Polish Law MCP Server

Polish Law MCP Server

The ISAP (Internetowy System Aktów Prawnych) alternative for the AI age.

Query 8,943 Polish statutes -- from Ustawa o ochronie danych osobowych (UODO/RODO) and Kodeks karny to Kodeks cywilny, Kodeks spółek handlowych, Kodeks pracy, and more -- directly from Claude, Cursor, or any MCP-compatible client.

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

Built by Ansvar Systems -- Stockholm, Sweden

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Why This Exists

Polish legal research means navigating ISAP (Sejm), the Dziennik Ustaw, and EUR-Lex, then manually reconciling between national statutes and EU directives. Whether you're:

• A lawyer validating citations in a brief or contract
• A compliance officer checking UODO (RODO) obligations or KSC requirements
• A legal tech developer building tools on Polish law
• A researcher tracing legislative provisions published in Dziennik Ustaw from 1918 to 2026

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

This MCP server makes Polish 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-pl/mcp

Claude Desktop -- add to claude_desktop_config.json:

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

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

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

Use Locally (npm)

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

Cursor / VS Code:

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

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Example Queries

Once connected, just ask naturally:

• "Co mówi art. 5 Ustawy o ochronie danych osobowych (UODO) o zasadach przetwarzania danych?"
• "Wyszukaj 'ochrona danych osobowych' w polskim prawie (UODO/RODO)"
• "Jakie przepisy Kodeksu karnego dotyczą przestępstw komputerowych?"
• "Znajdź artykuły o wypowiedzeniu umowy o pracę w Kodeksie pracy"
• "What EU directives does the Polish Ustawa o krajowym systemie cyberbezpieczeństwa (KSC) implement?"
• "Which Polish laws implement the NIS2 Directive?"
• "Sprawdź, czy Ustawa Dz.U. 2018 poz. 1000 jest nadal w mocy"
• "Wyszukaj 'odpowiedzialność cywilna' w Kodeksie cywilnym"
• "Compare NIS2 incident reporting requirements with the Polish KSC transposition"
• "Znajdź orzeczenia sądowe dotyczące RODO z 2023 roku (premium)"

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What's Included

Verified data only -- every citation is validated against official sources (api.sejm.gov.pl, isap.sejm.gov.pl). 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 the Sejm ELI API (api.sejm.gov.pl) covering all Dziennik Ustaw publications
• Provisions are returned unchanged from SQLite FTS5 database rows
• Zero LLM summarization or paraphrasing -- the database contains regulation text, not AI interpretations

Smart Context Management:

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

Technical Architecture:

Sejm ELI API (api.sejm.gov.pl) --> Parse --> SQLite --> FTS5 snippet() --> MCP response
                                     ^                        ^
                              Provision parser         Verbatim database query

Traditional Research vs. This MCP

Traditional: Search ISAP -> Download PDF -> Ctrl+F -> Cross-reference with RODO -> Check EUR-Lex -> Repeat

This MCP: "Jakie unijne przepisy stanowią podstawę art. 22 UODO o zautomatyzowanym podejmowaniu decyzji?" -> 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

Poland is a full EU member state (accession 2004). Polish law has systematic EU cross-references across data protection, cybersecurity, financial regulation, and labour law.

Key EU Acts with Polish Implementations

1. GDPR (2016/679) -- UODO (Ustawa z dnia 10 maja 2018 r. o ochronie danych osobowych)
2. NIS2 Directive (2022/2555) -- Ustawa o KSC (amendment in progress as of 2026)
3. eIDAS Regulation (910/2014) -- Ustawa o usługach zaufania (2016)
4. AI Act (2024/1689) -- Direct application
5. DORA (2022/2554) -- Direct application in financial sector

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 Polish legal databases:

• Sejm ELI API -- Official Polish Parliament legislative database (European Legislation Identifier)
• ISAP -- Internetowy System Aktów Prawnych
• EUR-Lex -- Official EU law database (metadata only)

