`search_regulations`

Pack: ecfr · Endpoint: https://gateway.pipeworx.io/ecfr/mcp

Full-text search across all 50 titles of the US Code of Federal Regulations (federal agency regulations) via the official eCFR API. Returns matching sections with citation, heading, and excerpt. e.g. “drone operation”, “food labeling”, “overtime pay”. Optionally restrict to one CFR title number. Keyless.

Parameters

Name	Type	Required	Description
`query`	string	yes	Search phrase, e.g. “drone operation”, “food labeling”, “overtime pay”, “hazardous waste”.
`title`	number	no	Optional CFR title number (1–50) to restrict the search to. Use list_titles to see the title index, e.g. 14 = Aeronautics and Space, 21 = Food and Drugs, 29 = Labor.
`limit`	number	no	Max results to return (default 10, max 20).
`page`	number	no	Page number for pagination (default 1).

Example call

Arguments

{
  "query": "drone operation"
}

curl

curl -X POST https://gateway.pipeworx.io/ecfr/mcp \
  -H 'Content-Type: application/json' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"search_regulations","arguments":{"query":"drone operation"}}}'

TypeScript (@pipeworx/sdk)

import { Pipeworx } from '@pipeworx/sdk';
const pipeworx = new Pipeworx();

const result = await pipeworx.call('search_regulations', {
  "query": "drone operation"
});

More examples

{
  "query": "food labeling",
  "title": 21,
  "limit": 15
}

Connect

Add this to your MCP client config, or use one-click install buttons:

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

See Getting Started for client-specific install steps.

search_regulations