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

No annotations are provided, so the description carries full responsibility for behavioral disclosure. It only states that the tool lists markets, implying a read-only operation, but does not disclose output format, ordering, filtering, or any side effects. For a no-parameter tool this is minimal disclosure.

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 concise sentence, front-loading the action 'Lista' followed by the object. It contains no redundant or extraneous information, and the location qualifier adds useful context.

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 tool is simple (no parameters) and the description includes the program and geographical scope, which is helpful. However, with no output schema, the description does not indicate what the returned market entries look like (names, objects, ordering). For a list tool, this is a notable gap, though not severe for a no-arg call.

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 parameters, so there are no parameter descriptions to assess. Per the rubric, a tool with 0 parameters gets a baseline of 4; the description doesn't need to compensate for missing parameter docs.

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's purpose: listing the markets tracked by Menor Preço Hoje in Lages, SC. The verb 'Lista' identifies the action and the resource 'mercados' is specific. It is distinguishable from the siblings, which focus on offers/prices, though it doesn't explicitly name them.

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?

No guidance is given on when to use this tool versus alternatives like search_offers or top_offers. The description only states what the tool does, not its intended usage context or exclusions. An agent must infer that market listing is different from offer pricing.

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