Croatian Law MCP Server

Croatian Law MCP Server

The NN (Narodne novine) alternative for the AI age.

Query 4,531 Croatian statutes -- from the Zakon o provedbi GDPR and Kazneni zakon to the Zakon o radu, Zakon o trgovačkim društvima, and more -- directly from Claude, Cursor, or any MCP-compatible client.

If you're building legal tech, compliance tools, or doing Croatian legal research, this is your verified reference database.

Built by Ansvar Systems -- Stockholm, Sweden

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Why This Exists

Croatian legal research means navigating Narodne novine, zakon.hr, and EUR-Lex for EU implementation status -- across a dense system of codes and implementing regulations. Whether you're:

• A lawyer validating citations before the Vrhovni sud (Supreme Court) or Ustavni sud (Constitutional Court)
• A compliance officer checking GDPR implementation status under the Zakon o provedbi Opće uredbe o zaštiti podataka
• A legal tech developer building tools on Croatian law
• A researcher tracing EU directive transposition across 4,531 statutes

...you shouldn't need dozens of browser tabs and manual cross-referencing. Ask Claude. Get the exact provision. With context.

This MCP server makes Croatian law searchable, cross-referenceable, and AI-readable.

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Quick Start

Use Remotely (No Install Needed)

Connect directly to the hosted version -- zero dependencies, nothing to install.

Endpoint: https://mcp.ansvar.eu/law-hr/mcp

Claude Desktop -- add to claude_desktop_config.json:

{
  "mcpServers": {
    "croatian-law": {
      "type": "url",
      "url": "https://mcp.ansvar.eu/law-hr/mcp"
    }
  }
}

GitHub Copilot -- add to VS Code settings.json:

{
  "github.copilot.chat.mcp.servers": {
    "croatian-law": {
      "type": "http",
      "url": "https://mcp.ansvar.eu/law-hr/mcp"
    }
  }
}

Use Locally (npm)

npx @ansvar/croatian-law-mcp

Claude Desktop -- add to claude_desktop_config.json:

macOS: ~/Library/Application Support/Claude/claude_desktop_config.json Windows: %APPDATA%\Claude\claude_desktop_config.json

{
  "mcpServers": {
    "croatian-law": {
      "command": "npx",
      "args": ["-y", "@ansvar/croatian-law-mcp"]
    }
  }
}

Cursor / VS Code:

{
  "mcp.servers": {
    "croatian-law": {
      "command": "npx",
      "args": ["-y", "@ansvar/croatian-law-mcp"]
    }
  }
}

Example Queries

Once connected, just ask naturally:

• "Što govori Zakon o provedbi Opće uredbe o zaštiti podataka o privoli?"
• "Je li Kazneni zakon još uvijek na snazi?"
• "Pretraži 'zaštita osobnih podataka' u hrvatskom zakonodavstvu"
• "Koje EU direktive provodi Zakon o radu?"
• "Što kaže članak 144. Kaznenog zakona o povredi tajnosti?"
• "Pronađi odredbe o prijavljivanju povreda osobnih podataka"
• "Koji hrvatski zakoni provode NIS2 direktivu?"
• "Validiraj citat 'članak 5. Zakona o zaštiti osobnih podataka'"
• "Usporedi zahtjeve za zaštitu podataka kroz NIS2 implementacije u hrvatskom pravu"

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What's Included

Verified data only -- every citation is validated against official sources (Narodne novine, zakon.hr). Zero LLM-generated content.

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See It In Action

Why This Works

Verbatim Source Text (No LLM Processing):

• All statute text is ingested from Narodne novine (nn.hr) and zakon.hr official sources
• Provisions are returned unchanged from SQLite FTS5 database rows
• Zero LLM summarization or paraphrasing -- the database contains statute text, not AI interpretations

Smart Context Management:

• Search returns ranked provisions with BM25 scoring (safe for context)
• Provision retrieval gives exact text by statute identifier + article number
• Cross-references help navigate without loading everything at once

Technical Architecture:

Narodne novine / zakon.hr --> Parse --> SQLite --> FTS5 snippet() --> MCP response
                               ^                        ^
                        Provision parser         Verbatim database query

Traditional Research vs. This MCP

Traditional: Pretraži zakon.hr --> Navigi višečlane zakone --> Ctrl+F --> Usporedi s EU direktivama --> Ponovi

This MCP: "Koji EU akt je osnova za članak 5. Zakona o provedbi GDPR?" --> Done.

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Available Tools (13)

Core Legal Research Tools (8)

EU Law Integration Tools (5)

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EU Law Integration

Croatia joined the EU on 1 July 2013. All EU regulations apply directly; directives require transposition into Croatian law.

Key EU-Derived Croatian Legislation

1. Zakon o provedbi Opće uredbe o zaštiti podataka (NN 42/2018) -- GDPR implementation
2. Zakon o kibernetičkoj sigurnosti (NN 14/2024) -- NIS2 transposition
3. Zakon o elektroničkim komunikacijama -- Electronic Communications Code transposition
4. Zakon o tržištu kapitala -- MiFID II transposition
5. Zakon o sprječavanju pranja novca -- AML directive transposition

See EU_INTEGRATION_GUIDE.md for detailed documentation and EU_USAGE_EXAMPLES.md for practical examples.

