getCreditCardInvoicePayment

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It only states that the tool returns a payment entry, without elaborating on error handling, nullability, or other behavioral traits. No additional context beyond the name is given.

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

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

The description is a single, clear sentence with no unnecessary wording. It is efficiently structured and front-loaded, earning its place despite its brevity.

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

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

Although the tool has an output schema, the description lacks usage guidelines and parameter explanations. For a two-parameter operation, the description is too sparse to support confident invocation or understanding of the tool's role within the API.

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

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

The schema has no descriptions for the required parameters 'id' and 'invoice_id', and the description does not clarify their roles. It only vaguely mentions an invoice relation, leaving the parameter semantics ambiguous. Since schema coverage is 0%, the description should compensate but fails to do so.

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

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

The description uses the specific verb 'Retorna' (returns) and identifies the resource as 'lançamento de pagamento referente a uma fatura' (payment entry related to an invoice). This clearly distinguishes it from sibling tools like getCreditCardInvoice, which returns an invoice, and getTransactions. No ambiguity about the tool's function.

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

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

The description does not provide any guidance on when to use this tool versus alternatives. It does not mention context, preconditions, or exclusions, leaving the agent without sufficient information for tool selection.

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