Dol M1 MCP server

@pipeworx/dol-m1 — Form M-1 (MEWA/AHP) filings

U.S. Department of Labor Form M-1 filings — the federal report filed by multiple employer welfare arrangements (MEWAs) and association health plans (AHPs) that pool health coverage across unrelated employers. form5500 already covers annual plan/pension financial returns, and ebsa covers EBSA's own civil-penalty enforcement record against deficient Form 5500 filers — this is a third, unrelated filer population and form.

Part of Pipeworx — an MCP gateway connecting AI agents to 1878+ live data sources. This is an independent, unofficial integration — not affiliated with, endorsed by, or published by the upstream provider.

Tools

Auth

Keyless. No login, no API key, no approval step.

Data sources

M-1 Filings Database. 17,313 filings live as of 2026-10-18, plan years 2003-2025.

• U.S. Department of Labor, Employee Benefits Security Administration — Form

Gotchas

published REST API — the endpoint shape came from the search page's own bundled JavaScript (m1search.build_url), not from any API docs. It is still a plain, publicly reachable GET with no auth; nothing here needs a browser or a session.

• Reverse-engineered, not documented. This is a public search tool, not a

field does. Plan year and filing type default to "ALL", and the stop-loss/fully-insured flags default to "0" ("Any") in the real form. Sending "" for any of those four throws an unhandled server exception — the endpoint answers HTTP 500 with a full HTML error page**, not a structured error. This pack always sends the correct default.

• **The dropdown filters do not accept an empty string the way a free-text

aliases. hqstate filters where the MEWA is based; coveragestate filters where it offers coverage — a MEWA headquartered in New Jersey can show up filtered by coveragestate: "NY" with hq_state: "NJ" on its own row. Verified live.

• **Headquarters state and coverage state are different facets, not

past that — it silently resets to a 25-row default.** Measured live: limit=100 returns 100 rows, limit=101 returns 25. This pack clamps its own limit argument to 1-100 before calling, so a caller's limit: 500 cannot trigger the silent fallback.

• **limit has an undocumented cap of 100, and it does not clamp or error

not an error. This pack turns that into { found: false, reason: "nomatchingfilings", filters_applied: {...} } rather than passing through a bare [].

• A zero-match query is a clean HTTP 200 with {"total":0,"rows":[]} —

the filingtype request filter — every row observed across every filing-type query (Amended, Extension, Regular Filing, Registration) came back FilingType: 0. The request-side filter itself works (verified live: filtering narrows the total count correctly per type); only the echoed field is unreliable, so it is left out of the shaped output.

• **The FilingType field on each returned row does not reliably reflect

For small MEWAs the Form M-1 administrator of record is sometimes a natural person's own name — this is the DOL's own mandatory public-filing field, passed through exactly as the federal filing discloses it, the same way form5500 and ebsa already pass through their own sponsor fields.

• The administrator/sponsor name can be an individual, not a business.

Quick Start

Add to your MCP client (Claude Desktop, Cursor, Windsurf, etc.):

{
  "mcpServers": {
    "dol-m1": {
      "url": "https://gateway.pipeworx.io/dol-m1/mcp"
    }
  }
}

What this endpoint actually serves

Shortened. The full README is on GitHub.