Simula o rendimento líquido de um título do Tesouro Direto (Selic/LFT, Prefixado/LTN, IPCA+/NTN-B). Usa capitalização composta com IR regressivo. Fórmula Selic/Prefixado: VF = PV × (1+taxa)^prazoAnos. Fórmula IPCA+: taxaTotal = (1+IPCA/100)×(1+spread/100)−1, VF = PV × (1+taxaTotal)^prazoAnos. IR ...
AI agents call calcular_tesouro_direto_rendimento 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 |
|---|---|---|---|
tipoTitulo | string | Yes | Tipo do título: selic (Tesouro Selic/LFT), prefixado (LTN), ipca_mais (NTN-B/IPCA+) |
currentDate | string | — | Data de referência YYYY-MM-DD para tabelas fiscais (INSS/IRRF/IOF/etc.). Default: hoje. |
dataVencimento | string | Yes | Data de vencimento do título no formato YYYY-MM-DD. Ex: 2028-03-01 |
ipca12mPercent | number | — | IPCA acumulado 12 meses em % ao ano. Usado para IPCA+ (taxaTotal = (1+IPCA)×(1+spread)−1). Default 0. |
taxaAnualPercent | number | Yes | Taxa anual em % ao ano. Para Selic: taxa Selic (ex: 14.75). Para Prefixado: taxa fixada. Para IPCA+: spread real (ex: 7.0 = IPCA + 7%). |
aliquotaIrPercent | number | — | Alíquota IR sobre rendimentos (%). Tabela regressiva: até 180d=22.5, 181-360d=20, 361-720d=17.5, >720d=15. Default 15%. |
valorInicialCents | integer | Yes | Valor investido em centavos. Ex: 1000000 = R$ 10.000,00 |
Parameters from the server's own tool schema.
This tool performs financial calculations and projections but does not execute any actual financial transactions, move money, or modify data. It reads input parameters (investment amount, rate, term) and returns a computed result showing projected net returns. The use of regressive tax rates and specific Treasury formulas confirms it is a pure calculation/simulation tool.
From the tool's definition Simulates/calculates returns on Treasury Direct securities; uses formulas for compounded capitalization with regressive income tax; no state modification, no execution of external operations, no financial movement.
Attacks that exploit this kind of access
Simula o rendimento líquido de um título do Tesouro Direto (Selic/LFT, Prefixado/LTN, IPCA+/NTN-B). Usa capitalização composta com IR regressivo. Fórmula Selic/Prefixado: VF = PV × (1+taxa)^prazoAnos. Fórmula IPCA+: taxaTotal = (1+IPCA/100)×(1+spread/100)−1, VF = PV × (1+taxaTotal)^prazoAnos. IR = alíquota × rendimentoBruto. Simplificações v1: sem taxa de custódia B3 (0,20% a.a.), sem marcação a mercado. Fonte: Tesouro Nacional + Lei 11.033/2004. It is categorised as a Read tool in the Contaí — Calculadoras Fiscais Brasileiras MCP Server, which means it retrieves data without modifying state.
calcular_tesouro_direto_rendimento accepts 7 parameters: tipoTitulo, currentDate, dataVencimento, ipca12mPercent, taxaAnualPercent, aliquotaIrPercent, valorInicialCents. Required: tipoTitulo, dataVencimento, taxaAnualPercent, valorInicialCents. 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_tesouro_direto_rendimento: 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_tesouro_direto_rendimento 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_tesouro_direto_rendimento 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_tesouro_direto_rendimento. 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_tesouro_direto_rendimento 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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