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

Annotations already declare readOnly, idempotent and non-destructive, so the bar is lower. The description still adds real context beyond them: it never exposes the seller's floor, payment is a held card authorization on the seller's own account, and the site brokers no sale — trust and safety-relevant traits an agent could not infer.

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 dense sentences, front-loaded with what the tool returns before the behavioral caveats. Nothing is redundant, though the phrasing is compact enough that the key output ('the link to give the cardholder') is slightly buried mid-sentence.

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?

An output schema exists, so return values need not be described. Combined with annotations covering safety and the description covering the payment model and non-appraisal boundary, the definition is sufficient for correct invocation; only sibling routing is thin.

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?

There is a single parameter with 100% schema description coverage, so the schema fully documents the domain argument. The description adds no syntax or format detail beyond that, making the baseline 3 appropriate.

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 (quote/live price for one listed domain) plus the artifact returned (protection terms, requirements, cardholder link). The clause 'never evaluates an offer' implicitly separates it from appraise_domain and ask_domain_market, so an agent can place it without opening a schema.

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 scope ('one listed domain', pre-payment quoting) is implied, and 'never evaluates an offer' hints at where a sibling like appraise_domain belongs. However, no alternative tool is named and no explicit when/when-not condition is given, so routing is left to inference.

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