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

Annotations already establish read-only and non-open-world behavior, and the description adds important data-quality context: the national blocklist field is null because that layer is under review and being rebuilt. This is genuinely useful transparency beyond the annotations, though it does not describe broader return behavior.

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 front-loaded and efficient: the first sentence states what the profile contains, and the second explains the null blocklist field. The second sentence is somewhat long, but its detail earns its place by clarifying a non-obvious data caveat.

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 one-parameter profile tool without an output schema, the description sufficiently lists the main returned areas and explains the notable null field. It does not fully describe the return object shape, but it gives enough context for correct invocation.

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?

There is only one parameter and schema coverage is 100%, so the schema already explains country_code with ISO examples. The description adds little beyond confirming that the profile is for one country, making the baseline 3 appropriate.

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 country measurement profile, and enumerates its main contents: data freshness, measurement volume, and technique mix. It is distinguishable from broader siblings by profile scope, but it does not explicitly position itself against country_brief, get_country_status, or get_national_blocklist.

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 description does not say when an agent should choose this tool over alternatives, nor does it provide exclusions or prerequisites. Usage is only implied by the term profile.

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