Free Legal Research Just Got Real: How to Connect CourtListener to Claude

The Free Law Project just launched a free MCP (Model Context Protocol) integration connecting Claude directly to CourtListener — a database of millions of federal and state court decisions, PACER data, oral argument recordings, and judicial financial disclosures. Every CourtListener account is free. The MCP integration is free. The practical result: a solo attorney can now type a legal research question into Claude and get case citations from primary source material without paying Westlaw or LexisNexis.

This guide covers what the integration includes, how to connect it in 15 minutes, and an honest comparison with paid legal research tools so you know when the free stack is sufficient and when it isn't.

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What CourtListener Is (and What the MCP Does)

CourtListener is the Free Law Project's flagship database. It has been building open-access legal data infrastructure since 2010. Today it covers:

• All federal circuit and district court decisions
• State supreme and appellate court decisions across all 50 states
• PACER federal docket information (without the per-page PACER fees)
• Oral argument recordings from federal appellate courts
• Judicial financial disclosures

The database is comprehensive enough that a solo attorney practicing federal law or state appellate work can get genuine research value from it without supplemental subscriptions.

MCP — the Model Context Protocol — is Anthropic's standard for connecting Claude to external data sources in real time. In plain language: it's a structured way for Claude to directly query a database during a conversation rather than relying on its training data. Before MCP integrations, if you wanted Claude to analyze a specific case, you had to find the case yourself, copy the text, and paste it in. With the CourtListener MCP, Claude goes and gets it.

The practical result: you stay in Claude. You ask a research question. Claude queries CourtListener, returns relevant decisions with citations, and then you work through the analysis together — all in one interface.

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What You Get for Free

The free stack covers more than most solo and small firm attorneys realize:

Federal coverage: All 13 circuit courts, the U.S. Supreme Court, and district court decisions. If you practice in federal court, CourtListener's federal coverage is comprehensive.

State coverage: Supreme court and major appellate court decisions in all 50 states. If your work involves state appellate law — contract disputes, family law appeals, business litigation — coverage is solid.

PACER data: Federal docket information without the $0.10/page PACER fees. This matters for any attorney who regularly checks federal docket activity.

Oral arguments: Recordings and transcripts from federal appellate courts. Useful for practitioners who want to understand how a panel is thinking about a case category.

How this compares to a basic Westlaw subscription: A basic Westlaw subscription for a solo attorney typically runs $150–$300/month and provides primary source access (case law) plus editorial annotation. CourtListener MCP covers the primary source access at $0. The gap is the editorial annotation — headnotes, practice guides, KeyCite validity signals — which Westlaw and LexisNexis provide and CourtListener does not.

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Setup: How to Connect CourtListener to Claude

The full setup takes 10–15 minutes.

Step 1: Create a free CourtListener account

Go to courtlistener.com and create a free account. No payment information required. Once your account is created, navigate to your account settings and generate an API token. Copy that token — you'll need it in the next step.

Step 2: Add the MCP server in Claude

In Claude for Work (or Claude Pro), navigate to Settings → Integrations (or the MCP/Tools section). Add a new MCP server connection. You'll provide the CourtListener MCP server endpoint and your API token credentials. Claude's interface walks you through this — it's a form-fill, not a technical configuration.

If you're using Claude through a firm's Claude for Work deployment, check with whoever manages the account about whether they've enabled MCP integrations. Some enterprise deployments restrict third-party MCP connections.

Step 3: Test the connection

Once connected, test with a specific research query. Good test prompts:

• "Find cases in the 9th Circuit on piercing the corporate veil for LLCs, last five years"
• "What's the current standard in the 7th Circuit for preliminary injunctions in employment non-compete cases?"
• "Find Illinois appellate decisions on landlord duty to disclose defects, 2020–2025"

If Claude returns specific case citations with case names and dates, the connection is working.

What works well vs. what doesn't:

The integration performs best for case law lookup and precedent search by jurisdiction and case type. It works less well for complex multi-document synthesis (comparing dozens of cases across multiple jurisdictions), and it does not provide citation validity signals (whether a case has been overruled or distinguished). For those tasks, see the next section.

