# calcular_ir_renda_variavel_b3

Calcula o DARF mensal da B3 considerando MÚLTIPLAS operações em swing trade (15%, isenção R$ 20k/mês), day trade (20%) e FII (20%) numa única chamada. Compensa prejuízos por modalidade e deduz IRRF retido. Retorna: porModalidade (resultado individual com DARF/IR/lucro tributável de cada modalidade), darfTotalCents, irDevidoTotalCents, lucroTributavelTotalCents.

Agent View of the PolicyLayer registry record for `calcular_ir_renda_variavel_b3`. HTML page: https://policylayer.com/tools/io-github-lfhillesheim-contai-mcp-server/calcular-ir-renda-variavel-b3

## Facts

- Tool: `calcular_ir_renda_variavel_b3`
- Server: Contaí — Calculadoras Fiscais Brasileiras (`@contai-evoluke/mcp-server`) — https://policylayer.com/tools/io-github-lfhillesheim-contai-mcp-server.md
- Install: `npx -y @contai-evoluke/mcp-server`
- Homepage: https://github.com/lfhillesheim/calculadora
- Risk category: Read (Low risk)
- Registry record: grade B, identity unverified
- Server rate-limited: no
- Parameters: 4 (1 required)
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `operacoes` | array | yes | Lista de operações do mês (1 a 100). Cada item: { modalidade, tipo, valorCents, irrfCents? }. BREAKING: v2.0.0 — antes 1 chamada por modalidade. Agora a engine |
| `prejuizoAcumuladoDayCents` | integer | no | Prejuízo acumulado de meses anteriores em day trade (centavos). Default 0 |
| `prejuizoAcumuladoFiiCents` | integer | no | Prejuízo acumulado de meses anteriores em FII (centavos). Default 0 |
| `prejuizoAcumuladoSwingCents` | integer | no | Prejuízo acumulado de meses anteriores em swing trade (centavos). Default 0 |

Parameters from the server's own tool schema.

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "calcular_ir_renda_variavel_b3",
    "arguments": {
      "operacoes": []
    }
  }
}
```

## Why calcular_ir_renda_variavel_b3 is rated Low

This is a calculation/query tool that takes trading operation data as input and returns computed tax liability figures (DARF, IR owed, taxable profit). It performs no writes to external systems, no destructions, no actual financial transactions, and no code execution—only mathematical computation and data retrieval.

From the tool's own definition: "Tool description: 'Calcula o DARF mensal da B3' and 'Retorna: porModalidade, darfTotalCents, irDevidoTotalCents, lucroTributavelTotalCents'."

## Use case

AI agents call calcular_ir_renda_variavel_b3 to retrieve information from Contaí — Calculadoras Fiscais Brasileiras without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

## Recommended policy (PolicyLayer)

Verdict: **Allowed**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Contaí — Calculadoras Fiscais Brasileiras:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "calcular_ir_renda_variavel_b3": {}
  }
}
```

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## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=io-github-lfhillesheim-contai-mcp-server · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/io-github-lfhillesheim-contai-mcp-server