Search and read the US Code of Federal Regulations through eCFR.io, with legal citations and inline Markdown citations that include the site link. Read-only, free, no API key.
ecfr-mcp is an MCP project maintained in the lrehmann/ecfr-mcp repository. The maintainer describes its purpose as “Search and read the US Code of Federal Regulations through eCFR.io, with legal citations and inline Markdown citations that include the site link. Read-only, free…”. Read the project documentation for the complete scope.
The maintainer’s configuration uses https://ecfr.io/mcp. Check the project’s account and authentication instructions when adding the endpoint to your client.
Project documentation · Repository · Discovery listing. This profile records the public documentation checked on 2026-10-08.
Check the linked publisher documentation and your connected client's tool list. Names and availability can vary with the server version and account permissions.
| Tool | What it does |
|---|---|
| search_regulations | query, optional limit (1–25, default 10) |
| get_regulation | path, optional offset and length |
| list_titles | none |
{
"mcpServers": {
"ecfr": {
"url": "https://ecfr.io/mcp"
}
}
}From the project documentation. Replace placeholders and example paths before connecting.
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