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

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.

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

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"]
    }
  }
}

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?"

What's Included

Verified data only -- every citation is validated against official sources (BOE, boe.es). Zero LLM-generated content.

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: 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.

Available Tools (13)

Core Legal Research Tools (8)

EU Law Integration Tools (5)

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.

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.

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

Automated Freshness Checks (Daily)

A daily GitHub Actions workflow monitors all data sources:

Security

This project uses multiple layers of automated security scanning:

See SECURITY.md for the full policy and vulnerability reporting.

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.

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

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

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

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

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

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}
}

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)

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