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

Annotations already declare readOnlyHint=true, so the safety profile is covered. The description usefully discloses that the response includes mileage and tire-pressure logs, which is real behavioral context, but says nothing about auth requirements, error behavior for missing ids, or response shape beyond those two log types.

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, front-loaded with the action and payload before the API reference. Every clause earns its place with no redundancy.

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 single-parameter read-only getter with no output schema and full annotation coverage, the description is nearly sufficient: the agent knows the input and the notable contents. It could mention error/not-found behavior, but nothing essential to correct invocation 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% and there is a single parameter documented as 'The vehicle id.', so the schema carries the semantics. The description's 'by id' adds nothing beyond that; baseline 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 (fetch), resource (a single vehicle), and selection key (by id), plus the notable extra payload (mileage and tire-pressure logs). This clearly distinguishes it from shopmonkey_create_vehicle and shopmonkey_list_customer_vehicles without opening either schema.

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 only implied: the tool requires a vehicleId, so an agent infers it is used when an id is already known. There is no explicit guidance about when to prefer this over shopmonkey_list_customer_vehicles when starting from a customer, and no exclusions or prerequisites are stated.

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