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

Annotations already declare readOnly, idempotent and openWorld, so the safety profile is covered structurally. The description adds that the data is a reference set 'known to VanAuto' and that results carry listing counts, but it says nothing about result volume, truncation at the limit boundary, or the fact that counts are live. Adequate but not rich.

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 sentences, no filler, with the core scope stated first and the intended workflow second. Every clause earns its place.

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 two-parameter, no-output-schema lookup tool with full annotation coverage, the description conveys purpose, return content (makes plus counts), and usage intent. The only gap is that nothing hints at pagination or result-set size against the 250 maximum, which is minor here.

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 baseline is 3: both 'limit' and 'query' are already documented in the schema, and the description adds no syntax, defaults, or filtering nuance beyond it. The example filter in the schema ('ben' for Benimar) is not echoed or extended in the description.

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 gives a specific verb+resource ('List camper makes (brands)') and enriches it with what each entry contains (active sale and rental listing counts). It is clearly distinguishable from siblings like search_campers or get_camper_details, though it never explicitly names a sibling to contrast against.

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?

'Use this to resolve a brand name before searching' establishes a clear context for invocation and implicitly points at the search tools as the downstream step. No explicit when-not-to-use or named alternative is given, so it stops short of a 5.

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