# eCFR (MCP server)

> eCFR is an MCP server that adds developer tools to AI assistants such as Claude Desktop, Claude Code and Cursor. Electronic Code of Federal Regulations including FAR, DFARS, and agency supplements. It has 27 GitHub stars, is released under the MIT license and runs locally with uvx ecfr-mcp.

Free, open-source MCP server for the eCFR (Electronic Code of Federal Regulations) API. Read FAR, DFARS, and all agency FAR supplement text with no authentication required.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/1102tools-dev/federal-contracting-mcps |
| GitHub stars | 27 |
| License | MIT |
| Language | Python |
| Transport | stdio, streamable-http |
| Packages | pypi: ecfr-mcp |
| Remote URL | https://ecfr.1102tools.com/mcp |
| Needs API key | no |
| Official | yes |
| Works with | Claude Desktop, Claude Code, Cursor, VS Code, Claude.ai, ChatGPT |
| Category | Developer tools |
| Latest release | v1.0.34 (Oct 21, 2026) |
| Last commit | Oct 25, 2026 |
| MCP registry name | com.1102tools/ecfr-mcp |

## Install

### Claude Desktop (claude_desktop_config.json)

```json
{
  "mcpServers": {
    "ecfr": {
      "command": "uvx",
      "args": [
        "ecfr-mcp"
      ]
    }
  }
}
```

Settings > Developer > Edit Config. macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\. Restart Claude Desktop afterwards.

### Claude Code

```sh
claude mcp add --transport stdio ecfr -- uvx ecfr-mcp
```

### Cursor (.cursor/mcp.json)

```json
{
  "mcpServers": {
    "ecfr": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "ecfr-mcp"
      ]
    }
  }
}
```

Project file; use ~/.cursor/mcp.json to enable it in every project.

### VS Code (.vscode/mcp.json)

```json
{
  "servers": {
    "ecfr": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "ecfr-mcp"
      ]
    }
  }
}
```

### Claude Code (remote)

```sh
claude mcp add --transport http ecfr "https://ecfr.1102tools.com/mcp"
```

The same server is also hosted as a remote MCP endpoint, so nothing runs on your machine.

Config formats checked against the official docs on 2026-10-07.

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