compare_fuel
Compara álcool e gasolina pelo custo por quilômetro rodado, usando o rendimento real do carro, e diz quanto a escolha vale em reais por mês. Também informa o que a regra dos 70% diria, e quando ela erra. Parâmetros obrigatórios: alcohol_price, gasoline_price. Opcionais: alcohol_km_per_liter, gaso...
This record as markdown: /tools/com-falazuki-finance-br/compare-fuel.md
What compare_fuel does on FalaZuki Finance BR
AI agents call compare_fuel 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 |
|---|---|---|---|
km_per_month | number | — | Quilometragem mensal, para converter a diferença em reais. |
alcohol_price | number | Yes | Preço do álcool por litro |
gasoline_price | number | Yes | Preço da gasolina por litro |
alcohol_km_per_liter | number | — | Rendimento no álcool, em km/l. Padrão 7, o carro médio. |
gasoline_km_per_liter | number | — | Rendimento na gasolina, em km/l. Padrão 10, o carro médio. |
Parameters from the server's own tool schema.
Why compare_fuel is rated Low
Even though compare_fuel 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_fuel 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_fuel, this is the rule to start with:
compare_fuel 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_fuel call is checked against it from then on.
Questions about compare_fuel
Compara álcool e gasolina pelo custo por quilômetro rodado, usando o rendimento real do carro, e diz quanto a escolha vale em reais por mês. Também informa o que a regra dos 70% diria, e quando ela erra. Parâmetros obrigatórios: alcohol_price, gasoline_price. Opcionais: alcohol_km_per_liter, gasoline_km_per_liter, km_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.
compare_fuel accepts 5 parameters: km_per_month, alcohol_price, gasoline_price, alcohol_km_per_liter, gasoline_km_per_liter. Required: alcohol_price, gasoline_price. 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_fuel: 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_fuel 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_fuel 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_fuel. 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_fuel 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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