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Directory / AlertaSubastas
AlertaSubastas
by alertasubastas.com · https://alertasubastas.com/mcp
Search Spain's public auctions (BOE, Social Security, tax agency, notaries) with full asset records.
12 of 12 checks · 11 Nov 2026
At a glance
- Runs where
- On their server. What you send to it goes to them.
- What you need
- Nothing: it answered without a login
- Tools
- 27 tools
- Its own safety labels
- 17 read-only, 4 labeled as deleting or destroying, 6 labeled as changing things
- Memory it takes
- About 6,300 tokens of your AI's memory, just for its tool descriptions
- Largest answer
- About 2.5 KB in our test
- Speed
- Average answer in our test: 176 ms
Tokens are an estimate: the characters in its tool names, descriptions and inputs, divided by 4. The exact number depends on your AI model. Safety labels are what the server says about itself. From our latest test, 11 Nov 2026.
Is AlertaSubastas MCP server safe?
- None of the hidden-instruction wordings we know were found in its 27 tool descriptions.
- Its error messages showed no secrets or internal details.
- 17 of its 27 tools are labeled read-only; the others may change or send things.
- Overall it scored 89/100 on 11 Nov 2026.
A test can only see what the server shows from outside, not what it does with your data behind the scenes. Connect servers from makers you trust.
What this test does not check
- Its source code and packages.
- What a tool quietly does behind the scenes, such as writing a file or calling another service.
- Instructions hidden inside live tool answers. We only look for those in tool descriptions.
- Hidden instructions worded in a way our list doesn't know yet.
- Tools that could change something. Those are read, never run.
What QAmcp can and can't see · How to tell if an MCP server is safe · Hidden instructions · Prompt injection
Known security advisories
Not looked up yet. QAmcp tests how a server behaves. It does not scan source code.
What it can do
27 tools, in the server's own words.
buscar_bienesread-onlyBusca bienes en subasta (BOE, notariales, Seguridad Social, AEAT, ayuntamientos…) y devuelve solo sus IDs, 100 por página.
ver_bienread-onlyDetalle completo de un bien: datos del bien, de su lote y de su subasta (valor, depósito, puja, cargas, situación posesoria, fechas, URL oficial…), subastas si…
ver_subastaread-onlyIDs de los lotes de una subasta, en su orden.
ver_loteread-onlyIDs de los bienes de un lote (se adjudican juntos) y la subasta a la que pertenece.
buscar_por_codigoread-onlyBusca bienes por un identificador: referencia catastral, IDUFIR / CRU, referencia registral, id de subasta del BOE (SUB-…), id de la Seguridad Social o la AEAT…
searchread-onlyBúsqueda de texto libre en subastas para la búsqueda profunda (deep research): devuelve hasta 10 resultados con id, título y URL.
fetchread-onlyFicha de un bien en Markdown (bien, lote, subasta, valor de mercado), para la búsqueda profunda.
listar_provinciasread-onlyProvincias con su slug y nombre exacto, para los filtros.
listar_municipiosread-onlyMunicipios con subastas de una provincia (el nombre es el valor exacto del filtro municipio) y sus comarcas (slug para el filtro comarca).
opciones_filtrosread-onlyValores admitidos por los filtros (tipos de bien y sus grupos, clases de subasta, procedimientos, estados, pujas, vivienda habitual, bienes en el lote, tramos …
explicar_conceptoread-onlyLos 3 artículos de la ayuda de AlertaSubastas que mejor explican una duda sobre subastas públicas o sobre el servicio (depósito, cargas, cesión de remate, pose…
consumoread-onlyPlan, búsquedas, subastas consultadas y subastas finalizadas consultadas este mes con su cuota.
mi_cuentaread-onlyPlan de la cuenta (Personal, Profesional o Empresa), cupos del mes usados y disponibles (búsquedas, subastas consultadas, subastas finalizadas consultadas, ale…
listar_alertasread-onlyAlertas de la cuenta, con el límite del plan y las altas del mes.
ver_alertaread-onlyUna alerta de la cuenta.
alertas_previsualizarread-onlyAntes de crear_alerta: cuántas subastas activas coinciden ahora con esos filtros y una muestra de hasta 5 ids (las más recientes), para ajustar filtros demasia…
crear_alertaCrea una alerta: los bienes nuevos que cumplan los filtros llegan por email.
borrar_alertaBorra una alerta.
pausar_alertaDeja de enviar los avisos de una alerta sin borrarla.
reactivar_alertaVuelve a enviar los avisos de una alerta pausada (revalida los límites del plan).
renombrar_alertaCambia el título de una alerta; vacío o null lo borra.
listar_favoritasread-onlyFavoritas de la cuenta, paginadas: id del bien, URL, comentario, estado de seguimiento (estado), título, cómo está la subasta (subasta: grupo activas/proximas/…
anadir_favoritaGuarda un bien en favoritas.
quitar_favoritaQuita un bien de favoritas.
and 3 more
Test results
Safe mode: only tools labeled read-only were run. How the test works
- !Ready for the newest MCP versionnote
1 warning
- !Uses an older MCP version (2025-06-18). It works today, but it isn't on the July 2026 version (2026-07-28) yet.
