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

Annotations already cover read-only, idempotent, non-destructive behavior, and the description adds real value beyond them: missing facts render as 'not stated' and the tool deliberately names no winner, so the agent won't expect a ranking verdict.

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?

Three tight sentences, front-loaded with the count constraint and the returned fields, with no filler; the 'names no winner' caveat sits last where it belongs.

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?

No output schema exists, and the description effectively documents the return contents (hours, weekend sales/service, doc fee, options, Everroad Score with basis) plus missing-data behavior, so an agent can call it confidently; only the provenance of slugs is unstated.

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?

With 0% schema description coverage the description carries the burden, and it does explain key slug semantics: count must be 2-5 and order is preserved in the output. It doesn't say where slugs come from (presumably find_dealers), a minor gap.

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 ('Facts for 2 to 5 dealers side by side') and enumerates exactly which facts are returned, which clearly separates it from single-dealer siblings such as dealer_facts and dealer_score.

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 '2 to 5 dealers' bound and 'in the order given' imply the comparing-multiple-dealers use case, but the description never names an alternative (e.g. use dealer_facts for one dealer) or states when not to use it.

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