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

readOnlyHint=true already tells the agent this is a safe read. The description adds that the endpoint is a paginated GET listing and that returned class ids feed pricing, which is genuinely useful downstream context, but it says nothing about pagination limits, total counts, or how many results come back by default.

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?

Three short sentences, front-loaded with purpose and examples before the incidental endpoint path. Tight and readable, though the raw GET path is arguably redundant for an agent that never constructs URLs itself.

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 simple read-only lookup with a fully documented three-parameter schema and no output schema, the description covers what it is, what it returns (class ids), and why they matter. Only the relation to limoexpress_list_vehicles and pagination behavior remain unaddressed, both minor here.

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% — page, per_page, and search_string are all documented in the schema with bounds. The description contributes no additional parameter meaning (e.g. that search_string matches class names specifically), so the schema does all the work and 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 ('List vehicle classes') and grounds it with concrete examples (sedan, van), plus explains that class ids are the key consumed by pricing. It does not explicitly distinguish itself from the nearby limoexpress_list_vehicles sibling, which an agent could plausibly confuse with it.

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?

The line 'Class ids are used for pricing' implies the tool should be called before the pricing siblings (limoexpress_get_pricing, limoexpress_get_extra_fees_pricing), but this connection is left for the agent to infer. No explicit when-to-use, when-not-to-use, or named alternative is given.

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