🇺🇸 US Legal MCP Server

Comprehensive US legal data in your AI workflow. Search Congress bills, Federal Register documents, court opinions, and committees. No API keys required (optional for enhanced access).

An MCP (Model Context Protocol) server that brings authoritative US legal information into AI coding environments like Cursor and Claude Desktop.

Why Use US Legal MCP?

• 🆓 No API Keys Required – Works out of the box (optional keys for enhanced access)
• 📜 Comprehensive Sources – Congress, Federal Register, CourtListener
• ⚡ Easy Setup – One-click install in Cursor or simple manual setup
• 🔍 Multi-Source Search – Search across all legal sources simultaneously
• 📊 Real-time Data – Recent bills, regulations, and court opinions

Quick Start

Ready to explore US legal data? Install in seconds:

Install in Cursor (Recommended):

🔗 Install in Cursor

Or install manually:

npm install -g us-legal-mcp
# Or from source:
git clone https://github.com/JamesANZ/legal-mcp.git
cd legal-mcp && npm install && npm run build

Features

📜 Congress.gov

• search-congress-bills – Search bills and resolutions
• get-recent-bills – Get recently introduced legislation
• get-congress-committees – List Congressional committees

📋 Federal Register

• search-federal-register – Search regulations and executive orders
• get-recent-regulations – Get recently published documents

⚖️ CourtListener

• search-court-opinions – Search court opinions (federal and state)
• get-recent-court-opinions – Get recent court decisions

🔍 Multi-Source

• search-all-legal – Comprehensive search across all sources

Installation

Cursor (One-Click)

Click the install link above or use:

cursor://anysphere.cursor-deeplink/mcp/install?name=legal-mcp&config=eyJsZWdhbC1tY3AiOnsiY29tbWFuZCI6Im5weCIsImFyZ3MiOlsiLXkiLCJ1cy1sZWdhbC1tY3AiXX19

Manual Installation

Requirements: Node.js 18+ and npm

# Clone and build
git clone https://github.com/JamesANZ/legal-mcp.git
cd legal-mcp
npm install
npm run build

# Run server
npm start

Claude Desktop

Add to claude_desktop_config.json:

macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
Windows: %APPDATA%\Claude\claude_desktop_config.json

{
  "mcpServers": {
    "us-legal-mcp": {
      "command": "node",
      "args": ["/absolute/path/to/legal-mcp/dist/index.js"],
      "env": {
        "CONGRESS_API_KEY": "",
        "COURT_LISTENER_API_KEY": ""
      }
    }
  }
}

Restart Claude Desktop after configuration.

Usage Examples

Search Congress Bills

Find bills related to a specific topic:

{
  "tool": "search-congress-bills",
  "arguments": {
    "query": "immigration",
    "congress": 118,
    "limit": 10
  }
}

Search Federal Regulations

Find regulations on a topic:

{
  "tool": "search-federal-register",
  "arguments": {
    "query": "environmental protection",
    "limit": 5
  }
}

Comprehensive Legal Search

Search across all sources simultaneously:

{
  "tool": "search-all-legal",
  "arguments": {
    "query": "healthcare",
    "limit": 20
  }
}

Search Court Opinions

Find court decisions:

{
  "tool": "search-court-opinions",
  "arguments": {
    "query": "immigration asylum",
    "court": "scotus",
    "limit": 10
  }
}

Data Sources

Source	Description	API	Auth Required
Congress.gov	Bills, resolutions, committees	https://api.congress.gov/v3	Optional
Federal Register	Regulations, executive orders	https://www.federalregister.gov/api/v1	No
CourtListener	Court opinions, decisions	https://www.courtlistener.com/api/	Optional

API Keys (Optional)

Congress.gov API Key

1. Visit https://api.congress.gov/
2. Sign up for a free account
3. Get your API key
4. Set CONGRESS_API_KEY environment variable

CourtListener API Key

1. Visit https://www.courtlistener.com/api/
2. Create a free account
3. Get your API key from your profile
4. Set COURT_LISTENER_API_KEY environment variable

Use Cases

• Legal Researchers – Quick access to bills, regulations, and court opinions
• Policy Analysts – Track legislation and regulatory changes
• Lawyers – Reference tool for case law and regulations
• Developers – Build apps with authoritative legal data

Technical Details

Built with: Node.js, TypeScript, MCP SDK
Dependencies: @modelcontextprotocol/sdk, superagent, zod
Platforms: macOS, Windows, Linux

Contributing

⭐ If this project helps you, please star it on GitHub! ⭐

Contributions welcome! Please open an issue or submit a pull request.

License

MIT License – see LICENSE file for details.

Support

If you find this project useful, consider supporting it:

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