Boe Legislacion MCP Server

@pipeworx/boe-legislacion

Spain's consolidated legislation — every Spanish statute and royal decree kept up to date with every amendment folded in, plus the daily table of contents of the state gazette, from the Agencia Estatal Boletín Oficial del Estado (BOE).

Part of Pipeworx — an MCP gateway connecting AI agents to 1800+ live data sources. This is an independent, unofficial integration — not affiliated with, endorsed by, or published by the upstream provider.

Tools

• boe_search_law(query, ambito?, limit?, offset?) — search consolidated legislation by words in the title (e.g. "Código Civil", "ley de propiedad horizontal"). Returns matching laws with their BOE id, legal rank, issuing department, scope (national/regional), key dates, and the official BOE page URL for each. Pass the returned id to boe_law.
• boe_law(id, article?) — one consolidated law by its BOE id. Without article: metadata (rank, department, consolidation status, dates), subject tags, notes, and a table of contents of its articles/sections ("bloques") — capped at 200 entries and marked truncated for large codes. With article (a block id from that table of contents, e.g. "a1" for Artículo 1): the actual text of that one article across every historical version it has had, each dated, with the current one flagged.
• boe_daily_summary(date) — table of contents of one day's BOE issue: every disposition and announcement published that day, grouped by section and issuing department, with each item's BOE id and title. BOE does not publish every day (no Sunday issue, some holidays); those dates come back found: false, never an empty list.

Auth

Keyless. The upstream open-data API requires no registration, key, or click-through terms — it is served to anyone with Accept: application/json.

Data sources

• Agencia Estatal Boletín Oficial del Estado (BOE), Legislación Consolidada — the consolidated-text database of Spanish state and regional legislation, kept current with every amendment.
• Agencia Estatal Boletín Oficial del Estado (BOE), Sumario — the daily table of contents of the state gazette.

Notes

• The Accept header is honoured on 200 only. On any error (400/404/500) the upstream ignores Accept: application/json entirely and always answers a fixed small XML envelope (status code + text, empty data) regardless of what was requested. Every call here reads the body as text first and only parses it as JSON when it looks like JSON, so an error message is never lost to a failed res.json().
• The empty-result shape is not uniform. A zero-match search answers 200 with "data": "" — an empty string, not [] or {} — while a populated list and a single-record lookup are both array-wrapped ("data": [...], even for exactly one record). boe_search_law and boe_law normalise this and report found: false with plain wording on a genuine miss, never an empty array dressed as success.
• Article/section text has no JSON form at all. Only the table of contents (texto/indice) is available as JSON; the actual block text is XML-only. There is no XML parser in the Workers runtime, so boe_law with article extracts paragraphs with targeted regex over BOE's fixed one-block, one-or-more-versions, paragraph-per-version XML shape — reliable for real statute text, not a general-purpose XML parser.
• Large codes are enormous. The Código Civil's table of contents alone is 2,444 blocks. boe_law without article caps what it inlines and reports articles.total / articles.truncated rather than ever returning the whole thing — use article to read one block at a time.
• The upstream does not report a total match count for search — limit / offset paginate, and shown tells you how many came back this call.

Quick Start

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

{
  "mcpServers": {
    "boe-legislacion": {
      "url": "https://gateway.pipeworx.io/boe-legislacion/mcp"
    }
  }
}

What this endpoint actually serves

tools/list at https://gateway.pipeworx.io/boe-legislacion/mcp returns the tools in the table above plus the shared Pipeworx meta-tools — ask_pipeworx, discover_tools, search_within, remember/recall and the rest of the gateway-wide set. So the tool count you see is larger than this table: a single-pack endpoint currently lists roughly 30 shared tools alongside the pack's own. The connection's initialize response states its exact scope, and is the authoritative answer for a given day.

This is deliberate, not multiplexing by accident. The meta-tools are what let a scoped connection answer a question this pack does not cover — via ask_pipeworx, which routes across the whole catalog — without you adding a second MCP server. There is currently no way to mount a pack endpoint without them; if the extra schemas cost you more context than the routing is worth, connect to the full gateway once rather than to several pack endpoints.

Or connect to the full Pipeworx gateway to get every pack's tools listed directly, instead of just this one's:

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

Both URLs reach the same gateway and the same 1800+ data sources. The only difference is which pack's tools are listed directly; ask_pipeworx reaches all of them from either one.

No MCP client? Call it over HTTP

curl -X POST https://gateway.pipeworx.io/v1/tools/boe_search_law \
  -H 'Content-Type: application/json' \
  -d '{"query":"Código Civil","limit":5}'

No account needed for the first calls. Inspect any tool: GET https://gateway.pipeworx.io/v1/tools/boe_search_law. Find one: POST https://gateway.pipeworx.io/v1/tools/search_packs with {"query":"..."}.

Standalone (no gateway account)

This package also runs as a local stdio MCP server — no Pipeworx account, no gateway round-trip:

{
  "mcpServers": {
    "boe-legislacion": {
      "command": "npx",
      "args": ["-y", "@pipeworx/mcp-boe-legislacion"]
    }
  }
}

Or run it directly to confirm it starts:

npx -y @pipeworx/mcp-boe-legislacion

It speaks MCP over stdin/stdout and answers initialize/tools/list/tools/call for only this pack's tools — none of the shared meta-tools the gateway connection above adds. Same source, same tools, no ask_pipeworx routing.

Using with ask_pipeworx

Instead of calling tools directly, you can ask questions in plain English — this works on the pack endpoint above as well as on the full gateway:

ask_pipeworx({ question: "your question about Boe Legislacion data" })

The gateway picks the right tool and fills the arguments automatically.

More

• Docs and guides
• pipeworx.io

License

MIT