v1country

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

With no annotations provided, the description carries full burden for behavioral disclosure but provides none. It does not indicate this is a read-only search operation, does not describe return format, pagination behavior, rate limits, or whether filters use AND/OR logic.

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 brief (6 words), avoiding verbosity, but the single sentence fails to earn its place by providing actionable information. It is appropriately sized in length but inadequately sized for the tool's complexity.

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 tool with 19 filter parameters and no output schema, the description is grossly incomplete. It fails to explain return values, query semantics, or the relationship between min/max parameter pairs, leaving the agent without sufficient context to invoke the tool effectively.

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?

Schema description coverage is 100%, establishing a baseline score. However, the description adds no value beyond the schema—no explanation of query composition (e.g., whether name and currency can be combined), valid value formats beyond what's in schema, or examples of common use cases.

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 'API Ninjas Country API endpoint' identifies the provider and domain (country) but fails to specify the action (retrieve, search, list). It essentially restates the tool name with provider context, functioning as a tautology without clarifying what operation is performed.

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 provided on when to use this tool versus alternatives, or how to construct valid queries from the 19 available parameters. With zero required parameters, the description offers no hints about minimum viable query patterns.

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