Published on PyPI + MCP Registry (io.github.matematicsolutions/es-eli-mcp). Run without cloning:

uvx es-eli-mcp

Configure your MCP client (stdio):

{ "mcpServers": { "es-eli-mcp": { "command": "uvx", "args": ["es-eli-mcp"] } } }

Smart App Control blocks unsigned executables, which covers uvx.exe, pip.exe and the es-eli-mcp.exe launcher that pip writes at install time. The python.exe and py.exe from the python.org installer are signed by the Python Software Foundation, so running the module through the interpreter works:

python -m pip install es-eli-mcp
python -m es_eli_mcp

pip.exe is blocked for the same reason, so install with python -m pip, not pip install. If python is not on PATH, use the Windows launcher: py -3 -m es_eli_mcp.

{ "mcpServers": { "es-eli-mcp": { "command": "python", "args": ["-m", "es_eli_mcp"] } } }

Do not turn Smart App Control off to work around this - it cannot be re-enabled without reinstalling Windows.

Building from source: see Install.

An MCP server for five Spanish open-data sources:

1. BOE (Boletin Oficial del Estado) open-data API - consolidated legislation. Given a BOE id or a date in the official gazette, returns metadata, structure and full consolidated text, with verifiable ELI identifiers and Spanish citations.
2. Tribunal Constitucional (Sistema HJ / hj.tribunalconstitucional.es) - Spain's Constitutional Court case law (Sentencias / Autos / Declaraciones). Given an internal resolution id, or a citation number+year (e.g. "STC 31/2010"), returns the full ruling with ECLI and a Spanish doctrinal citation.
3. DGT (Direccion General de Tributos, petete.tributos.hacienda.gob.es) - binding tax rulings: ~69,500 consultas vinculantes + ~19,700 consultas generales (live-counted 2026-07-08). Full-text/date search plus the full ruling text by NUM-CONSULTA (e.g. "V0001-25").
4. TEAC (Tribunales Economico-Administrativos, DYCTEA) - ~6,500 doctrine criterios with the full resolution text inline, searched by RG claim-number segments and/or date range.
5. AEPD (Agencia Espanola de Proteccion de Datos) - ~46,800 data-protection resolutions with Solr full-text search and a verified PDF permalink per expediente (e.g. "PS-00615-2025").

Part of the MateMatic eu-legal-mcp production line - after PL, DE and AT. Same citation contract pattern, five Spanish sources.

Free-text search exists on DGT and AEPD only. The BOE open-data keyword-search endpoint (/legislacion-consolidada) currently returns a server-side error; the Tribunal Constitucional site only supports structured search (citation number+year, ECLI, magistrado, materia); DYCTEA accepts text-looking parameters but silently ignores them (verified live). Discover BOE documents via es_browse_gazette (by date) or a known BOE id / ELI; TC rulings via es_search_constitutional; TEAC criterios via RG segments or dates. Every response carries a dataset_note.

Licence. Both sources are official public information published as Spanish PSI (public-sector information) open data; reuse presumes acceptance of the respective reuse conditions. This connector relays that public content with attribution and a source_url.

Every BOE 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.

Every Tribunal Constitucional response carries: ecli (e.g. ECLI:ES:TC:2010:31 - TC case law has no ELI, ELI covers legislation only), human_readable_citation (Spanish doctrinal convention, e.g. "STC 31/2010, de 28 de junio"), and source_url.

cd es-eli-mcp
pip install -e .

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

Environment:

• ES_ELI_BASE_URL - default https://www.boe.es/datosabiertos/api
• ES_ELI_TC_BASE_URL - default https://hj.tribunalconstitucional.es
• ES_ELI_DGT_BASE_URL - default https://petete.tributos.hacienda.gob.es
• ES_ELI_TEAC_BASE_URL - default https://serviciostelematicosext.hacienda.gob.es/TEAC/DYCTEA
• ES_ELI_AEPD_BASE_URL - default https://www.aepd.es
• ES_ELI_CACHE_DIR - default ~/.matematic/cache/es-eli
• ES_ELI_AUDIT_DIR - default ~/.matematic/audit

No API key. All five sources are keyless.

• Public data only - read-only against the five official sources; 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 the official *.boe.es / *.tribunalconstitucional.es / *.hacienda.gob.es / *.aepd.es hosts; no LLM provider, no telemetry.
• Verifiable citations - every response is independently checkable via source_url.

See CONSTITUTION.md and DISCOVERY.md.

pip install -e ".[dev]"
pytest tests/ --ignore=tests/test_smoke.py -v   # offline (fixtures)
pytest tests/test_smoke.py -v                   # hits live BOE + TC + DGT + TEAC + AEPD

Apache-2.0. © Matematic Solutions / Wieslaw Mazur.