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MCP Compras.gov.br

io.github.opedrosoares/mcp-compras in the official MCP registry. Endpoint https://mcp-compras.up.railway.app/mcp. Source: github.com/opedrosoares/MCP_Compras.

The registry describes it as: Preços, atas, contratos e sanções das APIs públicas de compras do governo brasileiro

We read its 100 tools on 2026-10-29. Nothing in them matched our tool-poisoning rules. It also sets server instructions, text a client puts in front of the model on connect; those were read too.

A clean read means these rules found nothing, not that the server is harmless. A server can change its tools at any time, which is why the index reads it again every week.

Connect it

The endpoint answers MCP over HTTP; that is how we read it. Add it to your client:

Claude Code

claude mcp add --transport http mcp-compras https://mcp-compras.up.railway.app/mcp

Cursor: ~/.cursor/mcp.json

{
  "mcpServers": {
    "mcp-compras": {
      "url": "https://mcp-compras.up.railway.app/mcp"
    }
  }
}

VS Code

code --add-mcp '{"name":"mcp-compras","type":"http","url":"https://mcp-compras.up.railway.app/mcp"}'

Some servers ask you to sign in the first time a client connects, or want a key from the people who run them; the server's own docs say which.

Let Claude Code check servers as it adds them

With the free lazaretto-guard plugin installed, when Claude Code adds a server for you or writes one into an MCP config, the plugin reads the server's tools first and asks you if one of our rules matches. Install it, restart Claude Code, then ask it to run the command above.

Install lazaretto-guard

claude plugin marketplace add jamesdfinance-dev/lazaretto-plugins
claude plugin install lazaretto-guard@lazaretto-plugins

Tools it advertises

compras_aggregate_contratacoes_por_periodo compras_comparar_periodos_contratacoes compras_arp_listar compras_arp_consultar compras_arp_por_fim_vigencia compras_arp_buscar_por_objeto compras_arp_itens_listar compras_arp_unidades_item compras_arp_saldo_item compras_arp_adesoes_item compras_pncp_atas_listar compras_catmat_listar_grupos compras_catmat_listar_classes compras_catmat_consultar compras_catmat_listar_pdms compras_catmat_buscar compras_catser_listar_secoes compras_catser_listar_classes compras_catser_consultar compras_pesquisar_precos_para_etp compras_checar_sancoes_fornecedor compras_montar_dossie_arp compras_buscar_contratacoes_similares compras_perfil_fornecedor_completo compras_contratacoes_14133_listar compras_contratacoes_14133_consultar compras_contratacoes_14133_itens_listar compras_contratacoes_14133_itens_por_contratacao compras_contratacoes_14133_resultados_listar compras_contratacoes_14133_resultados_por_contratacao compras_legado_licitacoes_listar compras_legado_licitacao_consultar compras_legado_itens_licitacao_listar compras_legado_pregoes_listar compras_legado_compras_sem_licitacao compras_legado_rdc_listar compras_legado_itens_pregao_listar compras_legado_itens_sem_licitacao_listar compras_contratos_listar compras_contratos_consultar compras_contratos_listar_por_fim_vigencia compras_contratos_itens_listar compras_contratos_item_consultar compras_contrato_comprasnet_consultar compras_contrato_comprasnet_por_uasg compras_contrato_historico_aditivos compras_contrato_garantias compras_contrato_faturas compras_contrato_ocorrencias compras_contrato_responsaveis compras_contrato_empenhos compras_contrato_publicacoes compras_contrato_cronograma compras_listar_prompts compras_obter_prompt compras_listar_resources compras_obter_resource compras_fornecedor_cnpj_receita compras_fornecedor_consultar compras_fornecedor_listar and 40 more

Run this server? Show the check in your README

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Markdown

[![MCP tool check](https://lazaretto.dev/mcp-registry/io-github-opedrosoares-mcp-compras/badge.svg)](https://lazaretto.dev/mcp-registry/io-github-opedrosoares-mcp-compras)

How this was checked

Lazaretto connects to the endpoint the way any MCP client does, asks the server to introduce itself and list its tools, and reads every name, description, parameter schema and server instruction for tool poisoning: hidden directive blocks, orders to read local secrets, parameters built to carry secrets or the conversation out, orders that redirect another server's tools, and invisible characters. It never calls a tool. What we found across the registry.

To run the same check every time Claude Code adds a server, install the free lazaretto-guard plugin. Browse every server in the index.