io.ecfr/ecfr

up checked 2026-11-11T01:38:46.588Z

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Publisher-provided title

eCFR.io Federal Regulations

Publisher-provided description

Search and read US federal regulations with legal and inline citations linking to ecfr.io.

Summary by lookupd

Lets an agent search, browse, and read US federal regulation text by title, section, or citation, with links to source pages.

Install

Claude Code, remote (streamable-http)

claude mcp add --transport http ecfr https://ecfr.io/mcp

Codex, remote (streamable-http)

codex mcp add ecfr --url https://ecfr.io/mcp

Cursor, remote (streamable-http) → .cursor/mcp.json

{
  "mcpServers": {
    "ecfr": {
      "url": "https://ecfr.io/mcp"
    }
  }
}

Other clients: docs. Or tell your agent: Set up lookupd for me: read https://lookupd.com/agent.md and follow it.

Publisher-provided text

search_regulations Search current US CFR text or a citation such as 31 CFR 10.1. Returns snippets and legal/inline citations with ecfr.io links. Fetch matching regulations before
get_regulation Retrieve regulation text and child links by canonical path returned by search, e.g. /Title-31/Section-10.1. Inspect dates and stale flags. Follow nextOffset unt
list_titles List the CFR titles with source dates and canonical ecfr.io URLs. Browse children with get_regulation.

Shows this live status and links here; updates hourly.

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