InstaDomain

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

With no annotations provided, the description carries full disclosure burden. It explains the x402 protocol mechanics (HTTP 402 response, automatic USDC settlement on Base), WHOIS privacy defaults, legal ownership transfer via registrant details, and post-payment polling requirements. Minor gap: doesn't explicitly characterize the operation as destructive/mutating, though 'purchase' implies this.

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?

Well-structured with logical flow: purpose → process steps → requirements → contact explanation → parameters → returns. Front-loaded with critical context. Slightly verbose but justified by the novel x402 protocol complexity and 11 parameters requiring documentation.

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?

Given 11 parameters, 0% schema coverage, no annotations, and a novel crypto payment protocol, the description is remarkably complete. It documents the return dict contents (order_id, pay_url, price_usdc, etc.), prerequisites, legal implications, and polling workflow. No gaps remain for safe invocation.

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 has 0% description coverage, but the description compensates perfectly via an 'Args:' section documenting all 11 parameters with specific formats (e.g., phone: '+1.5551234567', country: '2-letter ISO country code', org_name: 'optional, leave empty for individuals'). Fully compensates for the schema deficiency.

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 explicitly states 'Start the purchase flow for a domain using USDC crypto payment (x402 protocol)' — specific verb (start/purchase), resource (domain), and payment method (USDC/x402) that clearly distinguishes it from the sibling 'buy_domain' tool (presumably for fiat payments).

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?

Provides explicit prerequisites: 'IMPORTANT: Before calling this tool, you MUST first call check_domain to get the price and confirm it with the user.' Also details the 2-step process (get order_id/pay_url, then HTTP GET to pay_url) and requires 'x402-compatible HTTP client with a funded USDC wallet on Base.'

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