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

Annotations already cover safety (readOnlyHint, idempotentHint, openWorldHint), so the description's job is added context, and it delivers: it discloses that the score is a heuristic rather than an official rating, specifies upstream sources and their licenses, and flags a safety limitation ('not for life-safety use'). That is meaningful disclosure beyond the structured fields; it does not cover result ordering or scoring methodology details, keeping it at 4.

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 usage sentence is front-loaded and efficient, but the remainder is a dense licensing/attribution block with repeated 'not an official rating' phrasing already stated in the first sentence. Attribution text is legally necessary, yet its length relative to the functional content and the duplication cost it on conciseness.

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 carries the burden of describing returns, and it does list the key fields (advisory level, incident counts, weighted components) plus the source basis. What is missing is finer detail such as ordering of the ranked list or what the weighted components look like in the payload, but for a three-parameter read-only heuristic tool it is largely 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?

Schema coverage is 100%, so all three parameters are already documented in the schema, including ranges and defaults. The description adds only the list-vs-single-country framing ('list or one ISO2 country'), which the schema's country/limit descriptions already convey. 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 names a specific resource (heuristic country-risk score) and explicitly states both modes of operation: a ranked list or a single ISO2 country profile. It also enumerates what is returned (advisory level, recent incident counts, weighted components) and adds a distinguishing qualifier, 'not an official rating', which separates it from official-advisory siblings such as get_travel_advisories. It stops short of naming those siblings outright.

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 opening clause is genuine when-to-use guidance ('Use this when you need a transparent heuristic country-risk score'), and the 'not an official rating' / 'not for life-safety use' caveats imply when NOT to rely on it. There is no explicit routing to an alternative tool for official ratings, so it falls short of a 5.

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