eCFR.io Federal Regulations
Search and read US federal regulations with legal and inline citations linking to ecfr.io.
Connect it
Settings → Connectors → Add custom connector
URL: https://ecfr.io/mcpSettings → Apps & Connectors → Advanced → Developer mode
Create connector with URL: https://ecfr.io/mcp{
"mcpServers": {
"ecfr": {
"url": "https://ecfr.io/mcp"
}
}
}claude mcp add --transport http ecfr https://ecfr.io/mcp{
"servers": {
"ecfr": {
"type": "http",
"url": "https://ecfr.io/mcp"
}
}
}3 tools, verified live
search_regulationsread-onlySearch 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 quoting. For every regulatory claim or quotation, include the returned inlineCitation (Markdown link to ecfr.io), or legalCitation including its ecfr.io URL. Include bodyAsOf/sourceDate where relevant. Fetch the regulation before quoting a
get_regulationread-onlyRetrieve 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 until null for all text. For every regulatory claim or quotation, include the returned inlineCitation (Markdown link to ecfr.io), or legalCitation including its ecfr.io URL. Include bodyAsOf/sourceDate where relevant. Fetch the regulation befo
list_titlesread-onlyList the CFR titles with source dates and canonical ecfr.io URLs. Browse children with get_regulation.
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