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

The annotations already declare readOnlyHint=true and destructiveHint=false; the description adds genuine behavioral context around prepaid-cost-per-query, credential source expectations, and LGPD responsibility. It does not detail edge behaviors like failed payment, throttling, or response failures, but it does explain what matters most beyond the 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 three sentences and front-loads the core purpose, followed by cost, credential, and legal context. Each sentence earns its place, and there is no fluff, though the legal wording makes the first two sentences feel dense.

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?

For a simple three-string query tool, the description covers the important operational context: what it queries, who provides the data, cost, credentials, and legal responsibility. However, there is no mention of the output shape, possible response formats, or the exact role of the required login parameters, which leaves gaps in an otherwise helpful tool definition.

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?

The input schema has 0% description coverage, so the description must compensate, but it does not explain placa, login_usuario, or login_senha individually. The parameter names are partially self-explanatory, but the description neither specifies the accepted format for placa nor clarifies whose credentials login_usuario/login_senha refer to beyond saying 'no platform credentials'.

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 a specific resource ('Laudos Veiculares DEKRA: ECV') and a specific verb ('consulta'), clearly identifying this as a query tool for DEKRA vehicle inspection reports from an official source. It also distinguishes itself from sibling tools like authenticate/connect/marketplace, which are unrelated platform operations.

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 relevant usage context: it consults official Brazilian sources, requires no platform credentials, is paid via prepaid credit, and returns non-confidential citizen-accessible data. It does not explicitly state 'when not to use' this tool, nor does it name alternative vehicle-report tools, so it falls just short of fully explicit guidance.

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