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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint, so the safety profile is covered. The description adds useful scope context by specifying 'one model year' and enumerating return contents, but does not disclose other behavioral traits such as output format, data freshness, or error behavior.

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?

A single dense sentence that front-loads the core purpose ('full published record for one model year') and then efficiently lists the return contents. There is no filler or redundant restatement of the tool name.

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?

With no output schema, the description carries the burden of explaining return values, and it enumerates the major record categories thoroughly. It could be slightly more explicit that the tool returns a single record object, but the singular 'record' and 'one model year' phrasing make this reasonably clear.

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 the id parameter already includes an example and a pointer to search_vehicles. The tool description adds no additional parameter-level meaning beyond what the schema provides, so the baseline score of 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?

The description states a specific verb and resource: retrieving the full published record for one model year, and enumerates the contained data categories. This clearly distinguishes get_vehicle from specialized siblings like check_recalls, lookup_bulletin, and lookup_trouble_code.

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 'full published record for one model year' framing implies use when comprehensive vehicle data is needed, and the id parameter schema points the agent to search_vehicles. However, the description itself gives no explicit when-to-use versus alternative guidance, such as 'use check_recalls for recalls only.'

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