Argentine Law MCP Server

The InfoLEG alternative for the AI age.

Query Argentine federal legislation — from Ley 25.326 (protección de datos personales) and the Código Penal to the Código Civil y Comercial, leyes de ciberseguridad, defensa del consumidor, and more — directly from Claude, Cursor, or any MCP-compatible client.

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

Built by Ansvar Systems -- Stockholm, Sweden

Why This Exists

Argentine legal research is scattered across InfoLEG, SAIJ, the Boletín Oficial, and individual ministerial sites. Whether you're:

• A lawyer validating citations in a brief or contract
• A compliance officer checking obligations under Ley 25.326 or Ley 27.078
• A legal tech developer building tools on Argentine law
• A researcher tracing the legislative history of a ley nacional

...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 Argentine law searchable, cross-referenceable, and AI-readable.

Initial release: The Argentine law database is actively being populated from InfoLEG (servicios.infoleg.gob.ar) and SAIJ (saij.gob.ar). Coverage will expand with each release. See the roadmap below.

Quick Start

Use Remotely (No Install Needed)

Connect directly to the hosted version — zero dependencies, nothing to install.

Endpoint: https://mcp.ansvar.eu/law-ar/mcp

Claude Desktop — add to claude_desktop_config.json:

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

GitHub Copilot — add to VS Code settings.json:

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

Use Locally (npm)

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

Cursor / VS Code:

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

Example Queries

Once connected, just ask naturally (queries work in Spanish or English):

• "¿Qué dice el artículo 5 de la Ley 25.326 sobre el consentimiento para el tratamiento de datos personales?"
• "Buscar disposiciones sobre protección de datos personales en la legislación argentina"
• "¿Está vigente la Ley de Defensa del Consumidor (Ley 24.240)?"
• "¿Cuáles son los artículos del Código Penal sobre delitos informáticos?"
• "Buscar 'firma digital' en el Código Civil y Comercial"
• "¿Qué ley argentina implementa las obligaciones del GDPR para empresas con adecuación UE?"
• "Find provisions about cybercrime in Argentine law"
• "Validate the citation 'Ley 25.326, art. 4'"

What's Included

Verified data only — every citation is validated against official sources (InfoLEG / SAIJ). Zero LLM-generated content.

Why This Works

Verbatim Source Text (No LLM Processing):

• All statute text is ingested from InfoLEG (servicios.infoleg.gob.ar) and SAIJ (saij.gob.ar) 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 ley number + article
• Cross-references help navigate without loading everything at once

Technical Architecture:

InfoLEG/SAIJ API → Parse → SQLite → FTS5 snippet() → MCP response
                     ↑                     ↑
              Provision parser       Verbatim database query

Traditional Research vs. This MCP

Traditional: Search InfoLEG → Download PDF → Ctrl+F → Cross-reference with SAIJ → Check AAIP guidance → Repeat

This MCP: "¿Qué obligaciones impone la Ley 25.326 a los responsables de bases de datos?" → Done.

Available Tools (13)

Core Legal Research Tools (8)

EU Law Integration Tools (5)

EU Adequacy Status

Argentina is not an EU member state. However, Argentina holds EU adequacy status under GDPR Article 45 (Commission Decision 2003/490/EC, reaffirmed under GDPR), meaning personal data can flow from the EU to Argentina without additional safeguards for private-sector data processing.

Key alignment points:

• Ley 25.326 (Protección de Datos Personales) is the basis for the adequacy decision. It was modeled on EU Directive 95/46/EC and broadly aligns with GDPR principles.
• AAIP (Agencia de Acceso a la Información Pública) is the supervisory authority, equivalent to an EU DPA.
• Argentina is updating Ley 25.326 to align further with GDPR as adequacy decisions are reviewed.

The EU bridge tools allow you to explore these alignment relationships — checking which Argentine provisions correspond to EU requirements, and vice versa.

