Spanish Law MCP Server

The BOE (Boletín Oficial del Estado) alternative for the AI age.

Query 12,181 Spanish statutes -- from la LOPDGDD y el RGPD, el Código Penal, and el Estatuto de los Trabajadores to el Código Civil, la Ley de Sociedades de Capital, and more -- directly from Claude, Cursor, or any MCP-compatible client.

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

Built by Ansvar Systems -- Stockholm, Sweden

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Why This Exists

Spanish legal research means navigating the Boletín Oficial del Estado, regional BOCAs, and EUR-Lex, then manually reconciling between national and EU law. Whether you're:

• A lawyer validating citations in a brief or contract
• A compliance officer checking LOPDGDD obligations or ENS requirements
• A legal tech developer building tools on Spanish law
• A researcher tracing legislative provisions across 12,181 national 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 Spanish 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-es/mcp

Client	How to Connect
Claude.ai	Settings > Connectors > Add Integration > paste URL
Claude Code	claude mcp add spanish-law --transport http https://mcp.ansvar.eu/law-es/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": {
    "spanish-law": {
      "type": "url",
      "url": "https://mcp.ansvar.eu/law-es/mcp"
    }
  }
}

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

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

Use Locally (npm)

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

Cursor / VS Code:

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

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Example Queries

Once connected, just ask naturally:

• "¿Qué dice el artículo 6 de la LOPDGDD sobre el tratamiento de datos personales?"
• "Búsqueda 'protección de datos' en el derecho español (LOPDGDD, RGPD)"
• "¿Qué artículos del Código Penal regulan los delitos informáticos?"
• "Encuentra disposiciones sobre despido improcedente en el Estatuto de los Trabajadores"
• "What EU directives does the LOPDGDD implement?"
• "Which Spanish laws implement the NIS2 Directive?"
• "Valida la cita 'Art. 197 CP' (Código Penal)"
• "Busca 'responsabilidad civil' en el Código Civil español"
• "Compare incident notification requirements under NIS2 and the Spanish transposition"
• "¿Está en vigor el Real Decreto-ley 14/2019 sobre medidas urgentes de administración digital?"

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What's Included

Category	Count	Details
Statutes	12,181 statutes	Comprehensive Spanish legislation from BOE
Provisions	297,760 articles	Full-text searchable with FTS5
Preparatory Works	12,193 documents	Premium tier -- exposiciones de motivos, proyectos de ley
Case Law	0 (free tier)	Reserved for future ingestion
Agency Guidance	0 (free tier)	Reserved for future ingestion
Database Size	~849 MB	Optimized SQLite, portable
Daily Updates	Automated	Freshness checks against BOE

Verified data only -- every citation is validated against official sources (BOE, boe.es). 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 BOE Datos Abiertos API (boe.es/datosabiertos)
• 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 identifier + article number
• Cross-references help navigate without loading everything at once

Technical Architecture:

BOE Datos Abiertos API --> Parse --> SQLite --> FTS5 snippet() --> MCP response
                            ^                        ^
                     Provision parser         Verbatim database query

Traditional Research vs. This MCP

Traditional Approach	This MCP Server
Search BOE by statute name	Search by plain Spanish: "protección datos personales"
Navigate multi-title statutes manually	Get the exact article with context
Manual cross-referencing between codes	build_legal_stance aggregates across sources
"¿Está este artículo vigente?" -> check manually	check_currency tool -> answer in seconds
Find EU basis -> dig through EUR-Lex	get_eu_basis -> linked EU directives instantly
Check BOE, EUR-Lex, AEPD separately	Daily automated freshness checks
No API, no integration	MCP protocol -> AI-native

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

This MCP: "¿Qué normativa europea da base al artículo 22 de la LOPDGDD sobre decisiones automatizadas?" -> Done.

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Available Tools (13)

Core Legal Research Tools (8)

Tool	Description
search_legislation	FTS5 full-text search across 297,760 provisions with BM25 ranking
get_provision	Retrieve specific provision by statute identifier + article number
validate_citation	Validate citation against database (zero-hallucination check)
build_legal_stance	Aggregate citations from statutes, preparatory works, and case law
format_citation	Format citations per Spanish 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 Spanish statute
get_spanish_implementations	Find Spanish laws implementing a specific EU act
search_eu_implementations	Search EU documents with Spanish 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

Spain is a full EU member state. Spanish law has systematic EU cross-references across data protection, cybersecurity, financial regulation, and consumer rights.

