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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint=false, so the safety profile is covered. The description adds value by listing the returned components (van_score, sleep_score, solar yield, driving conditions, awning safety, condensation risk, 7-day forecast), which matters since no output schema exists, but it says nothing about data freshness, forecast caching, or failure behavior.

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?

A single front-loaded sentence that leads with the verb and resource before the parenthetical scale and the return-field list. Dense but every item carries information; nothing is padding.

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 one simple parameter, full annotations and no output schema, the description covers purpose and enumerates the return payload, which is the main gap the absent output schema leaves. It is nearly sufficient, missing only freshness or error context.

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?

Only one parameter exists and schema coverage is 100%, with the schema documenting the ISO 3166-1 alpha-2 format and an example. The phrase 'for a country' merely restates what the schema already says, so the baseline of 3 is correct.

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?

States a specific verb (Get) and resource (VanSky vanlife weather suitability score) with the 0-100 scale, and enumerates what the score comprises. It is distinguishable from all siblings, which cover fuel, visas, plates and events, though it never explicitly names a contrasting tool because none exists.

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 statement of when to call this versus another tool, no prerequisites, and no exclusions. The country-scoped purpose is inferable from 'for a country', but the agent gets no routing guidance at all.

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