Calcula IPVA (imposto sobre propriedade de veículos automotores) anual. Tributo estadual com alíquotas por tipo: auto ~4%, moto ~2%, caminhão ~1.5%. Base = valor FIPE. SP/RJ dão ~3% desconto à vista. Útil pra orçar custo total de carro/moto. Fonte: CF art. 155 III + legislação estadual + tabela F...
AI agents call calcular_ipva 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 |
|---|---|---|---|
tipo | string | Yes | Tipo do veículo — define alíquota |
estado | string | Yes | UF de licenciamento. "outros" usa média nacional. |
valorFipeCents | integer | Yes | Valor de mercado FIPE do veículo em centavos |
descontoAVistaPercent | number | — | Desconto à vista (%). SP/RJ típico 3%. Default 3, 0 se não aplicável. |
Parameters from the server's own tool schema.
This is a pure calculation tool that takes vehicle information as input and returns a computed tax amount. It retrieves or derives information (tax calculations based on established rates and FIPE values) with no side effects, data modification, code execution, or destructive operations. It falls cleanly under Read category as a computational query.
From the tool's definition Tool description states it 'Calcula IPVA' (calculates IPVA tax) based on vehicle value, type, and state-specific rates.
Attacks that exploit this kind of access
Calcula IPVA (imposto sobre propriedade de veículos automotores) anual. Tributo estadual com alíquotas por tipo: auto ~4%, moto ~2%, caminhão ~1.5%. Base = valor FIPE. SP/RJ dão ~3% desconto à vista. Útil pra orçar custo total de carro/moto. Fonte: CF art. 155 III + legislação estadual + tabela FIPE. It is categorised as a Read tool in the Contaí — Calculadoras Fiscais Brasileiras MCP Server, which means it retrieves data without modifying state.
calcular_ipva accepts 4 parameters: tipo, estado, valorFipeCents, descontoAVistaPercent. Required: tipo, estado, valorFipeCents. 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_ipva: 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_ipva 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_ipva 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_ipva. 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_ipva 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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