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

No functional annotations beyond a title, so the description carries the burden and does deliver a high-value behavioral warning the schema never states: unknown filter values are silently ignored and the agent will get EVERYTHING back, a silent over-broad-result failure mode. It does not disclose pagination limits, total counts, or what the response payload looks like.

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?

Four short sentences, front-loaded with the resource and scope, then the combinability rule, then the silent-ignore hazard, then the recovery path. Every sentence changes agent behavior; nothing is filler.

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 an 18-parameter, fully-optional search with no output schema and no annotations, the description covers the main failure mode and the sibling lookup path. The remaining gap is the result envelope: with no output schema, an agent still does not know whether totals, facets, or pagination metadata come back, or what pageSize interacts with.

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 coverage is 100%, so the baseline would be 3, but the description adds cross-cutting parameter knowledge the schema lacks: filter values are lowercase English codes and invalid codes fail silently rather than erroring. That directly changes how an agent validates and constructs any of the 18 filter params.

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 ("Search used vehicles in the De Autofinancier inventory"), naming the exact inventory domain. It also names the sibling tool list_filter_values as the supporting lookup, so an agent can place it relative to its only sibling without opening any 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?

Gives clear operating context: all filters optional and freely combinable, and an explicit directive to call list_filter_values first when codes are uncertain. It stops short of stating when-not to use this tool (e.g. retrieving a single vehicle by id or listing all inventory with no pagination), so it is strong but not exhaustive.

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