Country overview

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

No annotations are provided, so the description must fully convey behavioral traits. It lists returned data but does not disclose whether the operation is read-only, any rate limits, authentication requirements, or side effects. This leaves the agent uncertain about safety and constraints.

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, front-loaded sentence that efficiently communicates the tool's purpose and outputs. Every element earns its place with no redundant or vague wording.

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?

Despite lacking an output schema, the description lists the major return dimensions (visa pathways, EU status, score dimensions, drawbacks, cities with rents, PR/citizenship timelines). This provides sufficient context for an overview tool, though structural details (e.g., JSON format) are omitted.

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 coverage is 100% and the single parameter (country_code) is well-documented in the schema, including a reference to the countries resource for available codes. The description adds no additional semantic value beyond what the schema provides, so baseline 3 is 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 clearly states the tool's purpose: 'Get summary data for a destination country' and enumerates specific data points (visa pathways, EU status, score dimensions, drawbacks, top cities with rent ranges, PR/citizenship timelines). This distinguishes it from sibling tools that focus on visas, matching, or search.

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 implies usage when a country overview is needed, but provides no explicit guidance on when to use this tool versus alternatives (e.g., transita_visa_details for specific visa info). No when-not-to-use or prerequisite context is given.

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