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buy_it_now

Purchase a domain listed on the marketplace at its fixed Buy It Now price by providing the listing ID and optional currency.

Instructions

Purchase a domain listed on the marketplace at its Buy It Now price.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
listing_idYesListing ID to purchase
currencyNoCurrency for the purchase
Behavior2/5

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

No annotations are provided, so the description must disclose behavioral traits. It states 'Purchase', indicating a write operation, but does not mention authorization requirements, rate limits, side effects, or return value.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, clear sentence with no redundant information. It is front-loaded and efficient.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The description minimally covers the tool's purpose but does not explain return values, payment process, or order status. Given no output schema, more context would be beneficial for a purchase tool.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100% (both parameters have descriptions). The description adds no extra meaning beyond what the schema provides. Baseline 3 is appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the verb 'Purchase', the resource 'domain', and the context 'marketplace at its Buy It Now price'. It differentiates from siblings like 'place_bid' and 'buy_expired_domain'.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies usage for fixed-price marketplace purchases, but lacks explicit guidance on when to use this tool versus alternatives like 'place_bid' for auctions or 'register_domain' for new registrations.

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

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