calculate_credit_card_interest
Calcula juros do crédito rotativo do cartão e compara com parcelamento da fatura. Mostra o custo real de pagar o mínimo. Parâmetros obrigatórios: bill_amount. Opcionais: minimum_payment_percent, revolving_rate, installment_rate, installment_months. Use exatamente estes nomes, em inglês.
This record as markdown: /tools/com-falazuki-finance-br/calculate-credit-card-interest.md
What calculate_credit_card_interest does on FalaZuki Finance BR
AI agents call calculate_credit_card_interest to retrieve information from FalaZuki Finance BR 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 |
|---|---|---|---|
bill_amount | number | Yes | Valor total da fatura em R$ |
revolving_rate | number | — | Taxa de juros rotativo mensal (%, padrão 14%) |
installment_rate | number | — | Taxa de juros do parcelamento mensal (%, padrão 8%) |
installment_months | integer | — | Parcelas do parcelamento |
minimum_payment_percent | number | — | % do pagamento mínimo (padrão 15%) |
Parameters from the server's own tool schema.
Why calculate_credit_card_interest is rated Low
Even though calculate_credit_card_interest only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.
Attacks that exploit this kind of access
The rule that runs calculate_credit_card_interest safely
PolicyLayer is an MCP gateway: it sits between your AI agents and FalaZuki Finance BR, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For calculate_credit_card_interest, this is the rule to start with:
calculate_credit_card_interest 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 FalaZuki Finance BR, apply this rule, and every calculate_credit_card_interest call is checked against it from then on.
Questions about calculate_credit_card_interest
Calcula juros do crédito rotativo do cartão e compara com parcelamento da fatura. Mostra o custo real de pagar o mínimo. Parâmetros obrigatórios: bill_amount. Opcionais: minimum_payment_percent, revolving_rate, installment_rate, installment_months. Use exatamente estes nomes, em inglês. It is categorised as a Read tool in the FalaZuki Finance BR MCP Server, which means it retrieves data without modifying state.
calculate_credit_card_interest accepts 5 parameters: bill_amount, revolving_rate, installment_rate, installment_months, minimum_payment_percent. Required: bill_amount. The full parameter table on this page comes from the server's own tool schema.
Register the FalaZuki Finance BR MCP server in PolicyLayer and add a rule for calculate_credit_card_interest: 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 FalaZuki Finance BR. Nothing to install.
calculate_credit_card_interest 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 calculate_credit_card_interest 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 calculate_credit_card_interest. 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.
calculate_credit_card_interest is provided by the FalaZuki Finance BR MCP server (https://mcp.falazuki.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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