calculate_card_machine_fee
Calcula quanto sobra de uma venda na maquininha e qual o custo efetivo dela ao mês, juntando a taxa da adquirente com o prazo até o dinheiro cair. Compara com o custo de antecipar os recebíveis. Parâmetros obrigatórios: sale_amount, fee_percent. Opcionais: installments, days_to_receive, anticipat...
This record as markdown: /tools/com-falazuki-finance-br/calculate-card-machine-fee.md
What calculate_card_machine_fee does on FalaZuki Finance BR
AI agents call calculate_card_machine_fee 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 |
|---|---|---|---|
fee_percent | number | Yes | Taxa cobrada pela maquininha sobre a venda, em % (ex: 3.5) |
sale_amount | number | Yes | Valor da venda passada na maquininha, em R$ |
installments | integer | — | Em quantas parcelas o cliente pagou (1 = à vista) |
days_to_receive | integer | — | Dias até receber (na venda parcelada, o prazo da primeira parcela; as outras vêm de 30 em 30) |
anticipation_rate_per_month | number | — | Taxa de antecipação por mês adiantado, em % (opcional) |
Parameters from the server's own tool schema.
Why calculate_card_machine_fee is rated Low
Even though calculate_card_machine_fee 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_card_machine_fee 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_card_machine_fee, this is the rule to start with:
calculate_card_machine_fee 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_card_machine_fee call is checked against it from then on.
Questions about calculate_card_machine_fee
Calcula quanto sobra de uma venda na maquininha e qual o custo efetivo dela ao mês, juntando a taxa da adquirente com o prazo até o dinheiro cair. Compara com o custo de antecipar os recebíveis. Parâmetros obrigatórios: sale_amount, fee_percent. Opcionais: installments, days_to_receive, anticipation_rate_per_month. 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_card_machine_fee accepts 5 parameters: fee_percent, sale_amount, installments, days_to_receive, anticipation_rate_per_month. Required: fee_percent, sale_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_card_machine_fee: 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_card_machine_fee 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_card_machine_fee 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_card_machine_fee. 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_card_machine_fee 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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