calculate_rent_vs_buy
Compara alugar vs comprar imóvel considerando custo de oportunidade, valorização e custos totais. Parâmetros obrigatórios: property_value, down_payment, monthly_rent. Opcionais: financing_rate, financing_months, itbi_percent, registry_percent, rent_adjustment, property_appreciation, investment_re...
This record as markdown: /tools/com-falazuki-finance-br/calculate-rent-vs-buy.md
What calculate_rent_vs_buy does on FalaZuki Finance BR
AI agents call calculate_rent_vs_buy 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 |
|---|---|---|---|
down_payment | number | Yes | Entrada disponível em R$ |
itbi_percent | number | — | ITBI em % do valor do imóvel. Varia de 2% a 3% por município. |
monthly_rent | number | Yes | Aluguel mensal equivalente em R$ |
financing_rate | number | — | Taxa de juros anual do financiamento (%) |
property_value | number | Yes | Valor do imóvel em R$ |
rent_adjustment | number | — | Reajuste anual do aluguel em %. |
financing_months | integer | — | Prazo do financiamento em meses |
registry_percent | number | — | Escritura e registro em % do valor do imóvel. |
investment_return | number | — | Retorno anual se investir a entrada (%) |
property_appreciation | number | — | Valorização anual do imóvel (%) |
Parameters from the server's own tool schema.
Why calculate_rent_vs_buy is rated Low
Even though calculate_rent_vs_buy 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.
Risk signalsHigh parameter count (10 properties)
Attacks that exploit this kind of access
The rule that runs calculate_rent_vs_buy 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_rent_vs_buy, this is the rule to start with:
calculate_rent_vs_buy 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_rent_vs_buy call is checked against it from then on.
Questions about calculate_rent_vs_buy
Compara alugar vs comprar imóvel considerando custo de oportunidade, valorização e custos totais. Parâmetros obrigatórios: property_value, down_payment, monthly_rent. Opcionais: financing_rate, financing_months, itbi_percent, registry_percent, rent_adjustment, property_appreciation, investment_return. 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_rent_vs_buy accepts 10 parameters: down_payment, itbi_percent, monthly_rent, financing_rate, property_value, rent_adjustment, financing_months, registry_percent, investment_return, property_appreciation. Required: down_payment, monthly_rent, property_value. 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_rent_vs_buy: 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_rent_vs_buy 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_rent_vs_buy 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_rent_vs_buy. 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_rent_vs_buy 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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