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

Even though annotations already declare readOnlyHint=true and destructiveHint=false, the description adds substantial behavioral context: it is hosted by the platform, requires no credentials, is paid via prepaid credit, consults only public official data, and includes LGPD compliance notes. This goes beyond the annotations and clarifies the operational and legal boundaries.

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 at three sentences, front-loaded with the core action and purpose. The second sentence adds operational details (hosting, payment, credentials), and the third a legal disclaimer. While the LGPD note is relevant, it is slightly tangential but does not bloat the description excessively.

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?

Given the tool's narrow scope and helpful annotations, the description covers the consultation action, the data source, the public nature, and the expected outcome (registration confirmation). However, it lacks any detail on the behavior of the 'completo' parameter and possible response/error scenarios, so it is not fully complete.

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 coverage is 0%, so the description must compensate for parameter meaning. It names RNTRC and RENAVAM as the lookup keys but does not define them or explain accepted formats/constraints. The optional 'completo' parameter is entirely omitted, leaving its purpose unclear. The description adds minimal value beyond the parameter names.

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 consults the registration of a road freight transport operation at ANTT using RNTRC and RENAVAM, and confirms whether the operation is registered. This specific verb+resource combination, with distinct identifiers, clearly differentiates it from the unrelated sibling tools.

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 when a user needs to verify an ANTT cargo transport operation via RNTRC/RENAVAM. It provides context about the paid, credential-free nature and public data access, though it does not explicitly mention alternatives or exclusions. Since no sibling tool serves a similar purpose, this is adequate.

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