Spanish Law MCP Server

The Spanish law corpus is now served through the Ansvar Gateway. Connect your AI assistant (Claude, Copilot, Cursor, custom MCP client) to https://gateway.ansvar.eu/mcp — one OAuth connection, free tier available, covering this corpus plus EU regulations, national law across 28 audited jurisdictions, and CVE/security intelligence, every result with a verbatim source citation. Start at https://ansvar.eu/docs/quickstart

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 signup flow (setup details: ansvar.eu/docs/quickstart). After signup, your client is bound to your account; tier (free / premium / team / company) determines fan-out, quota, and which downstream MCPs are reachable.

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 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.

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

More Ansvar MCPs

Full fleet coverage at ansvar.eu/coverage.

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

• 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: Spanish-TRLPI-Art-13 -- Spanish statutory public domain. TRLPI Art. 13 (Real Decreto Legislativo 1/1996) provides that laws or regulations, draft bills, decisions of judicial bodies and acts of public authorities, as well as official translations of all such texts, are not the subject of intellectual property protection. Verified verbatim 2026-05-17 -- see docs/audits/2026-05-17-eu-copyright-statutory-works-batch-1b-DE-IE-IT-NL-ES.md. Catalog entry: Spanish-TRLPI-Art-13 in infrastructure/attribution-licenses.json.
• EU Metadata: EUR-Lex (EU public domain, Decision 2011/833/EU)

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