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

The description adds significant context beyond annotations: it reveals a prepaid credit payment model, states no platform credentials are needed, clarifies the data is from official Brazilian sources and not confidential, and mentions LGPD compliance responsibilities. These are valuable behavioral disclosures not covered by annotations, which only indicate read-only and idempotent hints.

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 moderate length with a mix of functional, commercial, and legal information. It is not overly verbose, but the content is not well-structured and could be more front-loaded with a clearer action statement. Some sentences (e.g., about LGPD) are important but add length without improving usability.

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 11 parameters, no output schema, and zero parameter explanation, the tool is incompletely specified. The description does not clarify what the tool returns (e.g., a PDF file, data fields) or how the payment/credentials work operationally. The annotations cover read-only and idempotency, but the overall context is insufficient for an agent to use this tool reliably.

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 provides no explanation for any of the 11 parameters. Parameters like 'a3', 'a3_pin', and 'numero_espelho' remain cryptic with no additional meaning. The description does not compensate for the lack of schema documentation, leaving the agent unable to correctly fill the required fields.

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 states 'Baixar Veículo, consulta em fonte oficial' (Download Vehicle, query in official source), giving a general sense of querying vehicle data. However, it's vague about the exact operation (whether it downloads a PDF or returns data) and doesn't clearly distinguish from any alternatives, though sibling tools are unrelated. The purpose is not a tautology but lacks precision.

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 is provided on when to use this tool versus alternatives. The description mentions it queries official Brazilian sources and is paid, but it does not state specific use cases, prerequisites, or exclusions. There are no similar vehicle-query tools among siblings, so situational guidance is absent.

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