Note: EU cross-references reflect alignment and adequacy relationships, not transposition. Argentina adopts its own legislative approach.

Data Sources & Freshness

All content is sourced from authoritative Argentine legal databases:

• InfoLEG — Información Legislativa y Documental, Ministerio de Justicia
• SAIJ — Sistema Argentino de Información Jurídica
• Boletín Oficial — Official gazette for promulgation dates

Data Provenance

Automated Freshness Checks (Daily)

A daily GitHub Actions workflow monitors data sources:

Verified data only — every citation is validated against official sources. Zero LLM-generated content.

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 InfoLEG and SAIJ official publications. However:

• This is a research tool, not a substitute for professional legal counsel
• Initial release — law database is being populated. Do not rely on this tool as an exhaustive source until coverage is complete
• Court case coverage is not included in the free tier — do not rely solely on this for jurisprudencia research
• Verify critical citations against primary sources (InfoLEG, Boletín Oficial) for court filings
• EU cross-references reflect alignment and adequacy relationships, not transposition

Before using professionally, read: DISCLAIMER.md | SECURITY.md

Client Confidentiality

Queries go through the Claude API. For privileged or confidential matters, use on-premise deployment. Consult the Colegio Público de Abogados de la Capital Federal or the Federación Argentina de Colegios de Abogados (FACA) guidance on technology use in legal practice.

Development

Setup

git clone https://github.com/Ansvar-Systems/argentine-law-mcp
cd argentine-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 leyes from InfoLEG/SAIJ
npm run build:db         # Rebuild SQLite database
npm run drift:detect     # Run drift detection against anchors
npm run check-updates    # Check for source updates
npm run census           # Generate coverage census

Performance

• Search Speed: <100ms for most FTS5 queries
• Database Size: Optimized SQLite (growing)
• Reliability: 100% ingestion success rate

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/argentine-law-mcp (This Project)

Query Argentine federal legislation directly from Claude — Ley 25.326, Código Penal, CCyCN, and more. Full provision text with EU adequacy cross-references. npx @ansvar/argentine-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 Australia, Brazil, Canada, Chile, Colombia, Denmark, Finland, France, Germany, Ireland, Italy, Japan, Mexico, Netherlands, Norway, Portugal, Singapore, Spain, Sweden, Switzerland, UAE, UK, and more.

Contributing

Contributions welcome! See CONTRIBUTING.md for guidelines.

Priority areas:

• InfoLEG full corpus ingestion (leyes nacionales)
• SAIJ jurisprudencia coverage
• AAIP guidance documents and resolutions
• Reglamentos and decretos
• Historical ley versions and amendment tracking

Roadmap

• Core MCP server architecture with FTS5 search
• EU/international law alignment tools (adequacy-aware)
• Vercel Streamable HTTP deployment
• npm package publication
• Full InfoLEG corpus ingestion (22,800+ leyes nacionales)
• SAIJ jurisprudencia coverage
• AAIP guidance documents
• Amendment tracking and historical versions
• Reglamentos and decretos reglamentarios

Citation

If you use this MCP server in academic research:

@software{argentine_law_mcp_2026,
  author = {Ansvar Systems AB},
  title = {Argentine Law MCP Server: AI-Powered Legal Research Tool},
  year = {2026},
  url = {https://github.com/Ansvar-Systems/argentine-law-mcp},
  note = {Argentine federal law database with EU adequacy cross-references}
}

License

Apache License 2.0. See LICENSE for details.

Data Licenses

• Leyes Nacionales: Ministerio de Justicia y Derechos Humanos de la Nación (public domain)
• EU Metadata: EUR-Lex (EU public domain)

About Ansvar Systems

We build AI-accelerated compliance and legal research tools for the global market. This MCP server is part of our mission to make legal research accessible across jurisdictions — covering the full Americas alongside our European fleet.

So we're open-sourcing it. Navigating Argentina's legislative corpus shouldn't require a law degree.

ansvar.eu -- Stockholm, Sweden