Calcula ITBI (imposto de transmissão de bem imóvel) na compra. Tributo municipal pago à prefeitura na escritura. Alíquota varia por município (1.5%-3%). A base de cálculo é o maior entre o valor da transação e o valor venal de referência da prefeitura. Imóveis pelo SFH (1º imóvel familiar) têm re...
AI agents call calcular_itbi 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 |
|---|---|---|---|
aliquotaPercent | number | — | Alíquota municipal (%). SP=3, Blumenau=2, capitais ~2-3%. Default 3. |
valorVenalCents | integer | — | Valor venal de referência do município em centavos (opcional). Quando informado, a base de cálculo será max(valorVenalCents, valorTransacaoCents). Se omitido, u |
sfhPrimeiroImovel | boolean | — | SFH 1º imóvel: redução 50% até R$ 109.733,02 (teto SFH 2026), excedente paga cheio. Default false. |
valorTransacaoCents | integer | Yes | Valor da transação (preço de compra e venda) em centavos |
Parameters from the server's own tool schema.
This is a pure calculation/query tool that retrieves or computes tax information based on input parameters and legal rules. It does not create, modify, delete, or execute financial transactions. It provides informational output (calculation results) without side effects.
From the tool's definition Tool name 'calcular_itbi' and description explicitly states it 'Calcula' (calculates) and 'Retorna valor a pagar + alíquota efetiva' (returns value to pay + effective rate).
Attacks that exploit this kind of access
Calcula ITBI (imposto de transmissão de bem imóvel) na compra. Tributo municipal pago à prefeitura na escritura. Alíquota varia por município (1.5%-3%). A base de cálculo é o maior entre o valor da transação e o valor venal de referência da prefeitura. Imóveis pelo SFH (1º imóvel familiar) têm redução 50% até teto SFH (R$ 109.733,02 em 2026). Retorna valor a pagar + alíquota efetiva. Fonte: CTN art. 156 III + Lei 8.692/93 (SFH) + legislação municipal. It is categorised as a Read tool in the Contaí — Calculadoras Fiscais Brasileiras MCP Server, which means it retrieves data without modifying state.
calcular_itbi accepts 4 parameters: aliquotaPercent, valorVenalCents, sfhPrimeiroImovel, valorTransacaoCents. Required: valorTransacaoCents. 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_itbi: 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_itbi 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_itbi 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_itbi. 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_itbi 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.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
Teams ship this data inside their own products. See what a licence covers →