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Where CourtListener MCP Ends and CoCounsel Begins

This is the honest comparison that matters for a practicing attorney.

CourtListener MCP is sufficient for:

• Preliminary research to understand the landscape on a question
• Identifying relevant cases for a research memo
• Checking what recent decisions exist in a circuit on a specific issue
• Routine research for matters where citation validity isn't critical (initial client counseling, internal analysis, small-matter advice)

CoCounsel (or Westlaw/LexisNexis) is worth the cost when:

• You're citing cases in formal court submissions. KeyCite (Westlaw) and Shepard's (LexisNexis) tell you whether the case you're about to cite has been overruled, distinguished, or called into question. That validity check is not optional when you're filing with a court.
• You need editorial annotation. Westlaw's headnotes and practice guides organize case law in ways that raw decision text doesn't. For complex research in an unfamiliar area, that editorial structure saves time.
• You're working with materials beyond case law. Westlaw and LexisNexis include statutes, regulations, law review articles, and practice guides. CourtListener is case law and docket data.

The ROI math for a solo attorney: if you're currently spending 10 hours a month doing legal research at $50–$200/hour in Westlaw fees (or spending time doing research that Westlaw could accelerate), CourtListener MCP plus Claude handles the portion of that research that doesn't require citation validity or editorial annotation. For many solo practitioners, that's a significant portion of routine research work.

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What This Actually Replaces (and What It Doesn't)

Replaces:

• Manual PACER docket searches with per-page fees
• General web legal research (Google Scholar, case law sites with clunky interfaces)
• The "find relevant cases in this circuit" step that used to require opening a paid research platform

Doesn't replace:

• Westlaw or LexisNexis for high-stakes formal filings where citation validity matters
• Harvey AI or CoCounsel for large-scale document review across firm-wide matters
• Specialized legal research services with editorial curation and annotated practice guides
• Your own judgment about which cases are actually relevant and how they apply to your specific facts

The way to think about it: CourtListener MCP plus Claude is an excellent research associate. It can find, retrieve, and help you analyze primary source material. It cannot exercise attorney judgment, and it cannot guarantee that the cases it returns are still good law. Those remain your responsibility.

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One Caveat Worth Stating Plainly

The MCP integration launched in May 2026. It's new, which means setup instructions may evolve as the Free Law Project and Anthropic update their respective platforms. If the specific steps above don't match what you see in Claude's settings, check the Free Law Project's documentation at courtlistener.com for current setup guidance.

That said, the core of the value proposition is stable: this is a free, high-quality primary source legal database with a working AI integration. For a solo or small firm attorney, it's worth the 15 minutes to set up.

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FAQ: CourtListener MCP for Small Law Firms

Is CourtListener MCP really free?

Yes. Both CourtListener and the MCP integration are free. CourtListener is a Free Law Project nonprofit that has operated since 2010. The MCP integration launched in May 2026. You need a Claude subscription (Pro at $20/month, or Claude for Work) and a free CourtListener account — no additional fees.

What legal databases can Claude access through CourtListener MCP?

Federal circuit and district court decisions, U.S. Supreme Court decisions, state supreme and appellate court decisions across all 50 states, PACER federal docket data, oral argument recordings, and judicial financial disclosures. Continuously updated as new decisions are published.

How does CourtListener MCP compare to CoCounsel or Westlaw?

CourtListener covers primary source materials at no cost. CoCounsel and Westlaw add KeyCite/Shepard's citation validity signals, editorial annotation, and practice guides. Use CourtListener MCP for preliminary research and analysis; use a paid service to verify citation validity before filing with a court.

Can I use CourtListener MCP to research cases in my state?

Yes, for state supreme and appellate courts in all 50 states. Lower trial court coverage varies. For federal law or state appellate research, coverage is comprehensive. For lower state court decisions, supplement with your state's free court records portal.

How do I set up CourtListener MCP with Claude?

Create a free account at courtlistener.com, generate an API token from your account settings, and add the MCP server connection in Claude's Settings → Integrations. Full setup takes 10–15 minutes. Test with a specific case lookup query to confirm the connection is working.