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

Beyond the readOnlyHint and idempotentHint annotations, the description adds important behavior: it is a paid query (pague por consulta), requires external credentials (sem credenciais da plataforma), and clarifies the data is not confidential and falls under LGPD responsibilities. This enriches the operational context without contradicting annotations.

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 reasonably concise and front-loaded with the purpose. Some content, such as the LGPD compliance sentence, is extra but still relevant for a legal context. Each sentence contributes to understanding the tool's nature and constraints.

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?

Even with annotations, the description does not explain how to use the parameters or what the output looks like. With five parameters and no output schema, the description leaves significant gaps that could prevent correct invocation, especially for an AI agent.

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 the five parameters (renavam, login_cpf, login_senha, pkcs12_cert, pkcs12_pass). It only hints that platform credentials are not used, implying external login/PKCS12, but does not map these to specific schema fields or indicate which are needed.

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 the tool performs a query (consulta) for DER SP penalties from official sources. This clearly specifies the verb and resource, and it is distinct from the sibling tools which are platform utilities like authenticate 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 provides clear context: it is an official source query, requires prepaid credit, and does not use platform credentials. However, it does not explicitly state when to use this tool over alternatives or when not to use it, though no similar query siblings exist.

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