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://argentine-law-mcp.vercel.app/mcp

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

GitHub Copilot — add to VS Code settings.json:

{
  "github.copilot.chat.mcp.servers": {
    "argentine-law": {
      "type": "http",
      "url": "https://argentine-law-mcp.vercel.app/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

Category	Count	Details
Leyes Nacionales	Initial release	Database being populated from InfoLEG/SAIJ
Provisions	In progress	Full-text searchable with FTS5
Premium: Case law	0 (free tier)	Jurisprudencia expansion planned
Premium: Preparatory works	0 (free tier)	Antecedentes parlamentarios planned
Premium: Agency guidance	0 (free tier)	AAIP resolutions and guidance planned
Database Size	Growing	Optimized SQLite, portable
Daily Updates	Automated	Freshness checks against InfoLEG

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 Approach	This MCP Server
Search InfoLEG by número de ley	Search by plain Spanish: "protección datos consentimiento"
Navigate multi-chapter statutes manually	Get the exact provision with context
Manual cross-referencing between leyes	build_legal_stance aggregates across sources
"¿Está vigente esta ley?" → check manually	check_currency tool → answer in seconds
Find EU adequacy references → dig through EUR-Lex	get_eu_basis → linked EU acts instantly
No API, no integration	MCP protocol → AI-native

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)

Tool	Description
search_legislation	FTS5 full-text search across provisions with BM25 ranking. Supports quoted phrases, boolean operators, prefix wildcards
get_provision	Retrieve specific provision by ley number + article (e.g., "25326" + "art. 5")
check_currency	Check if a ley is in force, amended, or repealed
validate_citation	Validate citation against database — zero-hallucination check. Supports "Ley 25.326, art. 4", "CCyCN art. 1709"
build_legal_stance	Aggregate citations from multiple leyes for a legal topic
format_citation	Format citations per Argentine conventions (full/short/pinpoint)
list_sources	List all available statutes with metadata, coverage scope, 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 that an Argentine statute aligns with (e.g., Ley 25.326 — GDPR adequacy)
get_argentine_implementations	Find Argentine laws corresponding to a specific EU act
search_eu_implementations	Search EU documents with Argentine alignment counts
get_provision_eu_basis	Get EU law references for a specific provision
validate_eu_compliance	Check alignment status of Argentine statutes against EU directives

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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

Field	Value
Authority	Ministerio de Justicia y Derechos Humanos de la Nación
Retrieval method	InfoLEG API and SAIJ database
Language	Spanish
License	Public domain (obra de dominio público del Estado Nacional)
Coverage	Leyes nacionales — initial release, expanding

Automated Freshness Checks (Daily)

A daily GitHub Actions workflow monitors data sources:

Check	Method
Ley amendments	InfoLEG date comparison
New leyes	Boletín Oficial publication monitoring
Repealed statutes	Status change detection

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:

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
Socket.dev	Supply chain attack detection	PRs
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 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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_{Built with care in Stockholm, Sweden}