- !Every tool is describednote
6 warnings
- !buscar_bienes: Inputs with no description: page
- !renombrar_alerta: Inputs with no description: titulo
- !listar_favoritas: Inputs with no description: limit, offset
- !anadir_favorita: Inputs with no description: comentario
- !comentar_favorita: Inputs with no description: comentario
- !estado_favorita: Inputs with no description: estado
- !Follows MCP best practices (not scored yet)note
1 tip (not scored)
- !Very common tool names: search, fetch. Next to other servers' tools the AI may mix them up; a short prefix helps (like "github_search" instead of "search").
- ✓ConnectsConnected in 1.3 spass
- ✓Lists its toolsFound 27 toolspass
- ✓Tools are labeled safe or dangerousEvery tool has a safety labelpass
- ✓No known hidden instructionsNone of the hidden-instruction wordings we know were found in tool descriptions. New wordings can get past this check.pass
- ✓Tools work with good inputspass
All good
- ✓buscar_bienes: Worked (263 ms)
- ✓ver_bien: Answered with an error, probably because of our sample input: {"error":"invalid_request","message":"argument 'id' must be an id (0x…)"} {"error":"invalid_request","message":"argument 'id' must be an id…
- ✓ver_subasta: Answered with an error, probably because of our sample input: {"error":"invalid_request","message":"argument 'id' must be an id (0x…)"} {"error":"invalid_request","message":"argument 'id' must be an id…
- ✓ver_lote: Answered with an error, probably because of our sample input: {"error":"invalid_request","message":"argument 'id' must be an id (0x…)"} {"error":"invalid_request","message":"argument 'id' must be an id…
- ✓buscar_por_codigo: Answered with an error, probably because of our sample input: {"error":"rate_limited","message":"max 10 calls per minute without an account: retry in a minute","url":"https:\/\/alertasubastas.com\/alta…
- ✓search: Answered with an error, probably because of our sample input: {"error":"rate_limited","message":"max 10 calls per minute without an account: retry in a minute","url":"https:\/\/alertasubastas.com\/alta…
- ✓fetch: Answered with an error, probably because of our sample input: {"error":"rate_limited","message":"max 10 calls per minute without an account: retry in a minute","url":"https:\/\/alertasubastas.com\/alta…
- ✓listar_provincias: Answered with an error, probably because of our sample input: {"error":"rate_limited","message":"max 10 calls per minute without an account: retry in a minute","url":"https:\/\/alertasubastas.com\/alta…
- and 19 more
- ✓Bad inputs give a clean errorpass
All good
- ✓buscar_bienes: Refused wrong type for "filtros" with a clear error
- ✓ver_bien: Refused missing required input "id" with a clear error
- ✓ver_bien: Refused wrong type for "id" with a clear error
- ✓ver_subasta: Refused missing required input "id" with a clear error
- ✓ver_subasta: Refused wrong type for "id" with a clear error
- ✓ver_lote: Refused missing required input "id" with a clear error
- ✓ver_lote: Refused wrong type for "id" with a clear error
- ✓buscar_por_codigo: Refused missing required input "q" with a clear error
- and 14 more
- ✓Fast enoughpass
All good
- ✓Connecting took 1.3 s
- ✓Listing tools took 153 ms
- ✓Average tool answer: 176 ms
- ✓buscar_bienes: Slowest tool: buscar_bienes (263 ms)
- ✓No secrets leakedChecked 48 error messages: no secrets or internal detailspass
- ✓Resources and prompts workpass
All good (3 resources, 1 template, 2 prompts)
- ✓Opened 3 of 3 resources
- ✓alertasubastas://ayuda/{id}: A made-up value gets a clean error (alertasubastas://ayuda/qamcp-test)
- ✓An address that does not exist gets a clean "not found" error
- ✓Opened 2 of 2 prompts
- –Tools work togetherNo tool's answer could be fed into another tool, so there were no chains to test (not counted either way)not tested
Test it yourself
Free and open source. Same checks, same score.
npx qamcp-cli https://alertasubastas.com/mcpShow this score on GitHub
Free for every server in the directory. Paste this into your README: the badge shows the score from our latest test.
[](https://qamcp.dev/s/com-alertasubastas-alertasubastas.html)Score over time
- 11 Nov 202689
One test so far. New tests will show here.
Reviews
Coming soon: reviews from people who use AlertaSubastas, signed in with GitHub, one per person. Reviews never change the score.
QAmcp Monitor tests it every hour and emails you when it goes down, the score drops, a tool changes or a secret leaks. Free for 1 server, no card.
Have a concern, or want it removed? Ask us and we'll take it off the list. How the directory works