Applied AI Research: Verifiable Spanish Case Law Citations

Acervo is an applied research program run by Quorax. We built a multi-agent system in which several specialized AI models share search, reading and verification tools, and connected it to the assistants lawyers already use (Perplexity, Claude and others) through the open MCP standard with OAuth 2.1. It works on case law and legislation published by the official sources (CENDOJ, the Constitutional Court and the consolidated legislation of the BOE). Verification comes first: the system only returns ECLIs that appear literally in the source, flags any citation it cannot verify as not citable, and can also check citations that come from a draft, a third party or another AI. It reads full judgments rather than excerpts, several at a time, and helps draft with them. Each firm works on its own isolated instance hosted in the EU (Frankfurt), under a GDPR Article 28 data processing agreement, with case names, notes and briefs kept inside the firm. The prototype is now being validated with law firms on real assignments through an evaluation access.