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

Annotations already cover the safety profile (readOnlyHint=true, destructiveHint=false, openWorldHint=true), so the description is not the sole source of behavior. The word 'Indicative' does add real value by signaling the price is an estimate rather than a binding quote, but nothing is said about required permissions, rate limits, or pricing inputs.

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 with zero padding — the purpose and mode appear immediately. It is efficient, though its brevity is arguably the product of under-specification rather than disciplined writing.

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?

For a 9-parameter tool with 4 required fields, enum subtypes for truck/bus/trailer, and an excluded 'enginePowerKw vs engineCapacity' choice, one sentence is far too thin, especially since there is no output schema to explain the returned estimate and no usage 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?

Schema description coverage is only 67%, so a third of the parameters (e.g. termMonths, vehicleKind, vehicleYear) rely on the schema alone, and several conditional rules live only in schema text. The description contributes nothing about parameters, so it does not compensate for the coverage gap.

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 (Ukrainian motor insurance prices) and a specific mode (from manual vehicle details), so an agent can identify the operation. However, it never distinguishes OSCPV from the sibling get_green_card_price, leaving the agent to infer which insurance product applies — a gap for a domain where those are different products.

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 guidance, no prerequisites, and no mention of alternatives. 'From manual vehicle details' faintly implies data is entered by hand rather than looked up, but no tool or condition is named, so the agent gets no routing help.

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