Lithuanian Law MCP Server

Lithuanian Law MCP Server

The e-Seimas alternative for the AI age.

Query 12,045 Lithuanian statutes -- from the Asmens duomenų teisinės apsaugos įstatymas and Baudžiamasis kodeksas to the Civilinis kodeksas, Darbo kodeksas, and more -- directly from Claude, Cursor, or any MCP-compatible client.

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

Built by Ansvar Systems -- Stockholm, Sweden

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Why This Exists

Lithuanian legal research is scattered across e-Seimas, TAR (Teisės aktų registras), and EUR-Lex. Whether you're:

• A lawyer validating citations in a brief or contract
• A compliance officer checking if a statute is still in force
• A legal tech developer building tools on Lithuanian law
• A researcher tracing legislative provisions across 12,045 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 Lithuanian 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-lt/mcp

Claude Desktop -- add to claude_desktop_config.json:

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

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

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

Use Locally (npm)

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

Cursor / VS Code:

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

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Example Queries

Once connected, just ask naturally:

• "Ieškoti 'asmens duomenų apsauga' -- kokias pareigas nustato ADTAĮ?"
• "Ar Baudžiamojo kodekso 196 straipsnis vis dar galioja?"
• "Rask nuostatas apie darbuotojų apsaugą Darbo kodekse"
• "Kokie ES teisės aktai įgyvendinti per Civilinį kodeksą?"
• "Kurie Lietuvos įstatymai įgyvendina BDAR?"
• "Patikrink nuorodą: DK 38 str. 1 d."
• "Pateik teisinę poziciją dėl duomenų apsaugos pažeidimų pagal ADTAĮ"
• "Ar Lietuvos kibernetinio saugumo įstatymas atitinka NIS2?"

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What's Included

Verified data only -- every citation is validated against official sources (TAR, e-Seimas). 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 TAR (Teisės aktų registras) official sources
• 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 statute number + article/section
• Cross-references help navigate without loading everything at once

Technical Architecture:

TAR API → Parse → SQLite → FTS5 snippet() → MCP response
            ↑                     ↑
     Provision parser      Verbatim database query

Traditional Research vs. This MCP

Traditional: Search TAR → Download PDF → Ctrl+F → Cross-reference with other statutes → Check EUR-Lex for EU basis → Repeat

This MCP: "Kokie ES teisės aktai yra ADTAĮ 3 str. pagrindas?" → 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

Lithuania is an EU member state. Lithuanian legislation directly transposes EU directives and implements EU regulations, creating a tight mapping between Lithuanian and EU law.

Key areas of EU-Lithuanian law alignment:

• GDPR (2016/679) -- implemented via the Asmens duomenų teisinės apsaugos įstatymas (ADTAĮ, Law No. XI-1374)
• NIS2 Directive (2022/2555) -- implemented via the Kibernetinio saugumo įstatymas
• eIDAS Regulation (910/2014) -- applicable directly; supplemented by national e-signature rules
• DORA (2022/2554) -- financial sector digital resilience obligations
• AI Act (2024/1689) -- EU regulation applicable directly across all member states

The EU bridge tools provide bi-directional lookup: find which Lithuanian statutes implement a given EU act, or find which EU acts underpin a given Lithuanian provision.

See EU_INTEGRATION_GUIDE.md for detailed documentation.

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Data Sources & Freshness

All content is sourced from authoritative Lithuanian legal databases:

• TAR -- Teisės aktų registras (Register of Legal Acts), the official Lithuanian legal database
• e-Seimas -- Lietuvos Respublikos Seimas (Lithuanian Parliament) legislative database
• EUR-Lex -- Official EU law database (metadata only)

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 TAR/e-Seimas publications. However:

• This is a research tool, not a substitute for professional legal counsel
• Verify critical citations against primary sources for court filings
• EU cross-references are extracted from Lithuanian statute text, not EUR-Lex full text
• Always confirm current in-force status via TAR before relying on a provision professionally

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. See PRIVACY.md for Lietuvos advokatūra (Lithuanian Bar Association) 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/Lithuanian-law-mcp
cd Lithuanian-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 TAR
npm run build:db            # Rebuild SQLite database
npm run check-updates       # Check for amendments and new statutes

Performance

• Search Speed: <100ms for most FTS5 queries
• Database Size: 262 MB (comprehensive corpus)
• Reliability: 100% ingestion success rate

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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/lithuanian-law-mcp (This Project)

Query 12,045 Lithuanian statutes directly from Claude -- ADTAĮ, BK, CK, DK, and more. Full provision text with EU cross-references. npx @ansvar/lithuanian-law-mcp

@ansvar/us-regulations-mcp

Query US federal and state compliance laws -- HIPAA, CCPA, SOX, GLBA, FERPA, and more. npx @ansvar/us-regulations-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

70+ national law MCPs covering Australia, Brazil, Canada, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Latvia, Netherlands, Norway, Poland, Sweden, and more.

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Contributing

Contributions welcome! See CONTRIBUTING.md for guidelines.

Priority areas:

• EU Regulations MCP integration (full EU law text, CJEU case law)
• Historical statute versions and amendment tracking
• Constitutional Court (Konstitucinis Teismas) case law expansion
• Administrative court decisions

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Roadmap

• Core statute database with FTS5 search
• Full corpus ingestion (12,045 statutes, 89,705 provisions)
• EU law integration tools
• Vercel Streamable HTTP deployment
• npm package publication
• Daily freshness checks
• Case law expansion (Supreme Court, Constitutional Court)
• Historical statute versions (amendment tracking)
• English translations for key statutes

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Citation

If you use this MCP server in academic research:

@software{lithuanian_law_mcp_2026,
  author = {Ansvar Systems AB},
  title = {Lithuanian Law MCP Server: Production-Grade Legal Research Tool},
  year = {2026},
  url = {https://github.com/Ansvar-Systems/Lithuanian-law-mcp},
  note = {Comprehensive Lithuanian legal database with 12,045 statutes and 89,705 provisions}
}

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License

Apache License 2.0. See LICENSE for details.

Data Licenses

• Statutes & Legislation: Lithuanian Government / TAR (public domain)
• 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 Lithuanian law -- turns out everyone building for the Baltic market has the same research frustrations.

So we're open-sourcing it. Navigating 12,045 statutes shouldn't require a law degree.

ansvar.eu -- Stockholm, Sweden

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