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

No annotations are provided, so the description carries the full burden. It only says this is a World Bank country profile lookup; it does not disclose failure behavior for invalid or empty codes, whether the lookup is live, or whether any rate limits or authorization constraints apply. There is no contradiction, but behavioral value is minimal.

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 compact phrase with no filler, and it front-loads the source and lookup key. It is concise and scannable, though it is a noun phrase rather than a complete instructive sentence.

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 one-parameter lookup with an output schema available, the description conveys the core source and key. It is not fully complete because it omits the accepted ISO code format, the meaning of the default q value, and any routing guidance, but the tool is simple enough that these gaps are limited.

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 has one parameter, q, with zero description coverage and a default of empty string. The description's phrase 'by ISO code' suggests q is an ISO country code, which adds some meaning, but it does not specify whether that means ISO 3166-1 alpha-2, alpha-3, numeric, or how case and invalid values are handled.

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 identifies a specific resource (World Bank country profile) and lookup key (ISO code), so an agent can infer this is a country-profile retrieval tool. It lacks an explicit verb like 'get' or 'fetch', but the World Bank source helps distinguish it from sibling tools such as restcountry.

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. A sibling tool named restcountry exists, but the description never explains the difference or the conditions under which an agent should choose Country instead.

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