Calcula o custo real do crédito no cartão (rotativo, parcelamento ou saque). Tabela Price sobre principal + IOF (0,38% fixo + 0,0082%/dia, cap 365d). Saque adiciona +0,38% IOF extra. Lei 14.690/2023: alerta se total excede 2× principal (rotativo/parcelado). Retorna: parcela, total pago, juros, IO...
AI agents call calcular_custo_real_cartao to retrieve information from Contaí — Calculadoras Fiscais Brasileiras without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
modalidade | string | Yes | Modalidade: rotativo (dívida de fatura), parcelado_fatura ou saque em dinheiro |
prazoMeses | integer | Yes | Prazo de pagamento em meses |
currentDate | string | — | Data de referência YYYY-MM-DD para tabelas fiscais (INSS/IRRF/IOF/etc.). Default: hoje. |
taxaMensalPercent | number | Yes | Taxa de juros mensal em % (ex: 15 para 15% a.m. no rotativo) |
valorOriginalCents | integer | Yes | Valor original da dívida/compra em centavos |
Parameters from the server's own tool schema.
Although this tool concerns financial calculations, it is purely computational and informational. It analyzes but does not execute, authorize, or commit any financial transaction. It does not move money, create subscriptions, or bind financial obligations. The tool retrieves/calculates cost estimates based on input parameters, comparable to financial calculators.
From the tool's definition Tool name 'calcular_custo_real_cartao' and description indicate it 'Calcula' (calculates) and 'Retorna' (returns) financial metrics.
Attacks that exploit this kind of access
Calcula o custo real do crédito no cartão (rotativo, parcelamento ou saque). Tabela Price sobre principal + IOF (0,38% fixo + 0,0082%/dia, cap 365d). Saque adiciona +0,38% IOF extra. Lei 14.690/2023: alerta se total excede 2× principal (rotativo/parcelado). Retorna: parcela, total pago, juros, IOF, CET anual, multiplicador do custo. It is categorised as a Read tool in the Contaí — Calculadoras Fiscais Brasileiras MCP Server, which means it retrieves data without modifying state.
calcular_custo_real_cartao accepts 5 parameters: modalidade, prazoMeses, currentDate, taxaMensalPercent, valorOriginalCents. Required: modalidade, prazoMeses, taxaMensalPercent, valorOriginalCents. The full parameter table on this page comes from the server's own tool schema.
Register the Contaí — Calculadoras Fiscais Brasileiras MCP server in PolicyLayer and add a rule for calcular_custo_real_cartao: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Contaí — Calculadoras Fiscais Brasileiras. Nothing to install.
calcular_custo_real_cartao is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the calcular_custo_real_cartao rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for calcular_custo_real_cartao. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
calcular_custo_real_cartao is provided by the Contaí — Calculadoras Fiscais Brasileiras MCP server (@contai-evoluke/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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