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

Annotations already disclose openWorldHint=true and idempotentHint=false; the description adds the crucial business context they do not carry: the EUR 1.95 incl. VAT cost, the payment providers (iDEAL/card via Dodo Payments), and that the payload is a payment link rather than the report itself. It could go further on whether the link is single-use or time-limited, but the concrete financial behavior is well disclosed.

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 sentences, front-loaded with the return value and cost, then the usage condition. The report-contents enumeration is long but arguably earns its place by telling the agent what the purchase actually delivers.

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 must explain the return value — and it does, specifying a secure payment link. The single required parameter is fully covered by the schema, so nothing needed to invoke this tool correctly is missing.

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 description coverage is 100% for the single licence_plate parameter, and its format example is already in the schema. The description adds no format, normalization, or validation detail beyond that, so the baseline of 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?

States a specific verb and resource — returns a payment link for the full vehicle report — and enumerates the report contents (APK history, defects, recalls, import/taxi/export history, specs). This clearly distinguishes it from the sibling report/spec tools such as nl_vehicle_report and nl_vehicle_basic.

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?

"Only use when the user wants the full report or asks to buy it" gives explicit activation criteria, which matters for a paid tool. It stops short of naming the free/alternative sibling (e.g. nl_vehicle_report) as the fallback when the user does not want to pay.

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