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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds real value beyond that: it flags the endpoint as experimental and warns that scores must not be read as shutdown-onset timing, which is substantive behavioral context for an opaque risk score.

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?

Two short sentences with no filler, and the core purpose is front-loaded. The phrasing is slightly telegraphic ('single-call experimental'), but nothing is wasted.

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, the description leaves the return shape entirely unspecified: no indication of what a ranking looks like, how many countries, or what fields accompany each score. For a low-complexity read tool the gap is tolerable but not filled.

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 a single parameter with 100% schema description coverage ('Minimum risk filter 0-1 (default 0)'), so the schema carries the full semantics. The description adds no range, default, or filtering detail beyond that, 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?

Names a specific resource (country risk ranking) and a distinct implementation trait (single-call). It stops short of differentiating from close siblings such as get_high_risk_countries or get_atlas_score, so an agent cannot route between them from the text alone.

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 when-to-use statement and no named alternative among the many risk-rating siblings. The caveat about shutdown-onset timing is a limitation on interpretation, not usage guidance, so the agent gets no basis for choosing this over get_shutdown_risk or get_high_risk_countries.

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