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OpenArg MCP server

Which MCP servers are OpenArg's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-26

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Whose server it is
  • Registry nameorg.openarg/datos-publicosverified in the MCP registry

The registry name sits under openarg.org. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-26
  • Stateanswerschecked 2026-10-26
  • Tools6
  • Server calls itselfopenarg
  • Protocol version2025-06-18

On 2026-10-26 the server answered initialize and tools/list without a sign-in. First answer in 236 ms.

Should an agent connect itNot proven either way yet
  • Its tools do every use case we checked: Trace ministry spending changes across official national datasets; Query Argentine open datasets from an AI assistant via MCP.
  • Checked on 2 of the 7 days it takes to judge reliability.

Once connected

  • For "Query Argentine open datasets from an AI assistant via MCP", the likely first call is consultar_datos_publicos.
  • Parameters are untyped or undescribed in 5 of 6 tools: check arguments before calling.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 2, the first on 2026-10-26
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 2 so far
  • What an agent can do with it2 of 2 use cases
  • Answeredmeasuring2 of the 7 daily checks it takes to print a share
  • Median first answer251 ms
  • Space in an agent's context≈ 1,976 tokensthe definitions of all its tools (6), which an agent carries on every turn
  • Tool definitionsB · 86 of 100
  • Typed results6 of 6 toolsdeclared outputSchema: results come typed, read once
  • Parameters without a description: in 5 of 6

What an agent can do with it

  • can do · Trace ministry spending changes across official national datasets
  • not sure · Compare provincial budget execution with public health data
  • can do · Query Argentine open datasets from an AI assistant via MCP

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

None of the five warning signs in these definitions.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers6 tools · read 2026-10-26
  • consultar_datos_publicos

    Responde una pregunta sobre datos públicos oficiales de Argentina, con fuentes. Ejemplos: "¿Cuál fue la tasa de desempleo del último trimestre?", "Evolución del IPC en 2025", "¿Cuántos diputados tiene cada bloque?", "Presupuesto ejecutado…

  • listar_fuentes

    Lista los portales de datos abiertos que cubre OpenArg y cuántos datasets tiene cada uno. No descuenta preguntas: cuenta como un pedido del modo datos.

  • buscar_datasets

    Busca en el catálogo de OpenArg (más de 30.000 datasets de portales oficiales). Devuelve título, portal, descripción, link a la fuente oficial y las tablas consultables de cada dataset (usalas con `describir_tabla` y `obtener_datos`)…

  • describir_tabla

    Muestra las columnas (con su tipo), cantidad de filas, período cubierto, frescura y una muestra de una tabla. `tabla` es el nombre que devuelve `buscar_datasets`. Usalo antes de `obtener_datos` o `agregar_datos` para saber qué columnas…

  • obtener_datos

    Trae filas de una tabla, en CSV, con la fuente oficial. Para un total, promedio, conteo, mínimo, máximo o ranking NO traigas filas para sumarlas: usá `agregar_datos`. - `columnas`: las que quieras (por defecto, todas); nombres exactos de…

  • agregar_datos

    Calcula en la base una suma, promedio, conteo, mínimo o máximo, opcionalmente agrupado. Usala SIEMPRE que necesites un total, un promedio, un conteo, un mínimo/máximo o un ranking, en vez de traer filas con `obtener_datos` y hacer la…

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "datos-publicos": {
      "type": "http",
      "url": "https://mcp.openarg.org/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http openarg https://mcp.openarg.org/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://mcp.openarg.org/mcp as a custom connector in the settings.

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.