calculate_tesouro_prefixado
Simula o Tesouro Prefixado até o vencimento: taxa contratada composta, IR regressivo, custódia da B3 de 0,20% ao ano (sem faixa isenta, que é só do Selic) e a taxa líquida anual efetiva. Parâmetros obrigatórios: principal, annual_rate, months. Use exatamente estes nomes, em inglês.
This record as markdown: /tools/com-falazuki-finance-br/calculate-tesouro-prefixado.md
What calculate_tesouro_prefixado does on FalaZuki Finance BR
AI agents call calculate_tesouro_prefixado 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 |
|---|---|---|---|
months | integer | Yes | Meses até o vencimento (1-360) |
principal | number | Yes | Valor investido em R$ |
annual_rate | number | Yes | Taxa anual contratada em % (ex: 13.5) |
Parameters from the server's own tool schema.
Why calculate_tesouro_prefixado is rated Low
Even though calculate_tesouro_prefixado 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_tesouro_prefixado 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_tesouro_prefixado, this is the rule to start with:
calculate_tesouro_prefixado 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_tesouro_prefixado call is checked against it from then on.
Questions about calculate_tesouro_prefixado
Simula o Tesouro Prefixado até o vencimento: taxa contratada composta, IR regressivo, custódia da B3 de 0,20% ao ano (sem faixa isenta, que é só do Selic) e a taxa líquida anual efetiva. Parâmetros obrigatórios: principal, annual_rate, 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_tesouro_prefixado accepts 3 parameters: months, principal, annual_rate. Required: months, principal, annual_rate. 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_tesouro_prefixado: 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_tesouro_prefixado 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_tesouro_prefixado 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_tesouro_prefixado. 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_tesouro_prefixado 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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