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Data Sources & Freshness

All content is sourced from authoritative Croatian legal databases:

• Narodne novine -- Official Gazette of the Republic of Croatia
• Zakon.hr -- Consolidated Croatian legislation portal
• EUR-Lex -- Official EU law database (cross-reference metadata)

Data Provenance

Automated Freshness Checks

A GitHub Actions workflow monitors Narodne novine for changes:

Verified data only -- every citation is validated against official sources. Zero LLM-generated content.

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Security

This project uses multiple layers of automated security scanning:

See SECURITY.md for the full policy and vulnerability reporting.

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Important Disclaimers

Legal Advice

THIS TOOL IS NOT LEGAL ADVICE

Statute text is sourced from official Narodne novine and zakon.hr publications. However:

• This is a research tool, not a substitute for professional legal counsel
• Court case coverage is not included -- do not rely solely on this for case law research; consult official Vrhovni sud and Ustavni sud databases
• Verify critical citations against primary sources for court filings
• EU cross-references are derived from statute text and metadata, not EUR-Lex full text analysis
• Consolidated versions on zakon.hr may differ from the Narodne novine original -- always verify against the official gazette for legal proceedings

Before using professionally, read: DISCLAIMER.md | PRIVACY.md

Client Confidentiality

Queries go through the Claude API. For privileged or confidential matters, use on-premise deployment. Consult Hrvatska odvjetnička komora (HOK) guidelines on the use of AI tools in legal practice.

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Development

Setup

git clone https://github.com/Ansvar-Systems/croatian-law-mcp
cd croatian-law-mcp
npm install
npm run build
npm test

Running Locally

npm run dev                                       # Start MCP server
npx @anthropic/mcp-inspector node dist/index.js   # Test with MCP Inspector

Data Management

npm run ingest                    # Ingest statutes from Narodne novine
npm run catalog:crawl             # Crawl NN law catalog
npm run catalog:build-csv         # Build catalog from CSV
npm run catalog:ingest            # Ingest from catalog
npm run catalog:sync-fast         # Fast sync via CSV + ingest
npm run build:db                  # Rebuild SQLite database
npm run drift:detect              # Run drift detection against anchors

Performance

• Search Speed: <100ms for most FTS5 queries
• Database Size: 253 MB (optimized, portable)
• Reliability: 100% ingestion success rate across 4,531 statutes

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Related Projects: Complete Compliance Suite

This server is part of Ansvar's Compliance Suite -- MCP servers that work together for end-to-end compliance coverage:

@ansvar/eu-regulations-mcp

Query 49 EU regulations directly from Claude -- GDPR, AI Act, DORA, NIS2, MiFID II, eIDAS, and more. npx @ansvar/eu-regulations-mcp

@ansvar/slovenian-law-mcp

Query Slovenian legislation -- neighbour state, similar legal system. npx @ansvar/slovenian-law-mcp

@ansvar/security-controls-mcp

Query 261 security frameworks -- ISO 27001, NIST CSF, SOC 2, CIS Controls, SCF, and more. npx @ansvar/security-controls-mcp

70+ national law MCPs covering Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, and more.

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Contributing

Contributions welcome! See CONTRIBUTING.md for guidelines.

Priority areas:

• Court case law expansion (Vrhovni sud, Ustavni sud, VSRH)
• EU cross-reference expansion (full directive-to-statute mapping)
• Historical statute versions and amendment tracking
• Lower court decisions (Županijski sud, Općinski sud archives)

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Roadmap

• Core statute database with FTS5 search
• Full corpus ingestion (4,531 statutes, 157,667 provisions)
• EU law integration tools
• Vercel Streamable HTTP deployment
• npm package publication
• Court case law expansion (Vrhovni sud, Ustavni sud)
• Full EU text integration (via @ansvar/eu-regulations-mcp)
• Lower court coverage (Županijski, Općinski archives)
• Historical statute versions (amendment tracking)
• Web API for programmatic access

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Citation

If you use this MCP server in academic research:

@software{croatian_law_mcp_2026,
  author = {Ansvar Systems AB},
  title = {Croatian Law MCP Server: AI-Powered Legal Research Tool},
  year = {2026},
  url = {https://github.com/Ansvar-Systems/croatian-law-mcp},
  note = {4,531 Croatian statutes with 157,667 provisions and EU law cross-references}
}

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License

Apache License 2.0. See LICENSE for details.

Data Licenses

• Statutes & Legislation: Narodne novine d.d. (public domain government works)
• EU Metadata: EUR-Lex (EU public domain)

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About Ansvar Systems

We build AI-accelerated compliance and legal research tools for the European market. This MCP server started as our internal reference tool for Croatian law -- turns out everyone building for the Adriatic and EU markets has the same research frustrations.

So we're open-sourcing it. Navigating 4,531 statutes and their EU source directives shouldn't require a law degree.

ansvar.eu -- Stockholm, Sweden

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