Calcula porcentagens em 5 modos: X% de Y, X é quantos % de Y, variação %, aumentar ou diminuir por %.
AI agents call calcular_porcentagem to retrieve information from Contaí — Calculadoras Fiscais Brasileiras without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
a | number | Yes | Primeiro valor (base ou numerador conforme o modo) |
b | number | Yes | Segundo valor (total, taxa ou variação conforme o modo) |
operation | string | Yes | Modo: percent_of (X% de Y), what_percent (X é quanto % de Y), percent_change (variação %), increase_by (aumentar por %), decrease_by (diminuir por %) |
Parameters from the server's own tool schema.
This is a pure calculation utility that reads input values and returns computed percentages. It has no side effects, does not modify data, execute code, delete anything, or involve financial transactions. The most severe effect of misuse would be incorrect calculations, which is informational only. Classified as Read with low severity.
From the tool's definition Tool name 'calcular_porcentagem' and description indicate it performs percentage calculations (X% of Y, variation %, increase/decrease by %) with no modification of external state or data. It retrieves computed results based on inputs.
Attacks that exploit this kind of access
Calcula porcentagens em 5 modos: X% de Y, X é quantos % de Y, variação %, aumentar ou diminuir por %. It is categorised as a Read tool in the Contaí — Calculadoras Fiscais Brasileiras MCP Server, which means it retrieves data without modifying state.
calcular_porcentagem accepts 3 parameters: a, b, operation. Required: a, b, operation. The full parameter table on this page comes from the server's own tool schema.
Register the Contaí — Calculadoras Fiscais Brasileiras MCP server in PolicyLayer and add a rule for calcular_porcentagem: 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 Contaí — Calculadoras Fiscais Brasileiras. Nothing to install.
calcular_porcentagem 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 calcular_porcentagem 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 calcular_porcentagem. 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.
calcular_porcentagem is provided by the Contaí — Calculadoras Fiscais Brasileiras MCP server (@contai-evoluke/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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