es-eli-mcp

An MCP server for the Spanish BOE (Boletin Oficial del Estado) open-data API. It grounds Spanish consolidated legislation: given a BOE id or a date in the official gazette, it returns metadata, structure and full consolidated text, with verifiable ELI identifiers and Spanish citations.

Part of the MateMatic eu-legal-mcp production line - after PL, DE and AT. Same citation contract, BOE source.

No free-text search. The BOE open-data keyword-search endpoint (/legislacion-consolidada) currently returns a server-side error, so this connector is grounding + gazette-browse, not keyword search. Discover documents via es_browse_gazette (by date) or use a known BOE id / ELI. Every response carries a dataset_note.

Licence. Spanish BOE content is official public information published as open data; reuse presumes acceptance of the BOE reuse conditions. This connector relays that public content with attribution and a source_url.

The tools

Every response carries the contract: eli_uri (a full ELI URL, e.g. https://www.boe.es/eli/es/lo/2018/12/05/3), human_readable_citation (the official titulo), and source_url.

Related MCP server: Spanish Public Data MCP

Install

cd es-eli-mcp
pip install -e .

Configure (Claude Code / any MCP client)

{
  "mcpServers": {
    "es-eli-mcp": { "command": "es-eli-mcp" }
  }
}

Environment:

• ES_ELI_BASE_URL - default https://www.boe.es/datosabiertos/api

• ES_ELI_CACHE_DIR - default ~/.matematic/cache/es-eli

• ES_ELI_AUDIT_DIR - default ~/.matematic/audit

No API key. BOE open data is keyless.

Governance

• Public data only - read-only against BOE; no client data leaves the machine.

• Audit log - every tool call appends one JSON line to ~/.matematic/audit/es-eli-mcp.jsonl.

• Vendor-neutral - talks only to boe.es; no LLM provider, no telemetry.

• Verifiable citations - every response is independently checkable via source_url.

See CONSTITUTION.md and DISCOVERY.md.

Tests

pip install -e ".[dev]"
pytest tests/test_instructions_drift.py -v   # offline
pytest tests/test_smoke.py -v                # hits live BOE

Licence

Apache-2.0. © Matematic Solutions / Wieslaw Mazur.