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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds a useful non-mutation guarantee ('does not purchase a test') and notes the deliverable is written usability findings, but says nothing about latency, cost implications, or what is returned for the queue check.

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 short sentences, front-loaded with the information facets, followed by a quick explanation of the service and a non-purchase caveat. Efficient, with only mild overlap between the first and third sentences.

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 zero-parameter read tool with no output schema, the description lists the information an agent gets back (price, scope, payment readiness, queue availability) and confirms it is non-destructive. Only the return shape for the queue/waitlist facet is left unspecified, which is minor given the annotations.

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 the baseline is 4; there is no parameter semantics for the description to clarify or obscure.

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 ('Check') and enumerates the resource facets it retrieves: price, scope, payment readiness, and queue availability. It also implicitly separates itself from write-path siblings by noting it 'does not purchase a test', though it does not name an alternative explicitly.

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 - check this before committing to a purchase - and the single explicit exclusion ('This does not purchase a test') guards against confusing it with get_checkout or request_test, but no sibling is named and no positive when-to-use condition is stated.

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