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

Annotations already declare readOnlyHint=true, so the safe-read profile is covered. The description adds the underlying endpoint and the fields that come back, which is meaningful since there is no output schema, but it says nothing about pagination behavior or result ordering beyond what the schema's skip/limit already imply.

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 tight sentences with the core purpose front-loaded and the API mapping trailing as supporting detail; nothing is wasted.

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 list tool, the description covers purpose, scope, and return fields, and the schema covers paging. No output schema exists, so the field enumeration helps, though paging/result-size expectations could be stated more explicitly.

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%, with skip, limit, and customerId all documented in the schema. The description only alludes to the customer scoping and adds no format or syntax detail beyond what the schema provides, so 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 (list) and resource (vehicles) with the scoping relation (owned by a customer), and enumerates the returned fields (year/make/model, VIN, plate, mileage). This clearly separates it from the singular shopmonkey_get_vehicle and the write-path shopmonkey_create_vehicle.

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?

Usage is implied by 'owned by a customer', so an agent can infer this is the per-customer vehicle listing, but there is no explicit when-to-use guidance or naming of alternatives such as shopmonkey_get_vehicle for a single vehicle.

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