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

Annotations already indicate read-only, idempotent, non-destructive. Description adds that it is paid via pre-paid credits Hierarchical, and clarifies data custody and LGPD responsibilities, which are extra behavioral/contextual cues. However, it doesn't detail authentication specifics (like needing certain credentials) or potential errors, but given existing annotations, a 3 is fair.

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?

Description is a single, dense paragraph but concise (~400 characters) and front-loads the primary purpose. It includes necessary compliance and hosting issues. Each sentence has purpose: purpose, hosting/platform context, data source explanation, LGPD warning. No fluff.

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?

Complexity is moderate (6 params, of which 4 optional auth-related). Output schema missing, so description should cover expected return. It does not explain return format or error handling. But given annotations (read-only, idempotent), and that it's a standard query tool, the description is fairly complete for a casual user; yet it lacks param details. Thus a 3.

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 description must compensate. The description lists only hints that 'placa' and 'renavam' are likely vehicle identifiers but doesn't explain optional parameters like login_cpf, senha, or certificates. It does state the tool uses official source and payment, but that's not about parameter semantics. With zero schema coverage service, the description falls short of giving meaningful parameter guidance, earning a 3.

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 states the tool queries debts/charges from DETRAN DF, an official Brazilian source (verb 'consultar' = consult, resource='débitos' = debts). It distinguishes itself from siblings by specifying the official DETRAN DF scopeasia, but does not explicitly compare to other sibling tools, yielding a slight deduction.

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 implicitly tells when to use: for consulting debts from official Brazilian sources, with a note that it is not confidential data. It does not explicitly state when NOT to use or name alternative tools, but the context (official source) illuminates appropriate use. Sibling tools are mostly support/misc, so it's clear this is a data lookup.

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