Vehicle Database MCP Server

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

No annotations are provided, so the description carries full burden. It describes what information the decode returns (interior/exterior details, HEX codes, fuel economy, etc.) but doesn't mention important behavioral aspects like rate limits, authentication requirements, error conditions, or whether this is a read-only operation. For a tool with no annotations, this leaves significant gaps in understanding how it behaves.

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 reasonably concise but poorly structured. It starts with 'Premium plus VIN decode' which doesn't match the tool name 'multiple_trims', creating confusion. The information is front-loaded with feature details but lacks clear organization. The description cuts off mid-sentence ('S...'), indicating it's incomplete.

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 tool with no annotations and no output schema, the description is incomplete. It describes what information the service provides but doesn't explain the tool's specific function, how it differs from siblings, or what the output format looks like. Given the complexity implied by the tool name and the rich sibling ecosystem, this description leaves too many questions unanswered.

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%, so the schema already documents both parameters. The description doesn't add any meaningful information about the 'vin' or 'multiple' parameters beyond what the schema provides. It doesn't explain what 'multiple' means in the context of this tool or how it affects the response. Baseline 3 is appropriate when schema does the documentation work.

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 explains what 'Premium plus VIN decode' does but doesn't clearly state what the 'multiple_trims' tool specifically does. It describes a general VIN decoding service rather than explaining how this tool differs from siblings like 'by_vin', 'decode_by_vin', or 'vin_decode'. The tool name suggests something about multiple trims, but the description doesn't connect to this purpose.

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 explicit guidance on when to use this tool versus the many other VIN-related tools in the sibling list. The description mentions coverage for 1999-2023 VINs, but doesn't specify when this 'premium plus' decode should be chosen over basic decode tools or what makes it different from similar-sounding tools like 'vin_decode' or 'decode_by_vin'.

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