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

Beyond the idempotent/readOnly annotations, the description discloses critical behavioral details: it is a paid service (prepaid credit), it does not require platform credentials, and it includes LGPD data-controller responsibility. It also clarifies that the data is not confidential, adding transparency 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 a short paragraph, but it contains slight redundancy, repeating the 'official source' concept. Overall, it is efficient and avoids unnecessary length, though it could be tightened by removing repetitive phrases.

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 provides context about data sensitivity, LGPD, payment, and source, but it lacks information on parameter usage and any specific constraints (e.g., required fields, formatting). For a read-only query tool, the description is adequate but not exhaustive, leaving some gaps for the user.

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 schema has seven parameters (ie, cpf, cnpj, login_cpf, login_senha, pkcs12_cert, pkcs12_pass) with zero description coverage. The description does not explain any of these fields, their format, or which are required. The parameter names are suggestive but the description adds no clarification, failing to compensate for the lack of schema descriptions.

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 for a negative debt certificate (Certidão Negativa de Débitos) from SEFAZ PE, an official source. It distinguishes itself from generic sibling tools like 'authenticate' or 'connect' by specifying the exact resource and action.

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 provides usage context: it is hosted by the platform, requires no platform credentials, and is paid per query with prepaid credit. It also clarifies that it queries official non-confidential data, giving the user a clear picture of when to use it, though it does not explicitly contrast with alternatives.

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