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

Annotations already declare read-only, idempotent, and non-destructive behavior. The description adds context about payment per query and LGPD compliance, which is useful. However, it does not detail side effects, rate limits, or other behavioral aspects beyond what annotations provide.

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 verbose and repetitive, repeating phrases like 'consulta em fonte oficial' and 'informação de fontes e órgãos oficiais brasileiros' and 'não é dado sigiloso'. It could be more concise and better structured, but it does provide some context.

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?

Given the complexity (multiple parameters, authentication, payment), the description lacks essential details such as how to provide credentials, what the output format will be, or how the query is executed. It is incomplete for a user to confidently invoke the tool.

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 provides no descriptions for parameters, and the description does not explain the meaning or usage of parameters like 'a3', 'a3_pin', 'login_cpf', 'login_senha', 'motor', 'placa', 'chassi'. The description only hints at credentials (login) and vehicle fields but leaves most parameter semantics unclear.

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 clearly states it is a query ('consulta') for vehicle information (vehicles) related to engine number (motor), and mentions official sources. However, it is somewhat cryptic with 'BIN' and the exact purpose could be more explicit, but overall it conveys a read-only query action.

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 guidance on when to use this tool versus alternatives. It mentions payment and lack of platform credentials, but does not specify scenarios or compare with other tools. No explicit usage instructions or limitations are given.

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