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

Annotations already declare readOnly, idempotent, closed-world, non-destructive behavior, so the safety profile is covered. The description adds genuinely new behavioral detail by disclosing what comes back — explainer page URLs and the date the sources were checked — which conveys provenance and staleness without an output schema.

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 sentence with no waste, front-loading the subject matter and then the return contents. Every clause carries information the agent cannot get from structured fields.

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 compensates by stating what the response contains (URLs and a checked date), and the zero-parameter schema plus annotations make the invocation profile unambiguous. A brief note on scope (e.g., that this is reference material, not advice, or how it relates to weekend_hours) would complete it.

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?

The tool takes zero parameters, so there is no parameter semantics to document; baseline 4 applies. The description correctly implies the tool is fully self-contained with no input needed.

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 names a specific subject (Utah dealer doc fee and the Saturday/Sunday selling rule) and the shape of the return (explainer URLs plus source-check date), so an agent knows exactly what it retrieves. It does not explicitly differentiate itself from the closest sibling, weekend_hours, which likely covers the practical hours question rather than the legal rule.

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?

Usage is only implied: an agent can infer it should call this when it needs legal background rather than live dealer hours, but the description never says when to prefer it or when to route to weekend_hours or dealer_facts instead. No exclusions or prerequisites are stated.

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