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Built for the Claude Code community with Claude Code by @mertduzgun

Independent project, not affiliated with Anthropic

Nexus Legal

djtellado/nexus-legal-mcp
1authSTDIO, HTTPregistry active
Summary

Connects Claude to Nexus Legal's ISO 31000 risk analysis engine across 31 jurisdictions. You get 11 tools: full legal analysis with certainty locks (L1-L5), contract drafting, Monte Carlo litigation simulation, case law search, administrative doctrine retrieval, adversarial red teaming, and cross-border comparisons. Each analysis returns structured reports with audit trails and anonymized PII via their gatekeeper pipeline. Runs on Railway's EU infrastructure with zero retention, processes in RAM, costs 1-5 credits per operation depending on complexity. Install via npx with your MCP API key from their developer portal. Useful when you need defensible legal reasoning with jurisdictional precision baked into your Claude workflow instead of copying text between browser tabs.

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@nexus-legal/mcp

Servidor MCP (Model Context Protocol) de Nexus Legal — expone 11 capabilities jurídicas especializadas a Claude Desktop, Claude Code, Cursor y cualquier otro cliente compatible con MCP.

¿Qué es esto? Conectas tu Claude con Nexus en 30 segundos, y a partir de ese momento Claude puede invocar análisis jurídico ISO 31000 sobre 31 jurisdicciones, simulación Monte Carlo de litigación, búsqueda de jurisprudencia, redacción de escritos, doctrina administrativa, red team adversarial y comparativas multi-jurisdiccionales (Cross-Border) sin salir de la conversación.


Instalación rápida

1. Genera una clave MCP

Entra a nexusquantum.legal/developers, elige "Servidor MCP", dale un nombre (ej. "MacBook personal") y pulsa + Crear clave MCP. Copia la clave nlk_... — solo se enseña una vez.

2. Configura tu cliente

Claude Desktop (macOS)

Edita ~/Library/Application Support/Claude/claude_desktop_config.json:

{
  "mcpServers": {
    "nexus-legal": {
      "command": "npx",
      "args": ["-y", "@nexus-legal/mcp"],
      "env": {
        "NEXUS_API_KEY": "nlk_TU_CLAVE_AQUI"
      }
    }
  }
}

Reinicia Claude Desktop. Verás un icono 🔌 en el chat con las 11 tools de Nexus disponibles.

Claude Desktop (Windows)

Edita %APPDATA%\Claude\claude_desktop_config.json con el mismo contenido.

Claude Code (CLI)

claude mcp add nexus-legal -- npx -y @nexus-legal/mcp
# Después establece tu key:
export NEXUS_API_KEY=nlk_TU_CLAVE_AQUI

Cursor

Edita ~/.cursor/mcp.json:

{
  "mcpServers": {
    "nexus-legal": {
      "command": "npx",
      "args": ["-y", "@nexus-legal/mcp"],
      "env": { "NEXUS_API_KEY": "nlk_TU_CLAVE_AQUI" }
    }
  }
}

3. Pruébalo

En Claude Desktop, escribe:

Analiza este contrato con Nexus en jurisdicción ES, rama mercantil, perfil conservador: «[pega aquí el texto del contrato]»

Claude llamará automáticamente a la tool nexus_analyze y te devolverá el informe con candados de certeza [L1]/[L2-J]/[L3-NV]/[L4] + señales bloqueantes [L5-C]/[L5-P] + bloque NEXUS-AUDIT-TRAIL.


Las 11 tools

ToolCapabilityCoste típico
nexus_analyzeAnálisis jurídico íntegro (Nodo A — ISO 31000)1-3 créditos
nexus_consultaConsulta jurídica libre con o sin documento1 crédito
nexus_draftRedacción de escrito jurídico (recurso, demanda, etc.)2-4 créditos
nexus_auditAuditoría cruzada de un análisis Nodo A (Nodo B)1-2 créditos
nexus_monte_carloSimulación Monte Carlo de escenarios (ISO 31000 §6)4 créditos
nexus_doctrinaBúsqueda de doctrina administrativa según jurisdicción1 crédito
nexus_opinionSegunda opinión multi-LLM sobre análisis previo2 créditos
nexus_redteamRed team adversarial (vulnerabilidades JSON estructurado)5 créditos
nexus_adversarialArgumentación adversarial en prosa sobre análisis previo2-3 créditos
nexus_cross_border_compareComparativa multi-jurisdiccional (2-15 países)2-4 créditos
nexus_jurisprudencia_searchBúsqueda semántica en corpus jurisprudencial multi-jurisdiccióngratis

Las 30+ jurisdicciones soportadas (ES, CO, MX, AR, CL, PE, UY, EC, BO, PY, VE, PA, GB, FR, DE, IT, PT, NL, CH, IE, AE, CA, AU, SG, JP, IN, HK, ZA, SA, BR, US con state overlays US-CA/US-NY/US-DE/US-TX, y MULTI para análisis cross-border).


Variables de entorno

VariableDefaultDescripción
NEXUS_API_KEY—Obligatoria. Clave nlk_... con scope mcp.
NEXUS_BASE_URLhttps://nexusquantum.legalPara entornos de prueba o self-hosted.
NEXUS_TIMEOUT_MS180000 (3 min)Timeout para análisis largos.

Privacidad y RGPD

  • Zero Retention en plataforma EU. Los documentos que envíes vía MCP procesan en RAM en Railway europe-west4-drams3a (Países Bajos) y NO se persisten en base de datos por defecto. La política Zero Retention de Nexus aplica al 100% del tráfico MCP igual que al tráfico web.
  • PII Gatekeeper. Antes de llegar al LLM, el backend anonimiza DNIs, IBANs, teléfonos, emails y cuentas con tokens reversibles ([DNI_1], [ACCOUNT_3]...). El cliente MCP solo ve el output ya re-identificado por nuestro pipeline.
  • Auditoría. Cada tool call queda registrada en analysis_costs y api_usage_stats (con via_api_key_id) para facturación y trazabilidad.

Soporte

  • Email: support@nexusquantum.legal
  • Documentación: https://nexusquantum.legal/developers
  • Issues: https://github.com/djtellado/nexus-legal-prod/issues

Licencia

MIT

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Configuration

NEXUS_API_KEY*secret

Personal API key (format `nlk_*`) with `mcp` scope. Generate one at https://nexusquantum.legal/developers (select 'Servidor MCP' when creating the key).

NEXUS_BASE_URLdefault: https://nexusquantum.legal

Override base URL of the Nexus backend. Defaults to https://nexusquantum.legal. Change only for self-hosted or staging environments.

NEXUS_TIMEOUT_MSdefault: 180000

HTTP timeout in milliseconds for long-running analyses. Default 180000 (3 minutes).

Registryactive
Package@nexus-legal/mcp
TransportSTDIO, HTTP
AuthRequired
UpdatedJun 7, 2026
View on GitHub