Brazilian Law MCP Server

The LexML (Presidência da República) alternative for the AI age.

Pesquise 2.471 leis federais brasileiras -- da LGPD (Lei Geral de Proteção de Dados) e o Marco Civil da Internet ao Código Penal, Código Civil e a CLT (Consolidação das Leis do Trabalho) -- diretamente do Claude, Cursor ou qualquer cliente compatível com MCP.

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

Built by Ansvar Systems -- Stockholm, Sweden

Por que isso existe

A pesquisa jurídica federal brasileira está espalhada entre lexml.gov.br, planalto.gov.br, e jusbrasil.com.br, com legislação publicada no Diário Oficial da União. Seja você:

• Um advogado validando citações em uma petição ou contrato
• Um profissional de compliance verificando as obrigações da LGPD ou regulamentações da ANPD
• Um desenvolvedor legaltech construindo ferramentas sobre o direito brasileiro
• Um pesquisador rastreando legislação federal através de 2.471 leis

...você não deveria precisar de dezenas de abas no navegador e pesquisa manual em PDF. Pergunte ao Claude. Obtenha a disposição exata. Com contexto.

Este servidor MCP torna o direito brasileiro consultável, referenciável e legível por IA.

Quick Start

Use Remotely (No Install Needed)

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

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

Claude Desktop -- add to claude_desktop_config.json:

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

GitHub Copilot -- add to VS Code settings.json:

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

Use Locally (npm)

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

Cursor / VS Code:

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

Exemplos de Consultas

Uma vez conectado, pergunte naturalmente:

• "Pesquisar 'proteção de dados pessoais' na LGPD (Lei 13.709/2018)"
• "O que diz o artigo 46 da LGPD sobre segurança dos dados?"
• "Quais são as penalidades previstas no Código Penal para crimes cibernéticos?"
• "Encontrar disposições sobre rescisão contratual na CLT"
• "O Marco Civil da Internet ainda está em vigor?"
• "Pesquisar obrigações de consentimento no Código Civil"
• "Como a LGPD se alinha com o GDPR europeu em termos de bases legais?"
• "Validar a citação: Lei 13.709/2018, art. 7º, inciso I"
• "Construir uma posição jurídica sobre direitos dos titulares de dados no Brasil"
• "Encontrar disposições sobre proteção ao consumidor no Código de Defesa do Consumidor"

What's Included

Key Laws Included

Verified data only -- every citation is validated against official sources (lexml.gov.br, planalto.gov.br). Zero LLM-generated content.

LGPD and GDPR Alignment

Brazil's LGPD (Lei Geral de Proteção de Dados) is explicitly modelled on the EU GDPR. The structural and conceptual alignment is significant:

The EU tools in this MCP reveal alignment between LGPD and GDPR provisions -- useful for multi-jurisdictional compliance work involving both Brazilian and EU data subjects.

Note on adequacy: Brazil does not yet have a formal EU adequacy decision (unlike Canada under PIPEDA). International data transfers from EU to Brazil require appropriate safeguards (SCCs, BCRs). Use the validate_eu_compliance tool to assess alignment for specific provisions.

Why This Works

Verbatim Source Text (No LLM Processing):

• All statute text is ingested from lexml.gov.br and planalto.gov.br official sources
• Provisions are returned unchanged from SQLite FTS5 database rows
• Zero LLM summarization or paraphrasing -- the database contains law text, not AI interpretations

Smart Context Management:

• Search returns ranked provisions with BM25 scoring (safe for context)
• Provision retrieval gives exact text by law number + article
• Cross-references help navigate without loading everything at once

Technical Architecture:

LexML / Planalto --> Parse --> SQLite --> FTS5 snippet() --> MCP response
                       ^                        ^
                Provision parser         Verbatim database query

Traditional Research vs. This MCP

Tradicional: Pesquisar no Planalto --> Navegar no HTML --> Ctrl+F --> Verificar no Diário Oficial --> Cruzar com EUR-Lex para comparação LGPD/GDPR --> Repetir

Este MCP: "Quais são as bases legais para tratamento de dados pessoais na LGPD e como se comparam com o GDPR?" --> Concluído.

