Argentine Law MCP Server

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

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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.

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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-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'"

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What's Included

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

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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.

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Available Tools (13)

Core Legal Research Tools (8)

EU Law Integration Tools (5)

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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.

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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.

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Security

This project uses multiple layers of automated security scanning:

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 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.

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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

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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/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.

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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

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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

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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}
}

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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)

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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

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