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

The annotations already declare readOnlyHint, idempotentHint, and destructiveHint, and the description does not contradict them. It adds the context that this is a SINTEGRA registration-status lookup, but it does not disclose runtime behavior such as authentication needs, invalid input behavior, or what exact statuses are returned.

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 single compact sentence that puts the key information upfront: domain, state, and input type. It contains no filler and every word contributes meaning.

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 read-only query tool with two simple string parameters and good annotations, the description is mostly sufficient: it names the purpose, the geographic scope, and the supported identifiers. There is no output schema and the response structure is not described, so it is not fully complete for an unfamiliar caller.

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 description coverage is 0%, so the description carries the burden of explaining the parameters. It only repeats the property names by saying 'por CNPJ ou CPF' and does not clarify formats, constraints, or whether at least one identifier is required; the schema marks both as optional, leaving ambiguity.

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 identifies the resource: ICMS SINTEGRA registration status for the state of RJ, queried by CNPJ or CPF. It distinguishes itself from SINTEGRA sibling tools by the explicit 'estado do RJ' scope, though it lacks a direct verb such as 'consulta' or 'obtém'.

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 scope 'no estado do RJ' and the query parameters 'por CNPJ ou CPF' imply when the tool is useful, and the sibling names suggest state-based alternatives. However, the description does not explicitly say when not to use it, mention alternatives by name, or list prerequisites.

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