compare_with_cdb
Compara um CDB que rende X% do CDI vs alternativas (Tesouro Selic, LCI/LCA, poupança) usando o CDI atual do Banco Central. Retorna rendimento líquido pós-IR e diferença em R$ entre cada opção pra um aporte e prazo dados. Parâmetros obrigatórios: principal, cdi_percent, months. Opcionais: lci_perc...
This record as markdown: /tools/com-falazuki-finance-br/compare-with-cdb.md
What compare_with_cdb does on FalaZuki Finance BR
AI agents call compare_with_cdb 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 | Prazo em meses (1-360) |
principal | number | Yes | Valor a investir em R$ |
cdi_percent | number | Yes | Percentual do CDI que o CDB rende (ex: 110 = 110% do CDI; 100 = 100% do CDI) |
lci_percent | number | — | Percentual do CDI da LCI/LCA pra incluir na comparação (opcional, ex: 95) |
Parameters from the server's own tool schema.
Why compare_with_cdb is rated Low
Even though compare_with_cdb 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 compare_with_cdb 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 compare_with_cdb, this is the rule to start with:
compare_with_cdb 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 compare_with_cdb call is checked against it from then on.
Questions about compare_with_cdb
Compara um CDB que rende X% do CDI vs alternativas (Tesouro Selic, LCI/LCA, poupança) usando o CDI atual do Banco Central. Retorna rendimento líquido pós-IR e diferença em R$ entre cada opção pra um aporte e prazo dados. Parâmetros obrigatórios: principal, cdi_percent, months. Opcionais: lci_percent. 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.
compare_with_cdb accepts 4 parameters: months, principal, cdi_percent, lci_percent. Required: months, principal, cdi_percent. 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 compare_with_cdb: 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.
compare_with_cdb 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 compare_with_cdb 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 compare_with_cdb. 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.
compare_with_cdb 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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