US Code of Federal Regulations MCP Server

by mccallar Your server? Claim it

local only

US Code of Federal Regulations runs on your own machine — the client starts it, so there is no endpoint to ping. 153 installs a week from pypi. Last commit 29 Aug 2026.

Look up, search, and track changes to the US Code of Federal Regulations (eCFR).

Installs per day peak 43 · avg 22 · -4% w/w

a month agotoday

153

Installs / week

pypi · cfr-mcp

Stars

0 open issues

29 Aug 2026

Last commit

from GitHub

MIT

License

Python

What the code does

We read the source, 1 d ago · rules ccca72095570

Evidence

Things with no honest explanation: a promise that contradicts the code, code that runs at install time while hiding what it does, data leaving the machine.

Name looks like a popular package ecfr-mcp

cfr-mcp похож на ecfr-mcp

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

We found things in this code

Code changes quietly between releases, and nobody reads the diff of a dependency. We do, on every release — watch US Code of Federal Regulations and you get told the day something new turns up.

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add cfr-mcp -- uvx cfr-mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "cfr-mcp": {
      "args": [
        "cfr-mcp"
      ],
      "command": "uvx"
    }
  }
}

~/.codex/config.toml

[mcp_servers.cfr-mcp]
command = "uvx"
args = ["cfr-mcp"]

.cursor/mcp.json

{
  "mcpServers": {
    "cfr-mcp": {
      "args": [
        "cfr-mcp"
      ],
      "command": "uvx"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "cfr-mcp": {
      "args": [
        "cfr-mcp"
      ],
      "command": "uvx"
    }
  }
}

Alternatives to US Code of Federal Regulations

same job, measured the same way

US Code Federal Statutes

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eCFR

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eCFR

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Us Code

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US Code of Federal Regulations — questions

Answers built from our own checks of this server.

Why is there no uptime for US Code of Federal Regulations?

US Code of Federal Regulations runs on your own machine over stdio — there is no network address to reach, so uptime cannot be measured for it by anyone. What can be measured is adoption: the pypi package cfr-mcp was installed 153 times last week.

How do I connect US Code of Federal Regulations?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It runs locally, so the command pulls cfr-mcp straight from pypi; nothing to host, nothing to sign up for.

How many people use US Code of Federal Regulations?

The pypi package cfr-mcp was installed 153 times in the last week. Week over week that is -4%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.

Is US Code of Federal Regulations open source?

Yes — it is published under the MIT licence, written in Python and 1 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.