {
"type": "http",
"url": "https://czid.casuyi.com/mcp"
}
}
} [mcp_servers.appvantagelabs2-a11y-czid] url = "https://czid.casuyi.com/mcp"
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"appvantagelabs2-a11y-czid": {
"type": "remote",
"url": "https://czid.casuyi.com/mcp",
"enabled": true
}
}
} openclaw mcp add appvantagelabs2-a11y-czid --url 'https://czid.casuyi.com/mcp' --transport streamable-http
mcp_servers:
appvantagelabs2-a11y-czid:
url: "https://czid.casuyi.com/mcp" {
"McpServers": {
"appvantagelabs2-a11y-czid": {
"Transport": "http",
"Url": "https://czid.casuyi.com/mcp"
}
}
} assistant mcp add appvantagelabs2-a11y-czid -t streamable-http -u 'https://czid.casuyi.com/mcp'
{
"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.
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 28 Sept 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 26 Sept 26 +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.
- 25 Sept 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 24 Sept 26 +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.
- 22 Sept 26 +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.
- 20 Sept 26 +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.
- 18 Sept 26 +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.
- 16 Sept 26 +1
- 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 functional
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 28 Sept 2026 · Probed https://czid.casuyi.com/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=casuyi.com | CN=WE1,O=Google Trust Services,C=US | 15 Aug 2026 | 13 Nov 2026 | ECDSA 256 | ECDSA-SHA256 | db0f1cd9710e1661325b09e62ee9605 |
| SANs: casuyi.com, *.casuyi.com | ||||||
| CN=WE1,O=Google Trust Services,C=US (CA) | CN=GTS Root R4,O=Google Trust Services LLC,C=US | 13 Dec 2023 | 20 Feb 2029 | ECDSA 256 | ECDSA-SHA384 | 7ff31977972c224a76155d13b6d685e3 |
| CN=GTS Root R4,O=Google Trust Services LLC,C=US (CA) | CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE | 15 Nov 2023 | 28 Jan 2028 | ECDSA 384 | SHA256-RSA | 7fe530bf331343bedd821610493d8a1b |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of czid.casuyi.com. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| com. | present | 19718 | 13 | Verified |
| casuyi.com. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://czid.casuyi.com/mcp | Verified | 200 | |
| http (plaintext) | http://czid.casuyi.com/mcp | Inconclusive | 405 |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
address_check Standardize Czech address (RÚIAN) ~59
Free-text Czech address -> RÚIAN-standardized (full KOD ADM, codes for obec/část/ulice, correct PSC).
| Name | Type | Req | Description |
|---|---|---|---|
| address | string | yes | e.g. "Václavské náměstí 1, Praha" |
No output schema declared.
No examples provided.
check_vat Czech VAT (DPH) status check ~71
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.
| Name | Type | Req | Description |
|---|---|---|---|
| ids | array | yes | IČOs or DIČs (CZ+10) |
No output schema declared.
No examples provided.
company_lookup Lookup Czech company by IČO or DIČ ~80
Basic register (ARES) lookup: name, legal form, registered address, NACE, data-box, VAT DIČ. Input: IČO (8 digits) or DIČ (CZ+10).
| Name | Type | Req | Description |
|---|---|---|---|
| id | string | yes | IČO (e.g. 27082440) or DIČ (e.g. CZ27082440) |
No output schema declared.
No examples provided.
entity_status Entity risk snapshot (registers + insolvency) ~66
KYC-style snapshot: active/cancelled, which registers the entity appears in (VR, RZP, NRPZS, RS insolvency, RCNS, SZR...), plus insolvency-register record if present.
| Name | Type | Req | Description |
|---|---|---|---|
| id | string | yes | IČO or DIČ |
No output schema declared.
No examples provided.
search_company Search Czech companies by name ~71
Company-name search in ARES (prefix match, case-insensitive; no wildcards). Returns IČOs + names + addresses for further lookups.
| Name | Type | Req | Description |
|---|---|---|---|
| limit | integer | – | Max results (default 10) |
| name | string | yes | Company name or name prefix (e.g. "Alza") |
No output schema declared.
No examples provided.
validate_cz Validate Czech identifiers (offline) ~83
Checksum/format validation: IČO (mod-11), DIČ (CZ+IČO or birth number), IBAN (mod-97, CZ-specific), variable symbol. Pure local, no network.
| Name | Type | Req | Description |
|---|---|---|---|
| dic | string | – | – |
| iban | string | – | – |
| ico | string | – | – |
| variableSymbol | string | – | – |
No output schema declared.
No examples provided.
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.