Czech Law MCP Server

The ASPI (Sbírka zákonů) alternative for the AI age.

Query 45,899 Czech statutes — from zákon č. 110/2019 Sb. (ochrana osobních údajů) and the Trestní zákoník to the Občanský zákoník, zákon o kybernetické bezpečnosti, and more — directly from Claude, Cursor, or any MCP-compatible client.

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

Built by Ansvar Systems -- Stockholm, Sweden

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Why This Exists

Czech legal research is scattered across e-Sbírka, zakonyprolidi.cz, ASPI, and EUR-Lex. Whether you're:

• A lawyer validating citations in a brief or smlouva
• A compliance officer checking obligations under zákon č. 110/2019 Sb. or zákon č. 181/2014 Sb.
• A legal tech developer building tools on Czech law
• A researcher tracing legislative history from důvodová zpráva to zákon

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

This MCP server makes Czech 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-cz/mcp

Client	How to Connect
Claude.ai	Settings > Connectors > Add Integration > paste URL
Claude Code	claude mcp add czech-law --transport http https://mcp.ansvar.eu/law-cz/mcp
Claude Desktop	Add to config (see below)
GitHub Copilot	Add to VS Code settings (see below)

Claude Desktop — add to claude_desktop_config.json:

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

GitHub Copilot — add to VS Code settings.json:

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

Use Locally (npm)

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

Cursor / VS Code:

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

Example Queries

Once connected, just ask naturally (dotazy fungují v češtině nebo angličtině):

• "Co říká § 5 zákona č. 110/2019 Sb. o zpracování osobních údajů?"
• "Hledat 'ochrana osobních údajů' v české legislativě"
• "Je zákon č. 101/2000 Sb. o ochraně osobních údajů stále platný?"
• "Jaké jsou trestné činy v oblasti kybernetické kriminality v Trestním zákoníku (č. 40/2009 Sb.)?"
• "Které české zákony transponují směrnici NIS2?"
• "Hledat ustanovení o elektronickém podpisu v zákoně č. 297/2016 Sb."
• "Find provisions about data breach notification in Czech law"
• "Validate the citation 'zákon č. 110/2019 Sb., § 10'"

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What's Included

Category	Count	Details
Statutes	45,899 zákonů	Comprehensive Czech legislation from e-Sbírka
Provisions	461,231 paragrafů	Full-text searchable with FTS5
Premium: Case law	0 (free tier)	Judikatura expansion planned
Premium: Preparatory works	0 (free tier)	Důvodové zprávy expansion planned
Premium: Agency guidance	10,000 documents	ÚOOÚ, NBÚ, and regulatory guidance
Database Size	~1.2 GB	Optimized SQLite — comprehensive corpus
Daily Updates	Automated	Freshness checks against e-Sbírka

Verified data only — every citation is validated against official sources (e-Sbírka / zakonyprolidi.cz). Zero LLM-generated content.

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Why This Works

Verbatim Source Text (No LLM Processing):

• All statute text is ingested from e-Sbírka (e-sbirka.cz) 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 zákon number + paragraph
• Cross-references help navigate without loading everything at once

Technical Architecture:

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

Traditional Research vs. This MCP

Traditional Approach	This MCP Server
Search e-Sbírka by číslo zákona	Search by plain Czech: "ochrana osobních údajů souhlas"
Navigate multi-chapter statutes manually	Get the exact provision with context
Manual cross-referencing between zákony	build_legal_stance aggregates across sources
"Je tento zákon platný?" → check manually	check_currency tool → answer in seconds
Find EU basis → dig through EUR-Lex	get_eu_basis → linked EU directives instantly
No API, no integration	MCP protocol → AI-native

Traditional: Search e-Sbírka → Download PDF → Ctrl+F → Cross-reference with EUR-Lex → Check ÚOOÚ guidance → Repeat

This MCP: "Jaký je evropský základ § 10 zákona č. 110/2019 Sb. o ochraně osobních údajů?" → Done.

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Available Tools (13)

Core Legal Research Tools (8)

Tool	Description
search_legislation	FTS5 full-text search across 461,231 paragrafů with BM25 ranking. Supports quoted phrases, boolean operators, prefix wildcards
get_provision	Retrieve specific provision by zákon number + paragraph (e.g., "110/2019 Sb." + "§ 5")
check_currency	Check if a statute is in force (platný/neplatný), amended, or repealed
validate_citation	Validate citation against database — zero-hallucination check. Supports "zákon č. 110/2019 Sb., § 5"
build_legal_stance	Aggregate citations from multiple statutes for a legal topic
format_citation	Format citations per Czech conventions (full/short/pinpoint)
list_sources	List all available statutes with metadata, coverage scope, 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 Czech statute
get_czech_implementations	Find Czech laws implementing a specific EU act
search_eu_implementations	Search EU documents with Czech implementation counts
get_provision_eu_basis	Get EU law references for a specific provision
validate_eu_compliance	Check implementation status of Czech statutes against EU directives

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EU Law Integration

Czech Republic is an EU member state (since 2004). Czech legislation in data protection, cybersecurity, financial services, and e-commerce is built on EU directives and regulations. The EU bridge tools give you full bi-directional lookup.

