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CDF Finance

by io.github.VessellTech
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Melhor dia para comprar no cartão

best_card_day
Read-only

Avisa, para cada cartão do usuário, quando hoje é véspera do fechamento da fatura — comprar amanhã em vez de hoje cairia na fatura seguinte, ganhando mais dias até o vencimento para pagar. Só sinaliza cartões onde essa diferença é ≥15 dias; cartões sem closingDay/dueDay configurado são ignorados. Lista vazia se nenhum cartão estiver na véspera do fechamento.

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "best_card_day"
  }
}

Input Schema

NameRequiredDescriptionDefault

No arguments

Output Schema

NameRequiredDescriptionDefault
dataYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observed

TDQS

A4.5/5.0
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint=true and destructiveHint=false, so the read-only nature is covered. The description adds valuable behavior beyond annotations: the 15-day threshold, ignoring unconfigured cards, and returning an empty list when no card qualifies. It could also mention edge cases or errors, but this is solid context.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Three compact sentences carry the full meaning: the core alert, the filter condition, and the empty-result behavior. The description is front-loaded and every sentence earns its place.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a zero-parameter, read-only tool with no output schema, the description explains when it triggers, which cards are excluded, the threshold used, and the empty-list fallback. An agent has enough information to invoke the tool and interpret the result.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The input schema has zero parameters, so there is no parameter semantics to clarify. The description correctly implies that the tool derives its behavior from the user's card data rather than explicit arguments, matching the baseline 4 for zero-parameter tools.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description states a specific verb and resource: it warns the user, for each card, when today is the eve of invoice closing, and explains the practical benefit of postponing a purchase. This clearly distinguishes it from list_cards and other invoice-related sibling tools.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

It clearly specifies the triggering condition (day before closing), the ≥15-day difference threshold, and the handling of cards without closingDay/dueDay. It does not explicitly name alternatives or state when not to use the tool, which keeps it from a 5.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

All CDF Finance toolsInspect
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