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

Annotations already establish read-only, idempotent, closed-world and non-destructive behavior, so the description only needs to add context — and it does, disclosing the fixed scope (54 countries), the payload fields, and the three-state coverage vocabulary an agent must interpret. It stops short of describing ordering or output shape, which is minor for a static reference list.

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 sentence, front-loaded with the verb and the scope, followed by the return contents and the coverage vocabulary. No filler, no restatement of the title.

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 no output schema and no parameters, the description carries the burden of explaining the return value, and it does name the key fields and status values. A brief note on how the coverage statuses should be acted on would make it fully self-sufficient.

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?

Zero parameters, so there is nothing to disambiguate; the baseline of 4 applies. The description correctly implies the call is argument-free.

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?

Specific verb ('List') plus a precise resource ('the 54 African countries covered') and the fields returned (currency, per-feature coverage status). It implicitly separates itself from get_country_profile (one country) by scoping to the full covered set, but never names the 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?

The phrase 'covered' and the ready/partial/gap taxonomy imply this is a discovery/pre-flight call before drilling into a country, but there is no explicit when-to-use statement and no mention of get_country_profile as the follow-up alternative among 19 siblings.

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