Metric	Value
EU Member State	Yes — since 1 May 2004
EU References	Cross-references linking Czech statutes to EU law
Directives transposed	GDPR, NIS2, DORA, AI Act, eIDAS, PSD2, AML directives, and more
EUR-Lex Integration	Automated metadata fetching
ÚOOÚ supervision	Data protection regulatory framework fully covered

Key Czech EU Implementations

• Zákon č. 110/2019 Sb. — GDPR national implementation (zpracování osobních údajů)
• Zákon č. 181/2014 Sb. — Zákon o kybernetické bezpečnosti (NIS Directive transposition)
• Zákon č. 297/2016 Sb. — Zákon o službách vytvářejících důvěru (eIDAS transposition)
• Zákon č. 370/2017 Sb. — Platební styk (PSD2 transposition)

See EU_INTEGRATION_GUIDE.md for detailed documentation.

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Data Sources & Freshness

All content is sourced from authoritative Czech legal databases:

• e-Sbírka — Elektronická Sbírka zákonů a mezinárodních smluv (official electronic collection)
• zakonyprolidi.cz — Comprehensive Czech legal database
• EUR-Lex — Official EU law database (metadata only)

Data Provenance

Field	Value
Authority	Ministerstvo vnitra České republiky / e-Sbírka
Retrieval method	e-Sbírka official data export and open data
Language	Czech
License	Public domain (veřejná správa)
Coverage	45,899 statutes, 461,231 provisions
Last ingested	2026-02-28

Automated Freshness Checks (Daily)

A daily GitHub Actions workflow monitors e-Sbírka for changes:

Check	Method
Statute amendments	e-Sbírka date comparison across 45,899 statutes
New statutes	Sbírka zákonů publication monitoring
Repealed statutes	Platnost/neplatnost status change detection
EU reference staleness	Git commit timestamps — flagged if >90 days old

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:

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 e-Sbírka publications. However:

• This is a research tool, not a substitute for professional legal counsel
• Court case coverage is not included in the free tier — do not rely solely on this for judikatura research
• Verify critical citations against primary sources (e-Sbírka, Sbírka zákonů) for court filings
• EU cross-references are extracted from statute text and EUR-Lex metadata, not a complete implementation mapping

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 guidance consistent with Česká advokátní komora (Czech Bar Association) professional conduct standards.

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Development

Setup

git clone https://github.com/Ansvar-Systems/Czech-law-mcp
cd Czech-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 e-Sbírka
npm run ingest:all                # Full corpus ingestion (all laws, skip existing)
npm run ingest:opendata           # Ingest from open data sources
npm run build:db                  # Rebuild SQLite database
npm run drift:detect              # Run drift detection against anchors
npm run check-updates             # Check for amendments
npm run coverage:all-laws         # Check coverage against full e-Sbírka corpus

Performance

• Search Speed: <100ms for most FTS5 queries
• Database Size: ~1.2 GB (comprehensive — 45,899 statutes, 461,231 provisions)
• 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/czech-law-mcp (This Project)

Query 45,899 Czech statutes directly from Claude — zákon č. 110/2019 Sb., Trestní zákoník, Občanský zákoník, and more. Full provision text with EU cross-references. npx @ansvar/czech-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

70+ national law MCPs covering Austria, Belgium, Denmark, Estonia, Finland, France, Germany, Ireland, Italy, Luxembourg, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland, UK, and more.

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Contributing

Contributions welcome! See CONTRIBUTING.md for guidelines.

Priority areas:

• Court case law expansion (Ústavní soud, Nejvyšší soud, Nejvyšší správní soud)
• EU cross-reference expansion
• Historical statute versions and amendment tracking
• ÚOOÚ and NBÚ guidance documents
• Důvodové zprávy (legislative preparatory works)

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Roadmap

• Core statute database with FTS5 search (45,899 statutes, 461,231 provisions)
• EU law integration with bi-directional lookup
• Premium agency guidance dataset (10,000 documents)
• Vercel Streamable HTTP deployment
• npm package publication
• Judikatura (court case law) expansion
• Důvodové zprávy (preparatory works) coverage
• Full EU text integration (via @ansvar/eu-regulations-mcp)
• Historical statute versions (amendment tracking)

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Citation

If you use this MCP server in academic research:

@software{czech_law_mcp_2026,
  author = {Ansvar Systems AB},
  title = {Czech Law MCP Server: AI-Powered Legal Research Tool},
  year = {2026},
  url = {https://github.com/Ansvar-Systems/Czech-law-mcp},
  note = {45,899 Czech statutes with 461,231 provisions and EU law cross-references}
}

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License

Apache License 2.0. See LICENSE for details.

Data Licenses

• Statutes & Legislation: Ministerstvo vnitra České republiky / e-Sbírka (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 is part of our Central European coverage — alongside Slovak, Polish, and Hungarian law MCPs — ensuring that the full EU compliance picture is accessible from a single AI interface.

So we're open-sourcing it. Navigating 45,899 statutes and 461,231 provisions shouldn't require a law degree.

ansvar.eu -- Stockholm, Sweden

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