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

The annotations already declare readOnly, idempotent, non-destructive and closed-world behavior, so the safety burden is mostly covered. The description adds genuinely useful context beyond the annotations: it says the average rating is 'pra situar, não pra comparar' and that the result includes links, which matters because there is no output schema.

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?

One front-loaded sentence that lists the returned fields, followed by a two-word English gloss. Every clause carries information, and the bilingual repetition is warranted by the lingua parameter.

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 two-parameter, annotation-covered, output-schema-less read tool, the description covers what an agent needs: the returned fields and links, plus a caveat on interpreting the score. Only the behavior for an unknown winery and the effect of lingua on output are left unstated.

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 coverage is 100%: both parameters, including the lingua enum and its default, are documented in the schema. The description adds nothing about the nome format (name vs. slug) or how lingua affects the links, so the baseline of 3 applies.

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 names a specific resource (a winery page) and enumerates its contents: country, region, number of labels, average rating, Wikidata data (founding, website) and top-rated wines with links. That contrasts implicitly with ficha_do_vinho and verbete, though it never names a sibling explicitly.

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 explicit when-to-use or when-not-to-use statement and no alternative is named. The rare field list lets an agent infer that this is for a winery-level overview rather than a single wine, but the choice among siblings is left to inference.

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