Available Tools (13)

Core Legal Research Tools (8)

EU Law Integration Tools (5)

Data Sources & Freshness

All content is sourced from authoritative Brazilian legal databases:

• LexML Brasil -- Official Brazilian legal document repository (Presidência da República)
• Planalto -- Presidential Portal, official consolidated federal legislation
• Câmara dos Deputados -- Chamber of Deputies legislative documents and preparatory works
• Senado Federal -- Federal Senate legislative records

Data Provenance

Automated Freshness Checks

A GitHub Actions workflow monitors all 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 LexML (Presidência da República) and Planalto. However:

• This is a research tool, not a substitute for professional legal counsel
• Court case coverage is not included -- do not rely solely on this for jurisprudência
• Verify critical citations against primary sources for official proceedings
• EU cross-references reflect alignment relationships; Brazil does not yet have EU adequacy status
• State-level legislation is not included -- this covers federal Acts only
• For professional legal advice in Brazil, consult a member of the Ordem dos Advogados do Brasil (OAB)

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.

Development

Setup

git clone https://github.com/Ansvar-Systems/brazil-law-mcp
cd brazil-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 laws from LexML/Planalto
npm run build:db            # Rebuild SQLite database
npm run check-updates       # Check for amendments and new laws

Performance

• Search Speed: <100ms for most FTS5 queries
• Database Size: ~50 MB (efficient, portable)
• Reliability: 100% ingestion success rate across 2,471 Acts

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. Pair with this server for LGPD-GDPR alignment analysis. npx @ansvar/eu-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

@ansvar/sanctions-mcp

Offline-capable sanctions screening -- OFAC, EU, UN sanctions lists. pip install ansvar-sanctions-mcp

70+ national law MCPs covering Australia, Brazil, Canada, China, Denmark, Finland, France, Germany, Ghana, Iceland, India, Ireland, Israel, Italy, Japan, Kenya, Netherlands, Nigeria, Norway, Singapore, Slovenia, South Korea, Sweden, Switzerland, Thailand, UAE, UK, and more.

Contributing

Contributions welcome! See CONTRIBUTING.md for guidelines.

Priority areas:

• Court case law expansion (STF, STJ jurisprudência)
• ANPD guidance documents and resolutions
• State-level privacy law summaries
• Historical law versions and amendment tracking
• Regulatory agency (ANATEL, BACEN, CVM) instruments

Roadmap

• Core law database with FTS5 search
• Full corpus ingestion (2,471 laws, 28,585 provisions)
• Preparatory works (116,256 parliamentary documents)
• EU/LGPD-GDPR alignment tools
• Vercel Streamable HTTP deployment
• npm package publication
• Court case law expansion (STF, STJ)
• ANPD resolution and guidance coverage
• Historical law versions (amendment tracking)
• State-level legislation

Citation

If you use this MCP server in academic research:

@software{brazil_law_mcp_2026,
  author = {Ansvar Systems AB},
  title = {Brazilian Law MCP Server: AI-Powered Legal Research Tool},
  year = {2026},
  url = {https://github.com/Ansvar-Systems/brazil-law-mcp},
  note = {2,471 Brazilian federal laws with 28,585 provisions and 116,256 preparatory works documents}
}

License

Apache License 2.0. See LICENSE for details.

Data Licenses

• Statutes & Legislation: Presidência da República / LexML (public domain)
• Preparatory Works: Câmara dos Deputados / Senado Federal (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 started as our internal reference tool for Brazilian legal research -- turns out everyone building compliance tools across Brazil and EU jurisdictions has the same research frustrations.

So we're open-sourcing it. Navigating 2,471 federal laws and mapping LGPD to GDPR shouldn't require hours of manual cross-referencing.

ansvar.eu -- Stockholm, Sweden