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US Code of Federal Regulations

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

Connector by mccallar · GitHub account verified by the MCP Registry

IndexedMITLocal (stdio)★ 1
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Install

Works with Claude Code, Codex, VS Code, Cursor, Windsurf, Claude Desktop. Read the repository before you give any tool access to your data.

npx agentmarket install connector/mccallar-cfr-mcp

Asks which of your tools to add it to (Claude Code, Codex, Cursor, VS Code, Windsurf, Gemini CLI, Claude Desktop) and shows the change first. See https://agentmart.dev/cli.

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About

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

Reviews

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Permissions

What this server can do and what it asks for, from its tool list and install config. Checked Oct 25, 2026.

Tools
7 read · 0 write · 0 deleteRead-only
Secrets
None asked for
Install scripts
Not scanned yet
Runs as
Python package

Tools by what they do 7

Read from the source code; the running server may list different tools.

Read 7 · Look things up without changing anything.

  • browse_structure
  • compare_versions
  • list_agencies
  • lookup_citation
  • search_regulations
  • what_changed
  • where_does_term_appear

Tools (7)

Read from the source code; the running server may differ. Descriptions are the server’s own words; hidden characters are shown as [U+…].

  • browse_structure

    Return the CFR hierarchy for a title (or one part) without any text.

  • compare_versions

    Show how a citation's text differs between two dates, as a diff. Use what_changed first to find amendment dates worth comparing; pass the day before an amendment as date_a and the amendment date as date_b to see exactly what that rule changed. Both dates must be 2017-01-03 or later.

  • list_agencies

    List federal agencies and the CFR titles/chapters they administer. Use this to turn a name like "EPA" into the right CFR title before searching.

  • lookup_citation

    Retrieve the text of a specific CFR citation. Large parts return an outline of their sections instead of full text; follow up with a specific section citation to read it.

  • search_regulations

    Full-text search across the CFR. Returns citations, headings and short snippets only — never full text. Follow up with lookup_citation to read anything.

  • what_changed

    List amendment dates for a citation, plus any published corrections. Each amendment is cross-linked to the Federal Register rule that caused it, with a URL to the rulemaking (whose preamble explains the why). Follow up with compare_versions to see exactly what text changed.

  • where_does_term_appear

    Show which titles/chapters/parts contain a term, with hit counts. Cheap orientation tool: fetches no regulation text at all. Use this before searching when you don't know which part of the CFR governs a topic.

Signals

Stars
1
Forks
0
Open issues
0
Weekly downloads
39
Last commit
Aug 29, 2026 (2 months ago)
Last release
Aug 29, 2026 (2 months ago)
Last package publish
Aug 29, 2026 (2 months ago)

From GitHub (fetched Oct 24, 2026) and the package registry.

Details

Registry name
io.github.mccallar/cfr-mcp
Version
0.2.2
Auth
No auth
Packages
pypi cfr-mcp
License
MIT
Repository
github.com/mccallar/cfr-mcp
First seen
Oct 24, 2026
Last checked
Oct 24, 2026
Source
Official MCP Registrygithub-graphql
Cite this page

US Code of Federal Regulations MCP server. Agent Mart. https://agentmart.dev/connectors/mccallar-cfr-mcp (last updated 2026-10-24)