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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint, so the safety profile is covered. The description adds meaningful behavioral context beyond annotations: 'pague por consulta com crédito pré-pago,' 'sem credenciais da plataforma,' 'não é dado sigiloso,' and the LGPD controller responsibility. This helps the agent understand cost, authentication assumptions, and data sensitivity.

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 compact four-sentence paragraph with the purpose front-loaded in the first sentence. Each sentence adds relevant context: purpose, hosting/payment, official data source, and LGPD responsibility. It is not overly verbose, though the legal sentence is somewhat boilerplate.

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?

With six required parameters and no output schema, the description needed to provide parameter meanings and response expectations, but it does not. It gives good high-level context about official sources and payment, but an agent still cannot reliably construct a valid request or interpret the result.

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?

Schema description coverage is 0%, and the description does not explain any of the six required parameters (a3, a3_pin, login_cpf, login_senha, placa, renavam). It only indirectly suggests that credentials are not platform credentials, which is insufficient for an agent to know how to fill the fields correctly.

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 opens with 'ECRVSP Documentos: Impressão Baixa de Veículo, consulta em fonte oficial,' which names the specific resource (ECRVSP vehicle deregistration documents) and the action (querying an official source). This clearly distinguishes the tool from the generic sibling tools like authenticate, connect, and marketplace.

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 gives practical usage context: 'sem credenciais da plataforma, pague por consulta com crédito pré-pago' tells the agent that platform auth is not needed and that prepaid credits are consumed per query. It also clarifies that the data comes from official Brazilian sources and is non-confidential, though it does not explicitly name alternative tools or exclusion conditions.

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