LawDiver MCP

Caselaw your AI can actually cite

The LawDiver MCP server puts 10M+ verified U.S. opinions inside your AI assistant. It searches, reads, and cite-checks against the real corpus — so the authority in the answer is authority that exists.

Create a free account

LawDiver already on Claude — click here to start using LawDiver on Claude

Why connect a caselaw database at all?

A general-purpose model asked for a citation will produce something that looks like one. Courts have sanctioned lawyers over exactly that. An MCP connection changes where the authority comes from: instead of recalling a case, the assistant queries a database of real opinions and quotes what it finds — and you can follow every cite back to the full text.

What your assistant can do

Three tools, the same ones the REST API exposes, called by the model as it works.

Search cases

Semantic, keyword, boolean, and citation search across federal and state opinions, scoped by jurisdiction and court. The assistant gets the passage that made each case relevant, not just a title.

Retrieve an opinion

Pull the full text and structured metadata — court, dates, holdings, citations — so the model reasons over the actual decision instead of a summary of it.

Check a citation

Confirm a case citation exists and report treatment, or verify specialty forms (Rev. Rul., SEC releases) against held corpora. Specialty hits return authorityCoverage instead of a case candidate.

Stay inside your jurisdiction

Scope a session to one state, one circuit, or the U.S. Supreme Court, and the assistant cannot wander into authority that does not bind your court.

How it works

1. 1

   Create a free account

   Sign up with email and a password. You get an API key for editors and CLIs; Claude.ai uses OAuth Connect with the same account.
2. 2

   Add the server to your client

   Pick your agent on this page for exact steps. Endpoint: https://lawdiver.com/mcp — API key header or OAuth, no local install.
3. 3

   Ask a legal question

   The assistant decides when to search, read, or cite-check. You see which tool it called and what came back — the research is auditable, not a black box.
4. 4

   Follow the authority

   Every result carries the case name, citation, court, and date, and links to the full opinion on LawDiver so you can verify before you rely on it.

Which agent are you using?

Choose your agent for the best setup instructions.

• OpenClaw
• Hermes Agent
• Claude.ai
• ChatGPT
• Claude Code
• Codex
• Grok Bot
• OpenCode
• Cursor
• Other

Prefer to call it yourself?

The MCP tools wrap the LawDiver API. The developer reference covers authentication, every endpoint and field, error codes, idempotency, and runnable examples.