# calcular_vpl_tir

Calcula VPL (Valor Presente Líquido) e TIR (Taxa Interna de Retorno) de um projeto de investimento. VPL = Σ [FC_t / (1+r)^t] — se VPL > 0, o projeto cria valor acima do custo de capital. TIR = taxa onde VPL = 0 (calculada por Newton-Raphson + bisseção). Payback simples: período em que saldo acumulado fica positivo. Payback descontado: mesmo critério, mas com fluxos trazidos ao valor presente. Índice de Lucratividade = (VPL + investimento) / investimento. Viável = VPL > 0 E TIR > taxa de desconto.

Agent View of the PolicyLayer registry record for `calcular_vpl_tir`. HTML page: https://policylayer.com/tools/io-github-lfhillesheim-contai-mcp-server/calcular-vpl-tir

## Facts

- Tool: `calcular_vpl_tir`
- 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: 3 (2 required)
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `fluxosCents` | array | yes | Array de fluxos de caixa em centavos. O primeiro elemento (índice 0) deve ser negativo (investimento inicial). Os demais são retornos esperados em cada período. |
| `periodicidade` | string | no | Periodicidade dos fluxos de caixa: "anual" (cada elemento representa um ano) ou "mensal" (cada elemento representa um mês). A taxa anual é convertida internamen |
| `taxaDescontoAnualPercent` | number | yes | Taxa mínima de atratividade (TMA) ou custo de capital em % ao ano. Usada para descontar os fluxos futuros ao valor presente. Ex: 10.0 = 10% a.a. (projeto viável |

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_vpl_tir",
    "arguments": {
      "fluxosCents": [],
      "taxaDescontoAnualPercent": 0
    }
  }
}
```

## Why calcular_vpl_tir is rated Low

This is a pure computational tool that analyzes investment metrics based on input cash flows and discount rates. It reads parameters, performs mathematical calculations, and returns analysis results. There are no side effects, no data persistence changes, no financial transactions executed, and no destructive operations.

From the tool's own definition: "Tool performs financial calculations (VPL, TIR, payback, profitability index) on provided investment project parameters. Description explicitly shows it 'Calcula' (calculates) using formulas and mathematical methods (Newton-Raphson, bisection)."

## Use case

AI agents call calcular_vpl_tir 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_vpl_tir": {}
  }
}
```

## Other tools on Contaí — Calculadoras Fiscais Brasileiras (138)

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- `calcular_auxilio_doenca` — Read — https://policylayer.com/tools/io-github-lfhillesheim-contai-mcp-server/calcular-auxilio-doenca.md
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- `calcular_bola_de_neve_dividas` — Read — https://policylayer.com/tools/io-github-lfhillesheim-contai-mcp-server/calcular-bola-de-neve-dividas.md
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- `calcular_calculadora_milhas_passagem` — Read — https://policylayer.com/tools/io-github-lfhillesheim-contai-mcp-server/calcular-calculadora-milhas-passagem.md
- `calcular_calorias_macros` — Read — https://policylayer.com/tools/io-github-lfhillesheim-contai-mcp-server/calcular-calorias-macros.md
- `calcular_capital_de_giro_necessario` — Read — https://policylayer.com/tools/io-github-lfhillesheim-contai-mcp-server/calcular-capital-de-giro-necessario.md
- `calcular_carne_leao` — Read — https://policylayer.com/tools/io-github-lfhillesheim-contai-mcp-server/calcular-carne-leao.md
- `calcular_cartao_credito_cashback_anuidade` — Read — https://policylayer.com/tools/io-github-lfhillesheim-contai-mcp-server/calcular-cartao-credito-cashback-anuidade.md
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- `calcular_consorcio_vs_financiamento` — Read — https://policylayer.com/tools/io-github-lfhillesheim-contai-mcp-server/calcular-consorcio-vs-financiamento.md
- `calcular_consultoria_pj_saude_financeira` — Read — https://policylayer.com/tools/io-github-lfhillesheim-contai-mcp-server/calcular-consultoria-pj-saude-financeira.md
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- …and 108 more: https://policylayer.com/tools/io-github-lfhillesheim-contai-mcp-server.md

## 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