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

Annotations already cover readOnlyHint, idempotentHint, destructiveHint, and openWorldHint. The description adds only the domain scope ('used in Yugalinks commerce data'), which is useful but does not disclose behaviors like matching semantics, ordering, or pagination.

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 short, front-loaded sentence with no filler. It delivers the core purpose immediately and does not waste tokens.

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 simple, safe lookup tool with no required parameters, robust annotations, and an output schema, the description is nearly complete. The main missing piece is explicit usage guidance, but that is covered under a separate dimension.

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 schema already documents q, limit, and country_iso3 to a reasonable degree. The description's mention of country names and ISO3 codes provides mild semantic context, but it does not clarify what q filters against or how country_iso3 interacts with q.

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 states a specific verb ('Find') and a specific resource ('country names and ISO3 codes used in Yugalinks commerce data'). It is clear, though it does not explicitly contrast itself with sibling tools like get_country_trade.

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 on when to use this tool versus alternatives, no prerequisites, and no when-not conditions. An agent must infer from the tool name and sibling names that this is a lookup helper for country codes.

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