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

Annotations already declare readOnlyHint=true, idempotentHint=true, openWorldHint=false, and destructiveHint=false, so the safety profile is covered. The description adds useful domain context, including the Utah rule that dealers may not sell on both Saturday and Sunday, but it does not describe return ordering, pagination, or error behavior.

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 two sentences, front-loaded with the main resource and scope, and each sentence adds useful information without repetition. There is no 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 a simple read-only lookup with two optional filters and no output schema, the description is largely complete: it states what is returned, the optional filters, and a relevant domain constraint. The main minor gap is that it does not explain what the totals contain or how the results are structured.

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 0%, so the description must carry parameter meaning. It identifies both city and market as optional filters, clarifies that the result can be limited to one county market or city, and gives an example market value such as "utah-county".

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 states a specific resource and scope: Saturday and Sunday sales and service hours for dealers, optionally filtered by county market or city, plus totals. An agent can tell this is a weekend-hours lookup rather than a general dealer search or comparison.

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 description implies usage by saying the result can be optionally scoped to one county market or city, but it does not explicitly say when to use this tool instead of siblings like dealer_facts or compare_dealers. There are no when-not conditions or named alternatives.

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