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

Annotations already establish readOnlyHint=true and openWorldHint=false, but the description adds genuinely useful scope: per-size availability, seller legal name and country, and country-specific shipping lead times and warranty terms. It does not mention the not_open failure mode for unopened countries, which the schema does carry.

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 resource first and then enumerates contents; the list is long but each item earns its place by describing a distinct part of the returned record. No filler or repetition.

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?

With an output schema present and full schema coverage, the description needn't explain return values or parameters, and it doesn't need to. What is still missing for a read tool in this sibling set is selection guidance against search_products, check_availability, and especially shipping_and_returns, which the description's content overlaps without addressing.

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%, so both product_id and country are already documented in full, including the ISO code format and the open-market list. The description only hints at country relevance via 'envío y plazo al país' and adds no format or defaulting semantics of its own, 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?

Enumerates the specific content of the resource (descripción, composición, tallas con disponibilidad, fotos, vendedor, envío, devoluciones, garantía), so the agent knows exactly what a call yields. It is a noun phrase rather than a verb and never names how it differs from search_products or shipping_and_returns, so it stops short of a 5.

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 when-to-use or when-not-to-use guidance, and no alternative is named, even though shipping_and_returns overlaps with the envío/devoluciones content it advertises. The only routing hint (product_id comes from search_products) lives in the schema, not the description.

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