legalcite-mcp

MCP server that verifies legal case citations against real court records (CourtListener) and flags hallucinated/fake or misattributed cites — so AI agents stop citing cases that don't exist.

Tool

verify_citations(text: string)

Pass any text containing legal citations (a paragraph, a brief, an AI-drafted answer). Detects every case citation (e.g. 410 U.S. 113) and checks each against real court records. Returns, per citation:

• real — the case exists and (if a name was given) matches.
• not-found — no such case; likely hallucinated. Don't rely on it.
• mismatch — the citation is real, but the case name in the text is wrong.

Always run this before relying on or filing an AI-generated legal citation.

Verifies citation existence/metadata only — not legal correctness or good-law status. Not legal advice.

Install

{
  "mcpServers": {
    "legalcite": {
      "command": "npx",
      "args": ["-y", "legalcite-mcp"],
      "env": { "LEGALCITE_API_KEY": "lk_… (optional, Pro tier)" }
    }
  }
}

Or run from source: node mcp/server.js. Set LEGALCITE_BASE to target a specific deployment (default https://legalcite-one.vercel.app).

Pricing

Free: 20 checks/day (no key). Pro: 2,000/day with an API key — see https://legalcite-one.vercel.app/pricing.html

Data from CourtListener (Free Law Project).