# United States Legal Research MCP Server (`us-legal-mcp`)

Model Context Protocol (MCP) server providing direct, read-only access to **United States (US)** legislation, multi-tier judicial decisions (First Instance, Regional/Cantonal/Appellate, and Supreme/Constitutional courts), and statutory citation verification for Claude Desktop, Cursor, and Antigravity.

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## Quick Desktop Setup (No Command Line Required)

This package includes a graphical installer for legal practitioners who prefer not to use terminal commands or edit JSON configuration files manually.

1. **Download:** Click **`<> Code`** at the top right of this repository, select **`Download ZIP`**, and extract the folder to your computer.
2. **Run the Setup Utility:**
   - **Windows:** Double-click `Click_Here_To_Install_Windows.bat`
   - **macOS:** Double-click `Click_Here_To_Install_Mac.command`
3. **Connect:** Click **Install & Connect Automatically** in the setup window and restart Claude Desktop.

**System Integrity Note:** The setup utility operates strictly in read-only mode with respect to your personal files and documents. It installs an isolated Python environment inside the extracted folder and registers the server entry in your AI client configuration.

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## Multi-Tier Judicial Hierarchy & Official Sources

This server indexes and queries decisions across the full judicial hierarchy of **United States**, allowing practitioners to filter research by procedural stage:

| Judicial Tier | Covered Courts & Tribunals |
|:---|:---|
| **Tier 1 — First Instance** | 94 U.S. Federal District Courts, U.S. Bankruptcy Courts, U.S. Court of International Trade & State Trial/Superior Courts |
| **Tier 2 — Regional / Cantonal / Appellate** | 13 U.S. Circuit Courts of Appeals (1st–11th, D.C., Federal Circuit) & 50 State Intermediate Appellate Courts |
| **Tier 3 — Supreme & Constitutional** | Supreme Court of the United States (SCOTUS) & 50 State Supreme Courts / Courts of Last Resort |

### Primary Legal Portals

- **National Legislation Registry:** Electronic Code of Federal Regulations (eCFR API) & US Code (`https://www.ecfr.gov/api/search/v1/results`)
- **Multi-Tier Case Law Database:** CourtListener / Free Law Project Multi-Tier Federal & State Database (courtlistener.com) (`https://www.courtlistener.com/api/rest/v4/search/`)
- **Supported Citation Format Example:** `410 U.S. 113 or 21 C.F.R. § 314.50`

### Indexed Court & Regional Sub-Portals

| Sub-Portal Identifier (`sub_court`) | Official Endpoint / Registry |
|:---|:---|
| `scotus` | `https://www.courtlistener.com/?court=scotus` |
| `federal_circuits` | `https://www.courtlistener.com/?court=ca1+ca2+ca3+ca4+ca5+ca6+ca7+ca8+ca9+ca10+ca11+cadc+cafc` |
| `federal_districts` | `https://www.courtlistener.com/` |

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## Available MCP Tools

| Tool | Description |
|:---|:---|
| `search_legislation` | Searches enacted statutes, codes, decrees, and official gazette publications in United States. |
| `search_case_law` | Searches national jurisprudence and European/ECLI-linked judgments for United States. |
| `search_tiered_court_decisions` | Filters case law specifically by judicial instance (`first_instance`, `appellate_regional`, `supreme_constitutional`) or regional/cantonal court key (`sub_court`). |
| `list_court_hierarchy` | Returns the complete 3-tier court structure and registered sub-portal endpoints for United States. |
| `get_legal_document_markdown` | Retrieves full statutory or judicial texts and converts them into clean Markdown. |
| `verify_citation` | Validates statutory and case law citations against official registries. |

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<details>
<summary><b>Manual Configuration for Developers (Optional)</b></summary>

```json
{
  "mcpServers": {
    "us-legal-mcp": {
      "command": "uvx",
      "args": [
        "--from",
        "git+https://github.com/jurisatlas/us-legal-mcp",
        "us-legal-mcp"
      ]
    }
  }
}
```
</details>