Metric	Value
EU Integration	Full EU member (accession 1986)
GDPR Implementation	LOPDGDD (Ley Orgánica 3/2018, AEPD oversight)
NIS2 Transposition	Real Decreto-ley + Ley de Seguridad de las Redes y Sistemas de Información
AI Act	Direct application (EU regulation, no transposition needed)
ENS	Esquema Nacional de Seguridad (Real Decreto 311/2022)
EUR-Lex Integration	Automated metadata fetching

Key EU Acts with Spanish Implementations

1. GDPR (2016/679) -- LOPDGDD (Ley Orgánica 3/2018) + AEPD decisions
2. NIS2 Directive (2022/2555) -- Ley de Ciberseguridad (transposition pending as of 2026)
3. eIDAS Regulation (910/2014) -- Ley 6/2020 (firma y certificados electrónicos)
4. AI Act (2024/1689) -- Direct application
5. DORA (2022/2554) -- Direct application in financial sector

See EU_INTEGRATION_GUIDE.md for detailed documentation.

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Data Sources & Freshness

All content is sourced from authoritative Spanish legal databases:

• BOE Datos Abiertos -- Boletín Oficial del Estado open data API
• EUR-Lex -- Official EU law database (metadata only)

Data Provenance

Field	Value
Authority	Agencia Estatal Boletín Oficial del Estado
Retrieval method	BOE Datos Abiertos REST API
Languages	Spanish (official language of law)
License	BOE open data (Reutilización de la información del sector público)
Coverage	12,181 consolidated statutes (national + regional)
Last ingested	2026-02-25

Automated Freshness Checks (Daily)

A daily GitHub Actions workflow monitors all data sources:

Source	Check	Method
Statute amendments	BOE API date comparison	All 12,181 statutes checked
New statutes	BOE publications (90-day window)	Diffed against database
Preparatory works	BOE proyecto de ley 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 BOE 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 case law research
• Verify critical citations against primary sources for court filings
• EU cross-references are extracted from Spanish statute text, not EUR-Lex full text
• Regional legislation (Comunidades Autónomas) may not be fully covered

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 Consejo General de la Abogacía Española. 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/spanish-law-mcp
cd spanish-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 BOE Datos Abiertos
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: ~849 MB (efficient, portable)
• Reliability: 100% ingestion success rate across 12,181 statutes

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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/spanish-law-mcp (This Project)

Query 12,181 Spanish statutes directly from Claude -- LOPDGDD, Código Penal, Estatuto de los Trabajadores, Código Civil, and more. Full provision text with EU cross-references. npx @ansvar/spanish-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 (Tribunal Supremo, Audiencia Nacional)
• AEPD decisions and guidance ingestion
• Historical statute versions and amendment tracking
• Autonomous community legislation coverage

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Roadmap

• Core statute database with FTS5 search
• Full corpus ingestion (12,181 statutes, 297,760 provisions)
• EU law integration tools
• Vercel Streamable HTTP deployment
• npm package publication
• Premium preparatory works (12,193 documents)
• Tribunal Supremo case law coverage
• AEPD guidance documents
• Historical statute versions (amendment tracking)
• Autonomous community legislation

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Citation

If you use this MCP server in academic research:

@software{spanish_law_mcp_2026,
  author = {Ansvar Systems AB},
  title = {Spanish Law MCP Server: Production-Grade Legal Research Tool},
  year = {2026},
  url = {https://github.com/Ansvar-Systems/spanish-law-mcp},
  note = {12,181 Spanish statutes with 297,760 provisions and EU law cross-references}
}

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License

Apache License 2.0. See LICENSE for details.

Data Licenses

• Statutes & Legislation: Agencia Estatal BOE (open data -- reutilización sector público)
• 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 Spanish law -- turns out everyone building for the Spanish and EU markets has the same research frustrations.

So we're open-sourcing it. Navigating 12,181 statutes shouldn't require a law degree.

ansvar.eu -- Stockholm, Sweden

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