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 discloses that the output is counts by category, which is valuable. However, it does not mention data coverage, potential limitations, or whether the operation has any side effects (though it is clearly a read-only lookup).

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, well-structured sentence that immediately conveys the tool's purpose without unnecessary words. It is appropriately sized and front-loaded.

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?

The tool is simple with one parameter, and an output schema exists, reducing the need for return-value explanation. However, the description leaves gaps: no param format, no usage guidance, and no differentiation from the sibling visa_check tool. It is adequate but not fully complete.

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 'passport' with no description (0% schema coverage). The description adds that it refers to a 'passport country,' which clarifies its meaning, but it does not specify the accepted format (e.g., country name, ISO code) or provide examples. With no schema coverage, the description should compensate more.

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 clearly states the tool's function: providing an overview of visa-free access for a passport country with counts by category. It uses specific phrasing like 'Overview of visa-free access' and 'counts by category,' which makes the purpose evident. It does not explicitly distinguish from sibling tools like visa_check, but the 'summary' scope implies a different use case.

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. The sibling list includes visa_check, which likely handles specific visa checks, but the description does not mention situational advice, prerequisites, or when to avoid using this tool.

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