calcular_custo_oportunidade_poupanca
Calcula o custo de oportunidade de manter dinheiro na poupança em vez de investir em CDI ou renda fixa melhor. Compara rendimento líquido (após IR pela tabela regressiva) da poupança, CDI e renda fixa no prazo informado. Retorna a perda financeira de cada alternativa versus a poupança e o multipl...
This record as markdown: /tools/io-github-lfhillesheim-contai-mcp-server/calcular-custo-oportunidade-poupanca.md
What calcular_custo_oportunidade_poupanca does on Contaí — Calculadoras Fiscais Brasileiras
AI agents call calcular_custo_oportunidade_poupanca to retrieve information from Contaí — Calculadoras Fiscais Brasileiras without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
prazoAnos | integer | Yes | Prazo de investimento em anos inteiros (1 a 30). |
valorCents | integer | Yes | Valor investido em centavos. Ex: R$ 10.000 → 1000000. |
taxaCDIAnualPct | number | — | Taxa CDI anual de referência (%). Padrão: 10,5%. |
taxaPoupancaAnualPct | number | — | Taxa anual da poupança (%). Padrão: 6,17% (70% da Selic estimada). |
taxaRendaFixaAnualPct | number | — | Taxa de um CDB/LCI/LCA de renda fixa melhor (% ao ano). Padrão: 11%. |
Parameters from the server's own tool schema.
Why calcular_custo_oportunidade_poupanca is rated Low
This is a pure calculation and analysis tool that compares financial scenarios. It takes user-provided information (principal amount, investment type, timeframe) and returns computed financial metrics and comparisons. No actual financial transactions occur, no data is modified in external systems, and no money is moved.
From the tool's definition The tool 'calcular_custo_oportunidade_poupanca' performs financial calculations and comparisons ('Compara rendimento líquido', 'Retorna a perda financeira', 'multiplicador de capital') based on provided input parameters.
Attacks that exploit this kind of access
The rule that runs calcular_custo_oportunidade_poupanca safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Contaí — Calculadoras Fiscais Brasileiras, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For calcular_custo_oportunidade_poupanca, this is the rule to start with:
calcular_custo_oportunidade_poupanca is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Contaí — Calculadoras Fiscais Brasileiras, apply this rule, and every calcular_custo_oportunidade_poupanca call is checked against it from then on.
Questions about calcular_custo_oportunidade_poupanca
Calcula o custo de oportunidade de manter dinheiro na poupança em vez de investir em CDI ou renda fixa melhor. Compara rendimento líquido (após IR pela tabela regressiva) da poupança, CDI e renda fixa no prazo informado. Retorna a perda financeira de cada alternativa versus a poupança e o multiplicador de capital em cada opção. 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_oportunidade_poupanca accepts 5 parameters: prazoAnos, valorCents, taxaCDIAnualPct, taxaPoupancaAnualPct, taxaRendaFixaAnualPct. Required: prazoAnos, valorCents. 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_oportunidade_poupanca: 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_oportunidade_poupanca 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_oportunidade_poupanca 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_oportunidade_poupanca. 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_oportunidade_poupanca 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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