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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, and the description adds beyond that: no platform credentials, prepaid per-query billing, non-confidential official data, and LGPD data controller responsibility. This is useful behavioral context not present in 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 compact and front-loaded with the main purpose, followed by brief billing and legal context. It is not overly verbose, though the LGPD sentence adds only governance context rather than operational detail.

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 eight parameters, no output schema, and no parameter descriptions, this tool needs a richer description to be complete. The description covers official data source and payment model but omits parameter meanings, return values, and error/edge-case behavior.

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%, so the description must compensate, but it does not. None of the eight parameters (rg, cnh, nome, birthdate, login_cpf, login_senha, pkcs12_cert, pkcs12_pass) are explained, and 'sem credenciais da plataforma' even creates ambiguity about the optional credential parameters.

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 'DETRAN RS: CNH, consulta em fonte oficial', clearly specifying the resource (CNH from DETRAN RS) and the action (query). It also distinguishes the tool from generic sibling tools like authenticate, connect, and marketplace by naming a concrete official data source.

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 implies usage context: query official Brazilian CNH data, pay per query with prepaid credit, and no platform credentials are needed. However, it never explicitly states when to use this tool versus alternatives or mentions any exclusions.

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