Data Provenance

Automated Freshness Checks (Daily)

A daily GitHub Actions workflow monitors all data sources:

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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 Sejm ELI API (Dziennik Ustaw) publications. However:

• This is a research tool, not a substitute for professional legal counsel
• Court case coverage is limited (premium tier) -- do not rely solely on this for case law research
• Verify critical citations against primary sources for court filings
• EU cross-references are extracted from Polish statute text, not EUR-Lex full text
• Regulatory guidance (UODO decisions) has limited coverage in the free tier

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. For guidance on professional obligations, consult the Naczelna Rada Adwokacka (Polish Bar Council). See PRIVACY.md for compliance guidance.

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Documentation

• EU Integration Guide -- Detailed EU cross-reference documentation
• EU Usage Examples -- Practical EU lookup examples
• Security Policy -- Vulnerability reporting and scanning details
• Disclaimer -- Legal disclaimers and professional use notices
• Privacy -- Client confidentiality and data handling

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Development

Setup

git clone https://github.com/Ansvar-Systems/polish-law-mcp
cd polish-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 Sejm ELI API
npm run build:db                  # Rebuild SQLite database
npm run drift:detect              # Run drift detection against anchors
npm run check-updates             # Check for amendments and new statutes
npm run census                    # Generate coverage census report

Performance

• Search Speed: <100ms for most FTS5 queries
• Database Size: ~332 MB (efficient, portable)
• Reliability: 100% ingestion success rate across 8,943 acts

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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. Full regulatory text with article-level search. npx @ansvar/eu-regulations-mcp

@ansvar/polish-law-mcp (This Project)

Query 8,943 Polish statutes directly from Claude -- UODO, Kodeks karny, Kodeks cywilny, Kodeks pracy, KSC, and more. Full provision text with EU cross-references. npx @ansvar/polish-law-mcp

@ansvar/french-law-mcp

Query 3,958 French statutes -- Code civil, Code pénal, loi Informatique et Libertés, and more. npx @ansvar/french-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

@ansvar/sanctions-mcp

Offline-capable sanctions screening -- OFAC, EU, UN sanctions lists. pip install ansvar-sanctions-mcp

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Contributing

Contributions welcome! See CONTRIBUTING.md for guidelines.

Priority areas:

• Court case law expansion (Sąd Najwyższy, Naczelny Sąd Administracyjny)
• UODO decisions and guidance ingestion
• Historical statute versions and amendment tracking
• EU implementation gap analysis for NIS2 KSC update

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Roadmap

• Core statute database with FTS5 search
• Full corpus ingestion (8,943 acts, 161,705 provisions) from Dziennik Ustaw 1918-2026
• EU law integration tools
• Vercel Streamable HTTP deployment
• npm package publication
• Premium case law (23,043 decisions)
• Premium preparatory works (43,312 documents)
• Premium agency guidance (10 UODO documents)
• Sąd Najwyższy full case law coverage
• UODO guidance documents expansion
• Historical statute versions (amendment tracking)
• NIS2 KSC amendment tracking

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Citation

If you use this MCP server in academic research:

@software{polish_law_mcp_2026,
  author = {Ansvar Systems AB},
  title = {Polish Law MCP Server: Production-Grade Legal Research Tool},
  year = {2026},
  url = {https://github.com/Ansvar-Systems/polish-law-mcp},
  note = {8,943 Polish acts with 161,705 provisions from Dziennik Ustaw (1918-2026) and EU law cross-references}
}

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License

Apache License 2.0. See LICENSE for details.

Data Licenses

• Statutes & Legislation: Kancelaria Sejmu RP (public domain -- Sejm ELI open data)
• 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 Polish law -- turns out everyone building for the Polish and EU markets has the same research frustrations.

So we're open-sourcing it. Navigating 8,943 acts in the Dziennik Ustaw shouldn't require a law degree.

ansvar.eu -- Stockholm, Sweden

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