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

The readOnlyHint=true annotation already establishes this is a safe read, so the description is not carrying the full burden. It contributes the endpoint path but says nothing about what the fee structure contains, whether fees can be conditional, or what happens if a currency/vehicle-class combination has no fees configured.

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 short sentences with the purpose front-loaded and no filler prose. The raw REST path adds little for an agent already given a structured tool definition, which keeps it just short of a 5.

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 two-required-parameter read tool with a clean schema and a readOnly annotation, the essentials are covered. However, with no output schema, the description should have indicated what the returned extra-fee pricing looks like, and it offers nothing on that front.

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 both parameters are already documented as UUIDs sourced from list tools. The description only restates that the two inputs are a currency and a vehicle class, adding no format or edge-case detail beyond the schema — the 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?

States a specific verb and resource with precise scope: 'Get the extra fees for one vehicle class and currency.' This is clearly a narrower pricing lookup than the sibling limoexpress_get_pricing, though the description never names that sibling to make the distinction explicit.

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 mention of when this is preferable to limoexpress_get_pricing, and no stated prerequisites. The only implicit hint is that it operates on a single currency/vehicle-class pair, which the agent has to infer from the wording.

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