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

Annotations already declare readOnlyHint and idempotentHint, and the description aligns with that by stating 'consulta'. It adds useful behavioral context: pay-per-query, no platform credentials needed, and data not confidential. However, it does not describe return format, error behavior, or other side effects beyond cost, so it adds some value but lacks depth.

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 paragraph of about 3 sentences, which is reasonably sized but contains redundancy (e.g., repeating 'consulta em fonte oficial' and later 'consulta informação de fontes e órgãos oficiais'). It front-loads the key purpose but could be tightened without losing meaning.

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?

The tool has 8 parameters (6 required) and no output schema, yet the description provides no information about expected inputs, parameter syntax, or what the response contains. It covers payment and data responsibility but omits essential operational details, making it inadequate for an agent to invoke correctly.

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?

With schema_description_coverage at 0%, the description must explain parameters but does not mention any of the 8 fields (a3, a3_pin, login_cpf, login_senha, chassi, opcoes, cpf, cnpj). No supplementary information is given on what these mean or how to format them, leaving the agent entirely reliant on the schema names, which are cryptic.

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's a query tool for 'Escolha da Placa' (plate choice) using official sources, distinguishing it from sibling tools like authenticate or connect. It specifies the nature of the query and the source, making the purpose understandable but not deeply precise about the exact output.

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?

No guidance on when to use this tool versus alternatives is provided. It mentions payment and lack of platform credentials but does not compare with other tools or specify scenarios where this is the appropriate choice. There is no 'when not to use' or alternative naming.

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