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

Annotations already declare readOnlyHint=false, destructiveHint=false and openWorldHint=false, so the agent knows this is a non-destructive, closed-world write. The description adds no behavior beyond that — it does not mention optional signing/transmission, certificate requirements, or what the generation produces (all carried by the schema instead). Adequate only because annotations lower the bar.

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?

A single front-loaded sentence that identifies the artifact and its regulatory trigger with no filler or redundancy.

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?

There is no output schema, yet the description never says what is returned (generated file reference, bytes, status) or that output can be signed and transmitted via TED. The regulatory purpose is well stated, but return behavior and the transmit path remain undocumented in prose.

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 100%: Ncm, Gtin, ValorSaida, ValorImportado/PercentualImportado mutual requirement, and the Transmitir/ValidarCodigos semantics are all documented in the schema. The description adds nothing about parameters, so it sits at the baseline 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 states a specific verb ('Gera') and resource ('arquivo FCI') and even expands the acronym (Ficha de Conteúdo de Importação), so the agent knows exactly what artifact is produced and for what domain. No sibling tool covers FCI, so differentiation is implicit, but it does not explicitly contrast with any sibling.

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?

It supplies the business condition that triggers use ('requerido para produtos com conteúdo importado em operações interestaduais'), which is genuine implied usage guidance. However, it gives no explicit when-to-use/when-not-to-use instruction and names no alternative or prerequisite workflow.

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