calculate_darf
Calcula o DARF mensal de renda variável da pessoa física: ações swing trade (15%, isenção de vendas até R$ 20 mil/mês), day-trade (20%, IRRF compensável) e FIIs (20%), com compensação de prejuízo por modalidade. Opcionais: swing_result, swing_sales, swing_loss_carryforward, daytrade_result, daytr...
This record as markdown: /tools/com-falazuki-finance-br/calculate-darf.md
What calculate_darf does on FalaZuki Finance BR
AI agents call calculate_darf 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 |
|---|---|---|---|
fii_result | number | — | Resultado do mês com FIIs em R$ (negativo = prejuízo) |
swing_sales | number | — | Total de VENDAS de ações à vista no mês em R$ (régua da isenção de 20 mil) |
swing_result | number | — | Resultado do mês com ações swing trade em R$ (negativo = prejuízo) |
irrf_withheld | number | — | IRRF retido na fonte no mês (dedo-duro), compensável, em R$ |
daytrade_result | number | — | Resultado do mês com day-trade em R$ (negativo = prejuízo) |
fii_loss_carryforward | number | — | Prejuízo acumulado de FIIs em R$ |
swing_loss_carryforward | number | — | Prejuízo acumulado de swing trade de meses anteriores em R$ |
daytrade_loss_carryforward | number | — | Prejuízo acumulado de day-trade em R$ |
Parameters from the server's own tool schema.
Why calculate_darf is rated Low
Even though calculate_darf 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_darf 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_darf, this is the rule to start with:
calculate_darf 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_darf call is checked against it from then on.
Questions about calculate_darf
Calcula o DARF mensal de renda variável da pessoa física: ações swing trade (15%, isenção de vendas até R$ 20 mil/mês), day-trade (20%, IRRF compensável) e FIIs (20%), com compensação de prejuízo por modalidade. Opcionais: swing_result, swing_sales, swing_loss_carryforward, daytrade_result, daytrade_loss_carryforward, fii_result, fii_loss_carryforward, irrf_withheld. 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_darf accepts 8 parameters: fii_result, swing_sales, swing_result, irrf_withheld, daytrade_result, fii_loss_carryforward, swing_loss_carryforward, daytrade_loss_carryforward. 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_darf: 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_darf 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_darf 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_darf. 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_darf 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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