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

Annotations already indicate readOnlyHint=true, idempotentHint=true, and destructiveHint=false. The description adds useful behavioral context beyond that: it is a public/official-base query, and it enumerates the returned fields. It does not cover pagination or failure behavior, but the read-only safety profile is already disclosed by annotations and reinforced by the description.

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 three short sentences, front-loaded with the main purpose, followed by return contents and access context. Every sentence earns its place and there is no redundant or filler wording.

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 description gives a solid overview, lists returned fields, and benefits from read-only annotations in the absence of an output schema. However, it is incomplete as a standalone guide because required TIPO and optional completo are not explained, and there is no explicit guidance on how this tool differs from the closely related multas sibling tools.

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 schema has no parameter descriptions or enums. The description meaningfully explains PLACA and RENAVAM ('por placa + RENAVAM'), but it leaves the required TIPO parameter completely unexplained and does not describe the optional completo boolean. This is a significant semantic gap for a tool with sparse schema metadata.

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 specifies a public query for federal-highway traffic fines (PRF) by plate + RENAVAM, listing returned data such as notice, location, date, value, and status. This distinguishes it from sibling multas tools by naming the federal-highway/PRF scope and the required identifiers.

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?

It provides clear context: use for public consultation of federal highway fines when plate and RENAVAM are available, and it notes access is public/official and intended for vehicle owners. However, it does not explicitly state when not to use it or compare it with sibling tools like multas_historico_veiculo or multas_debitos_veiculo.

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