`fda_warning_letters`

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

Search FDA WARNING LETTERS — official enforcement letters FDA sends firms for violations (CGMP, adulterated/misbranded products, unapproved claims). Answers “has received an FDA warning letter”, “recent FDA warning letters about supplements/devices”. By default search matches the RECIPIENT company the letter was issued to, so the answer is about that firm’s own enforcement history; set match:“fulltext” to search the whole letter record instead, which also finds letters that merely mention a firm. Every row reports matched_field so a caller can tell “issued to” from “mentions”. Covers ~3,660 letters. Returns recipient company, posted/issued dates, issuing FDA office, subject, and a link to the full letter text. Keyless, live from fda.gov.

Parameters

Name	Type	Required	Description
`search`	string	no	Company the letter was issued to (e.g. “Elanco”, “Merck Sharp & Dohme”) under the default match mode. Under match:“fulltext” this is a free-text query over the whole record — a product (“supplement”) or violation topic (“CGMP”). Omit for the most recent letters.
`match`	string	no	How `search` is applied. “recipient” (default) keeps only letters whose addressed company matches. “fulltext” returns every record matching anywhere in its indexed text, including letters that only mention the term.
`limit`	number	no	Max letters to return, 1–50 (default 10). Newest first.

Example call

Arguments

{
  "search": "Elanco"
}

curl

curl -X POST https://gateway.pipeworx.io/openfda/mcp \
  -H 'Content-Type: application/json' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"fda_warning_letters","arguments":{"search":"Elanco"}}}'

TypeScript (@pipeworx/sdk)

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

const result = await pipeworx.call('fda_warning_letters', {
  "search": "Elanco"
});

More examples

{
  "search": "supplement",
  "limit": 20,
  "match": "fulltext"
}

Connect

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

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

See Getting Started for client-specific install steps.

fda_warning_letters