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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, covering the safety profile. The description adds only the notion of 'supported vehicle' and 'canonical detail endpoint,' but does not disclose return format, error handling, or what 'supported' means. This is acceptable but not enriching.

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?

The description is a single, compact sentence with the verb and resource front-loaded. There is no filler or redundant elaboration, making it highly scannable.

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 get-by-identifier tool with full schema coverage and strong annotations, the description is nearly complete. The only notable omission is the response payload or not-found behavior, but the lack of an output schema and the tool's simplicity make this a minor gap.

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%; the identifier parameter already has a detailed description matching the tool description almost verbatim. The description adds no new meaning beyond rephrasing the schema, so it stays at the 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?

The description states a specific verb (retrieve), a specific resource (one supported vehicle record), and the accepted identifier types (VIN or slug_vin). This clearly differentiates from siblings like search_auction_vehicles or get_vehicle_history, which serve different retrieval purposes.

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 intended usage is implied: use this tool when you have a VIN or slug_vin and need the canonical single vehicle record. However, it does not explicitly mention alternatives or exclusions, leaving the agent to infer when to choose get_vehicle over sibling tools.

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