massa MCP Server

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answering

massa is answering right now. Last checked 4 min ago. It exposes 5 tools.

Massa de teste brasileira válida: CPF, CNPJ, cartão, conta e mais, em CSV, JSON, SQL ou Excel.

The linked repository no longer exists on GitHub — it was deleted or made private.

Uptime history 10 days of history · worst day 99%

10 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

890 ms

Response time

average over 24h

open, no key

Access

streamable-http

massa missed one check this week

Everything else answered, so this is steady rather than shaky. We check every 15 minutes, which is how a one-off gets told apart from the start of a pattern, and how you hear about the next one within the hour instead of from your users.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 4 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add massa --transport http https://massa.criando.dev/mcp

Settings → Connectors → Add custom connector, then paste this address

https://massa.criando.dev/mcp

~/.codex/config.toml

[mcp_servers.massa]
url = "https://massa.criando.dev/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "massa": {
      "url": "https://massa.criando.dev/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "massa": {
      "type": "http",
      "url": "https://massa.criando.dev/mcp"
    }
  }
}

Available tools 5

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

gerar

gerar

Gera massa de teste a partir de um schema JSON do massa e devolve o arquivo como texto (csv, json ou script sql). Até 100 linhas por chamada; acima disso nada é gerado e a resposta traz o schema e um curl para a API (/api/generate), que gera o volume todo. Com formato xlsx (Excel), devolve um link que baixa o arquivo, sem o teto de linhas: mostre o link ao usuário exatamente como veio. Sem seed no schema, uma é sorteada e devolvida: com a mesma seed e o mesmo schema, o resultado é idêntico. Schema inválido volta como erro com as mensagens campo a campo.

gerar_documento

Gera de 1 a 100 documentos válidos de um tipo: cpf, cnpj, cartao (número, validade e CVV), conta (banco, agência e conta com DV) ou senha. Os dígitos verificadores são calculados, não inventados. Cada tipo aceita só as suas opções (uf no cpf, alfanumerico no cnpj, bandeira no cartao, banco na conta, as regras de tamanho e caracteres na senha); opção que não vale para o tipo é erro. Devolve também a seed usada.

importar

importar_ddl

Converte um CREATE TABLE (Postgres, MySQL, Oracle ou SQL Server) num schema do massa: o tipo de cada coluna sai do nome (nr_cpf vira cpf), do CHECK ou do tipo SQL. Devolve o schema, o nome da tabela, o dialeto e avisos de colunas a revisar. Passe o schema a gerar (com tabela e dialeto) para obter os INSERT.

listar

listar_tipos

Lista os tipos de campo que o massa gera (nome, cpf, cnpj, cartao_credito, agencia, data_nascimento, senha…), com grupo, descrição e parâmetros de cada um, e o formato do schema JSON que a ferramenta gerar recebe. Chame antes de montar um schema.

validar

validar_documento

Confere se um número é válido pela regra oficial: cpf, cnpj (inclusive alfanumérico), cnh, pis, cns, rg (SP), titulo_eleitor, cartao (bandeira, tamanho e Luhn; devolve a bandeira), agencia (precisa do banco) e conta (precisa do banco e da agência). Aceita com ou sem máscara. Não gera nada.

Endpoints

URL	Transport	State	Latency	Checked
https://massa.criando.dev/mcp	streamable-http	answering	862 ms	4 min ago

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massa — questions

Answers built from our own checks of this server.

What can massa do?

It exposes 5 tools, read directly from the server on our last check. Among them: gerar, gerar_documento, importar_ddl, listar_tipos, validar_documento. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is massa working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 890 ms. The bar chart above shows every period we have measured.

Is massa still maintained?

The linked repository no longer exists on GitHub — it was deleted or made private. We show this because it changes what you can expect: an unmaintained server may keep answering for months and then stop without warning.

How do I connect massa?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does massa need an API key?

No. massa completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 5 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is massa?

It answers our handshake in 890 ms on average, which is faster than 9% of all working MCP servers we measure. That is on the slow side — worth knowing if the tool sits inside an interactive loop. The comparison comes from our own checks across the whole registry, every 15 minutes.