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

With no annotations available, the description carries the full burden of behavioral disclosure, but 'Preços e tetos' reveals nothing about side effects, authentication requirements, response behavior, or whether this is a read-only operation. No behavioral trait is actually disclosed.

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 phrase is undeniably short, but it is under-specified rather than efficiently complete. It has no verb, no object action, and no useful structure to help an agent route to or invoke the tool.

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?

Even for a zero-parameter tool, the description does not explain what the caller will receive, such as a price list, cap values, or an availability status. Since there is no output schema and no annotations, the agent has almost no context to judge whether this tool satisfies a user request.

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 input schema has zero properties and full description coverage, so there are no parameters whose meaning the description must clarify. This matches the zero-parameter baseline; the description is consistent with the empty schema.

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, 'Preços e tetos' ('Prices and ceilings'), identifies a subject area but never states an action or resource operation. It does not say what the tool does with prices, such as returning, listing, or calculating them, and it does not distinguish billing from 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?

There is no guidance about when to call this tool versus alternatives. It gives no triggering condition, no exclusions, and no mention of sibling tools that might overlap with billing or pricing.

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