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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds that the link opens a simulator where the user adjusts the print and pays on the site, giving useful downstream context, but it omits URL lifetime, what exactly is returned, and any limits or side effects.

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?

Two short sentences with little wasted text. The second sentence is user-journey context rather than invocation detail, so the description is not maximally front-loaded for an agent, but it is still concise.

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 tool with no output schema, a nested input object and low schema coverage, the definition is thin. It never states that the tool returns a URL, whether the link expires or is single-use, or how the size-quantity object should be shaped, leaving too much for the agent to infer.

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 only 25%, so the description needs to compensate. It loosely names modelo, cor, tamanhos and frase, but does not explain the nested quantidade_por_tamanho map, that only modelo is required, the allowed enum values, or the frase max length, so it adds little beyond property 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?

States that the tool produces a simulator link pre-filled with model, color, sizes and phrase, so the resource is identifiable. However, it is a noun phrase rather than a clear verb-led action, and it does not distinguish the tool from siblings like fechar_compra or calcular_preco.

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?

Provides no explicit when-to-use or when-not-to-use guidance. It describes a downstream user flow (adjust print, preview, pay on site) but does not say whether this should be called before fechar_compra, instead of calcular_preco, or under what conditions.

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