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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the description's added value is the data-provenance disclosure: each value carries official sources and the date Roadcut last verified it. The European-only coverage is a useful scope constraint not stated in annotations, but nothing is said about behavior for unsupported countries.

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 enumerates the payload and ends with the provenance detail. No filler, nothing that repeats the schema.

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 only two fully documented parameters and no output schema, the description carries the burden of describing return content, and it does so concretely. The remaining gap is what happens when a non-European or unrecognized country is supplied.

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%, with country format ('Austria' or 'AT') and the lang enum already documented in the schema. The description adds no parameter-level detail, so baseline 3 applies.

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 the exact resource and enumerates the returned policy facts (speed limits, drink-driving limit, winter tyre/stud/chain rules) plus attribution and freshness metadata. Its domain is unmistakably distinct from find_road_trips, get_road_trip and get_mountain_pass, though it never explicitly says so.

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?

Scope is implied by 'for a European country', which tells the agent the tool is region-bounded, but there is no explicit when-to-use or when-not-to-use guidance and no routing to siblings. An agent can infer usage from the content list alone.

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