Ares MCP Server

Czech & Slovak business registry - look up companies by IČO, search by name, check legal form, address, and VAT status. Direct from ARES (Czech Ministry of Finance), the official source. Fast, free, no reseller markup. Its 10 documented tools cluster into read & search, validate, check, watch.

People connecting this server to Claude, Cursor, VS Code, or another MCP client. The project is written in TypeScript.

One of 9 MCP servers published from martinhavel/cz-agents-mcp. Stars and repository activity are shared across all of them. See all 9 →

VERIFIED ACTIVE

LAST COMMIT 2026-08-08 · VERIFIED 2026-08-25

MIT · TypeScript servers · how we verify → /methodology

01 · Install Ares

Claude Code

claude mcp add martinhavel-cz-agents-mcp-packages-ares --transport http https://ares.cz-agents.dev/mcp

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "martinhavel-cz-agents-mcp-packages-ares": {
      "url": "https://ares.cz-agents.dev/mcp"
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

https://ares.cz-agents.dev/mcp

transport: streamable-http

endpoint alive - responded to MCP initialize · probed 2026-08-25

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions · remote - your agent's requests go to ares.cz-agents.dev

endpoint auth accepted our unauthenticated MCP initialize - no credentials needed to connect

license MIT - declared in the repository

npm package @czagents/ares - the @czagents scope differs from the repo owner (martinhavel); confirm it's the project's official package

registry vendor namespace dev.cz-agents - domain-verified with the official MCP registry

03 · What Ares can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

What you can build

An agent gets 10 documented tools across read & search, validate, check, including lookup_by_ico, search_companies, search_by_address, search_by_nace.

Capability map

Tools grouped from the project's README - what Ares lets an agent do.

read & search

7 tools - e.g. Use it to retrieve one company’s official ARES record from its 7- or 8-digit IČO, including its identity, address, legal form, DIČ, and trade activities. Do not; Use it to find companies by a name and/or…

lookup_by_ico · search_companies · search_by_address · search_by_nace · get_bank_accounts · get_statutaries…

Validate

1 tool - e.g. Use it for a Czech DIČ format and checksum validation. Do not use it as proof that a subject is VAT registered or a reliable payer; it validates the identifier

validate_dic

Check

1 tool - e.g. Use it to check whether a company is registered as a VAT payer in ARES and retrieve its DIČ, tax office, and transparent accounts. Do not use it to assess the s

check_vat_payer

Watch

1 tool - e.g. Use it to begin onboarding for free monitoring of one company by IČO. It currently persists nothing and returns onboarding guidance; do not use it as evidence t

watch_entity

Latest releases

v0.3.3 · 2026-06-03

Docs-only. Broadens the README so catalog auto-summaries (Glama) represent the full suite (ARES/ČNB/ADIS/ISIR/sanctions/EU registries + dd aggregator), not just 'dd + QR'. No tool/API changes.

v0.3.2 · 2026-06-03

Supersedes v0.3.1 for Glama publishing - use THIS one. · All 9 free packages now have glama.json (added missing realestate/glama.json). · Includes everything from v0.3.1: payqr in README + remote config, unified…

v0.3.1 · 2026-06-03

Docs/metadata release (no new tools or breaking changes). · Unified canonical server descriptions across package.json, README and server.json (consistent across npm, MCP Registry and Glama). · Added @czagents/payqr to…

04 · Who maintains Ares

ares is maintained by martinhavel. We track 9 MCP servers from martinhavel - 9 actively maintained, 5 combined GitHub stars, oldest repo from Apr 2026. Full record: all servers from martinhavel.

05 · Facts

repository: github.com/martinhavel/cz-agents-mcp
website: https://cz-agents.dev/
category: other - actively maintained as of 2026-08-25.
registry: dev.cz-agents/ares (active, first published 2026-04-16 · 4 versions)
packages: npm:@czagents/ares

06 · Ares FAQ

Is Ares still maintained?

Yes - as of 2026-08-25, its last commit was 2026-08-08. We re-verify nightly.

What can Ares do?

An agent gets 10 documented tools across read & search, validate, check, including lookup_by_ico, search_companies, search_by_address, search_by_nace.

How do I install Ares?

Run `npx -y @czagents/ares`. You can also paste the ready-made client config above.

Does Ares require authentication?

No - the endpoint accepted our unauthenticated MCP initialize when probed on 2026-08-25; you can connect without credentials.

07 · Alternatives to Ares

Alternatives to Ares

Maintained other servers if Ares isn't the fit.

More MCP servers to compare · Dd · Eu Registry · Isir · Realestate · Sanctions

More TypeScript MCP servers · Cnb · Payqr · see all