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

Annotations only supply destructiveHint=true; the description does not disclose whether a duplicate VIN is rejected, what the response contains (e.g. the new vehicle id), required permissions, or side effects on the linked customer record. The 'POST /v3/vehicle' note is an implementation detail rather than behavioral context.

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; the trailing HTTP endpoint reference adds little for an agent and is the only mild waste.

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 15-parameter mutation tool with no output schema and sparse annotations, the description omits what the call returns and how a created vehicle is subsequently referenced. An agent can construct the request from the schema but learns nothing about the result it will get back.

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% across 15 parameters, so the schema already documents each field's meaning and the two enums. The description adds only the optional customer linkage, which is a modest supplement over the schema baseline.

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 ('Create a vehicle') and clarifies that the vehicle may optionally be attached to a customer. It does not explicitly distinguish itself from siblings like shopmonkey_update_order or shopmonkey_get_vehicle, though the create semantics are self-evident.

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?

No guidance on when to use this tool versus alternatives, nor prerequisites such as needing an existing customer before attaching one. The phrase 'optionally attached to a customer' hints at the customerId relationship but gives no conditions or exclusions.

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