Polish Law MCP Server

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One endpoint, one OAuth signup, access from any MCP-compatible client.

Connect

Claude Code (one line):

claude mcp add ansvar --transport http https://gateway.ansvar.eu/mcp

Claude Desktop / Cursor — add to claude_desktop_config.json (or mcp.json):

{
  "mcpServers": {
    "ansvar": {
      "type": "url",
      "url": "https://gateway.ansvar.eu/mcp"
    }
  }
}

Claude.ai — Settings → Connectors → Add custom connector → paste https://gateway.ansvar.eu/mcp

First request opens an OAuth flow at ansvar.eu/gateway. After signup, your client is bound to your account; tier (free / premium / team / company) determines fan-out, quota, and which downstream MCPs are reachable.

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Self-host this MCP

You can also clone this repo and build the corpus yourself. The schema, fetcher, and tool implementations all live here. What is not in the repo is the pre-built database — TDM and standards-licensing constraints on the upstream sources mean we host the corpus on Ansvar infrastructure rather than redistribute it as a public artifact.

Build your own: run this repo's ingestion script (entry-point varies per repo — typically scripts/ingest.sh, npm run ingest, or make ingest; check the repo root).

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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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

Category	Count	Details
Statutes (Ustawy)	8,943 acts	Dziennik Ustaw publications 1918-2026 from Sejm ELI API
Provisions	161,705 articles	Full-text searchable with FTS5
Case Law	23,043 decisions	Premium tier -- judicial decisions
Preparatory Works	43,312 documents	Premium tier -- druki sejmowe, rządowe projekty ustaw
Agency Guidance	10 documents	Premium tier -- UODO guidance
Database Size	~332 MB	Optimized SQLite, portable
Daily Updates	Automated	Freshness checks against Sejm ELI API

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 Approach	This MCP Server
Search ISAP by act name	Search by plain Polish: "ochrona danych osobowych"
Navigate multi-chapter acts manually	Get the exact provision with context
Manual cross-referencing between acts	build_legal_stance aggregates across sources
"Czy ta ustawa jest w mocy?" -> check manually	check_currency tool -> answer in seconds
Find EU basis -> dig through EUR-Lex	get_eu_basis -> linked EU directives instantly
Check ISAP, Dziennik Ustaw, EUR-Lex separately	Daily automated freshness checks
No API, no integration	MCP protocol -> AI-native

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)

Tool	Description
search_legislation	FTS5 full-text search across 161,705 provisions with BM25 ranking
get_provision	Retrieve specific provision by Dz.U. identifier + article number
validate_citation	Validate citation against database (zero-hallucination check)
build_legal_stance	Aggregate citations from statutes, case law, preparatory works
format_citation	Format citations per Polish conventions (full/short/pinpoint)
check_currency	Check if statute is in force, amended, or repealed
list_sources	List all available statutes with metadata and data provenance
about	Server info, capabilities, dataset statistics, and coverage summary

EU Law Integration Tools (5)

Tool	Description
get_eu_basis	Get EU directives/regulations underlying a Polish statute
get_polish_implementations	Find Polish laws implementing a specific EU act
search_eu_implementations	Search EU documents with Polish implementation counts
get_provision_eu_basis	Get EU law references for a specific provision
validate_eu_compliance	Check implementation status against EU directives

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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.

Metric	Value
EU Integration	Full EU member (accession 2004)
GDPR Implementation	UODO -- Ustawa o ochronie danych osobowych (2018, UODO oversight)
NIS2 Transposition	Ustawa o krajowym systemie cyberbezpieczeństwa (KSC, update pending)
AI Act	Direct application (EU regulation, no transposition needed)
EUR-Lex Integration	Automated metadata fetching

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

Field	Value
Authority	Kancelaria Sejmu RP (Polish Parliament Chancellery)
Retrieval method	Sejm ELI REST API (api.sejm.gov.pl)
Languages	Polish (official language of law)
License	Public domain (Sejm ELI open data)
Coverage	8,943 acts published in Dziennik Ustaw (1918-2026)
Last ingested	2026-02-25

Automated Freshness Checks (Daily)

A daily GitHub Actions workflow monitors all data sources:

Source	Check	Method
Statute amendments	Sejm ELI API date comparison	All 8,943 acts checked
New statutes	Dziennik Ustaw publications (90-day window)	Diffed against database
Preparatory works	Sejm druki API (30-day window)	New texts detected
EU reference staleness	Git commit timestamps	Flagged if >90 days old

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Security

This project uses multiple layers of automated security scanning:

Scanner	What It Does	Schedule
CodeQL	Static analysis for security vulnerabilities	Weekly + PRs
Semgrep	SAST scanning (OWASP top 10, secrets, TypeScript)	Every push
Gitleaks	Secret detection across git history	Every push
Trivy	CVE scanning on filesystem and npm dependencies	Daily
Docker Security	Container image scanning + SBOM generation	Daily
Socket.dev	Supply chain attack detection	PRs
OSSF Scorecard	OpenSSF best practices scoring	Weekly
Dependabot	Automated dependency updates	Weekly

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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More Ansvar MCPs

Full fleet at ansvar.eu/gateway.

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

• 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

Ansvar attribution code: PL-Statutory-PD. Basis: Ustawa o prawie autorskim Art. 4 — Polish statutory-PD carve-out for legislative and administrative acts.

• Statutes & Legislation: Kancelaria Sejmu RP — ISAP. Public domain under Art. 4 of the Polish Copyright Act, covering ustawy, rozporządzenia, obwieszczenia, and other legislative/administrative acts.
• EU Metadata: EUR-Lex (EU public-domain notice).

Coverage scope (narrow carve-out)

Art. 4 of the Polish Copyright Act is NARROW — it does not enumerate court decisions.

• IN-SCOPE under Art. 4: statutes (ustawy), drafts, regulations (rozporządzenia), administrative acts, official notices.
• OUT-OF-SCOPE under Art. 4: court decisions. These require a separate basis:
  • Civil judgments: K.p.c. Art. 9 (Code of Civil Procedure).
  • Criminal judgments: K.p.k. Art. 100 (Code of Criminal Procedure).
• Why this matters: This MCP ships the statute tier from ISAP under Art. 4. A case-law tier would require a separate licensing declaration.

See docs/audits/2026-05-17-eu-copyright-statutory-works-batch-4-LV-LT-PL.md in the Ansvar architecture-documentation repo for the verbatim Art. 4 text and the coverage analysis.

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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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_{Built with care in Stockholm, Sweden}