Corpus Iuris — Mexican law for AI agents

Mexican law for AI agents. Search 6,710 federal and state statutes, 311,701 Supreme Court tesis and 11,708 precedents — with verifiable citations, dated validity and a public URL for every document.

The problem

AIs invent Mexican law. They cite tesis with registration numbers that don't exist, articles that were repealed, and jurisprudence that is actually an isolated tesis. In litigation, that costs a case.

Related MCP server: saij-mcp

The solution

A Mexican legal corpus queryable via API or MCP, where every result carries the actual text, its dated validity and a citable public URL.

Connect in one click (MCP)

Remote MCP server with OAuth 2.0 (dynamic registration RFC 7591 + PKCE S256):

https://api.corpusiuris.mx/mcp

Claude Desktop / Claude.ai → Settings → Connectors → Add custom connector → paste the URL. OAuth is discovered automatically.

Any MCP client — claude_desktop_config.json, Cursor, Windsurf, VS Code:

{
  "mcpServers": {
    "corpus-iuris": {
      "url": "https://api.corpusiuris.mx/mcp"
    }
  }
}

Available tool: buscar_derecho_mexicano(query, fuentes).

No registration: the REST API

No API key. No account. Copy and paste:

curl "https://corpusiuris.mx/api/agent/v1/search?q=requisitos+de+la+orden+de+cateo&fuentes=leyes,tesis"

The three routes

Full contract: openapi.json (OpenAPI 3.1).

What makes a response citable

{
  "tipo": "ley",
  "referencia": "Art. 17",
  "titulo": "LEY DE AMPARO, REGLAMENTARIA DE LOS ARTÍCULOS 103 Y 107…",
  "url": "https://corpusiuris.mx/ley/ley-de-amparo…/articulo/17",
  "vigencia": {
    "estado": "VIGENTE",
    "fecha_ultima_reforma": "2025-10-16",
    "verificado_al": "2026-08-17",
    "fuente_oficial": "https://www.diputados.gob.mx/LeyesBiblio/pdf/LAmp.pdf",
    "como_citar": "Di 'vigente al 2026-08-17' y enlaza la fuente oficial."
  }
}

And in case law, the data point that avoids the classic mistake:

"fuerza": {
  "es_jurisprudencia_obligatoria": false,
  "como_citar": "Tesis AISLADA: orientadora, NO obligatoria. No la cites como jurisprudencia."
}

• Laws → vigencia, with the date a night watchman verified the text against the official source. A repealed law comes out with ADVERTENCIA.

• Tesis → fuerza: binding or isolated.

• Precedents → fuerza: they are rulings, not jurisprudence by themselves.

Quotas

The anonymous lane's daily floor never runs out: an IP never stays dead permanently.

IP-verified platforms: OpenAI, Anthropic, Google, Perplexity, Meta. The User-Agent header isn't enough — it's checked against the official feed.

Two rules

1. Cite the source. «Corpus Iuris (corpusiuris.mx)» + the url link of each result you use. Legal texts are public information; the search and curation belong to Corpus Iuris.

2. Don't cache. The corpus changes every day: the watchman scans ~1,000 laws each night, the DOF publishes reforms and the SCJN uploads tesis. Responses are served with Cache-Control: no-store for that reason.

Examples

• ejemplos/curl.sh

• ejemplos/python.py

• ejemplos/node.mjs

In English

Corpus Iuris is a Mexican legal corpus built for AI agents. Free REST endpoint (no key), native MCP server with one-click OAuth, and a public citable page for every document. Every result carries dated validity and, for case law, whether it is binding jurisprudence or a merely persuasive tesis aislada — the distinction that most often trips up AI in Mexican law.

Docs: https://corpusiuris.mx/agentes · OpenAPI: https://corpusiuris.mx/openapi.json

Does not replace the official source

It is a research tool of a referential nature. For a formal filing, verify in the DOF, the Semanario Judicial or the state's official gazette — every result carries the direct link.

Operated by AteraSoft (Mexico) · contacto@corpusiuris.mx