Lithuanian Law MCP Server

▶ Try this MCP instantly via Ansvar Gateway

50 free queries/day · no card required · OAuth signup at ansvar.eu/gateway

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 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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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

Category	Count	Details
Statutes	12,045 statutes	Comprehensive Lithuanian legislation from TAR
Provisions	89,705 sections	Full-text searchable with FTS5
EU Cross-References	Included	Directives and regulations linked to Lithuanian law
Database Size	262 MB	Optimized SQLite, portable
Daily Updates	Automated	Freshness checks against TAR (e-tar.lt)

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 Approach	This MCP Server
Search e-Seimas by statute number	Search by plain Lithuanian: "asmens duomenys sutikimas"
Navigate multi-chapter statutes manually	Get the exact provision with context
Manual cross-referencing between laws	build_legal_stance aggregates across sources
"Is this statute still in force?" → check manually	check_currency tool → answer in seconds
Find EU basis → dig through EUR-Lex	get_eu_basis → linked EU directives instantly
Check multiple sites for updates	Daily automated freshness checks
No API, no integration	MCP protocol → AI-native

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)

Tool	Description
search_legislation	FTS5 full-text search across 89,705 provisions with BM25 ranking
get_provision	Retrieve specific provision by statute identifier + article/section
validate_citation	Validate citation against database -- zero-hallucination check
build_legal_stance	Aggregate citations from multiple statutes for a legal topic
format_citation	Format citations per Lithuanian 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 that underpin a Lithuanian statute
get_lithuanian_implementations	Find Lithuanian laws implementing a specific EU act
search_eu_implementations	Search EU documents with Lithuanian implementation counts
get_provision_eu_basis	Get EU law references for a specific provision
validate_eu_compliance	Check implementation status of Lithuanian statutes against EU directives

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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.

Metric	Value
EU Member State	Since 2004
Legal System	Civil law (continental European tradition)
Official Gazette	TAR (Teisės aktų registras)
EUR-Lex Integration	Automated metadata fetching

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:

Source	Check	Method
Statute amendments	TAR API date comparison	All 12,045 statutes checked
New statutes	TAR publications (90-day window)	Diffed against database
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 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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More Ansvar MCPs

Full fleet at ansvar.eu/gateway.

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

• 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: LT-Statutory-PD — Lithuanian statutory public domain under Autorių teisių ir gretutinių teisių įstatymas 5 str. (ATGTĮ), which excludes legal acts, official documents of administrative, legal or regulatory nature (decisions, rulings, regulations, norms, territorial-planning documents), their official translations, officially registered drafts of legal acts, and folklore works from copyright protection. Verbatim basis: WIPO Lex Lithuanian PDF (consolidated through XIV-970/2022). Commercial reuse permitted, no attribution required. The ATGTĮ point 4 covering officially registered drafts of legal acts is the widest preparatory-doc clause in the EU set. Verified 2026-05-17.
• 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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_{Built with care in Stockholm, Sweden}