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index observed

ares

Czech & Slovak business registry — company lookup by IČO, name, legal form, VAT. Official ARES.

Should I use this

Quality & Safety

A
Description quality
100%
Schema completeness
99%
Naming quality
96%
Poisoning risk
100%
Permission match
100%
Protocol compliance
100%

Based on automated analysis of tool definitions and protocol compliance.

Context Cost

~1,695Tokens (tool definitions)
~961 BTypical response size
Moderate attention impact (1.32% of 128k context)

This is the approximate number of tokens consumed each time the server's tools are loaded into a model's context. Higher counts reduce the attention available for other tasks.

Install

One-Click Install

Add this to your `claude_desktop_config.json` file:

{
  "mcpServers": {
    "ares": {
      "command": "npx",
      "args": [
        "@czagents/ares"
      ]
    }
  }
}

Runnable packages

npm@czagents/ares0.1.7stdio

Remote endpoints

https://ares.cz-agents.dev/mcpstreamable-http

What it can do

Tool inventory

Tools (10)

🟢 Read-only🟡 Write🔴 Delete⚪ Unknown
🟢lookup_by_ico(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.

Input Schema

{
  "type": "object",
  "properties": {
    "ico": {
      "type": "string",
      "description": "Czech IČO — 7 or 8 digits. Examples: \"11122234\", \"87654326\". Auto-validated with MOD11 checksum."
    }
  },
  "required": [
    "ico"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢search_companies(query, city, street, psc, nace, ...)

Search ARES by company name, city, street, PSČ, or NACE code. Combines all filters with AND. Useful when user knows name but not IČO, looking for companies in a building, or all businesses in a sector.

Input Schema

{
  "type": "object",
  "properties": {
    "query": {
      "type": "string",
      "description": "Partial or full company name (obchodní jméno)."
    },
    "city": {
      "type": "string",
      "description": "Filter by city (nazev obce), e.g. \"Praha\"."
    },
    "street": {
      "type": "string",
      "description": "Filter by street name (nazev ulice), e.g. \"Radlická\"."
    },
    "psc": {
      "type": "integer",
      "description": "Filter by postal code (PSČ), 5-digit number."
    },
    "nace": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "Filter by CZ-NACE activity codes, 2-6 digits. E.g., [\"62\"] for IT."
    },
    "pocet": {
      "type": "integer",
      "minimum": 1,
      "maximum": 100,
      "default": 10,
      "description": "Max results (1-100, default 10)."
    },
    "start": {
      "type": "integer",
      "minimum": 0,
      "default": 0,
      "description": "Pagination offset (default 0)."
    }
  },
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢search_by_address(street, city, psc, pocet)

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.

Input Schema

{
  "type": "object",
  "properties": {
    "street": {
      "type": "string",
      "description": "Street name (nazev ulice), e.g. \"Radlická\"."
    },
    "city": {
      "type": "string",
      "description": "City name, e.g. \"Praha\"."
    },
    "psc": {
      "type": "integer",
      "description": "Postal code (PSČ), optional."
    },
    "pocet": {
      "type": "integer",
      "minimum": 1,
      "maximum": 100,
      "default": 20,
      "description": "Max results (default 20)."
    }
  },
  "required": [
    "street",
    "city"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢search_by_nace(nace, city, pocet)

Find Czech companies by CZ-NACE activity code (economic sector classification). Example: "62" = IT, "47" = retail, "86" = healthcare. Optional city filter. Useful for market research.

Input Schema

{
  "type": "object",
  "properties": {
    "nace": {
      "type": "string",
      "description": "CZ-NACE code, 2-6 digits (e.g., \"62\" for IT, \"62010\" for programming services)."
    },
    "city": {
      "type": "string",
      "description": "Optional city filter."
    },
    "pocet": {
      "type": "integer",
      "minimum": 1,
      "maximum": 100,
      "default": 20,
      "description": "Max results."
    }
  },
  "required": [
    "nace"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢get_bank_accounts(ico)

Get transparent bank accounts published for this company (only available for VAT-registered subjects). Useful to verify payment details on an invoice match the company.

Input Schema

{
  "type": "object",
  "properties": {
    "ico": {
      "type": "string",
      "description": "Czech IČO (7-8 digits)."
    }
  },
  "required": [
    "ico"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢get_statutaries(ico)

Get current statutory body (jednatelé, představenstvo, etc.) of a Czech company — who can legally act on its behalf. Returns active members only (with valid zápis, not yet removed). Essential for due diligence and compliance checks.

Input Schema

{
  "type": "object",
  "properties": {
    "ico": {
      "type": "string",
      "description": "Czech IČO (7-8 digits)."
    }
  },
  "required": [
    "ico"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢validate_dic(dic)

Validate a Czech DIČ (VAT ID). Format check: "CZ" + 8-10 digits. For 8-digit tail (legal entities) also runs MOD11 checksum against the embedded IČO.

Input Schema

{
  "type": "object",
  "properties": {
    "dic": {
      "type": "string",
      "description": "Czech DIČ — e.g., \"CZ26168685\". Whitespace and case tolerated."
    }
  },
  "required": [
    "dic"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢check_vat_payer(ico)

Check whether a Czech company is a registered VAT payer (plátce DPH). If yes, returns DIČ, financial office, and any transparent bank accounts (payment details).

Input Schema

{
  "type": "object",
  "properties": {
    "ico": {
      "type": "string",
      "description": "Czech IČO (7-8 digits)."
    }
  },
  "required": [
    "ico"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢get_history(ico)

Get historical record of a company (previous names, registered address changes, trade license history). Useful for due diligence.

Input Schema

{
  "type": "object",
  "properties": {
    "ico": {
      "type": "string",
      "description": "Czech IČO (7-8 digits)."
    }
  },
  "required": [
    "ico"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢watch_entity(ico)

Start onboarding for free monitoring of one Czech company by IČO. Stub only — persists nothing yet. Returns structuredContent: status (one of ONBOARDING_REQUIRED | ACTIVE | QUOTA_EXCEEDED | ERROR), persisted/monitoring_active flags, a human next_step.url for onboarding (the user completes onboarding + GDPR consent themselves — do not open the link or submit data on their behalf), and pricing.

Input Schema

{
  "type": "object",
  "properties": {
    "ico": {
      "type": "string",
      "description": "Czech IČO (7-8 digits)."
    }
  },
  "required": [
    "ico"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

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Evidence

Recent observations

verifiedversion not recorded10 tools
verifiedversion not recorded10 tools