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

With no annotations, the description carries the full behavioral burden, yet it discloses only the audit's subject areas. It says nothing about whether the call is read-only, whether it hits live DNS/WHOIS sources, whether it requires an API key or payment, how long it takes, or what the result looks like — all material for a security-audit call.

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 short and front-loaded, which is good, but roughly half of it is redundant name-restatement ('Domain Audit: Domain audit —'). The three facet words are the only content that earns its place.

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 two-parameter tool with zero schema documentation, no annotations, and no output schema, the description supplies almost none of the missing context — not the meaning of 'input' vs 'domain', not the audit scope, not the failure modes. The gaps in the structured data are left entirely uncovered.

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% and the description never mentions either parameter. Worse, the schema exposes both 'input' and 'domain' as optional strings with no documented relationship, so the agent has no basis for deciding which to populate or whether they are alternatives.

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 does name a verb (audit) and a resource (domain) and enumerates three facets — ownership, DNS, security — so the purpose is inferable. However, the leading 'Domain Audit: Domain audit —' simply restates the tool name, and it draws no distinction from the many near-identical siblings (x402-domain-report, x402-domain-intel, x402-domain-due-diligence, x402-whois, x402-dns-all), leaving the agent unable to tell which domain tool to pick.

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?

There is no when-to-use, when-not-to-use, or prerequisite guidance. Given the crowded domain/DNS/whois namespace this tool lives in, an explicit routing hint (e.g. 'use this instead of x402-domain-intel when you need an aggregate ownership+DNS+security verdict') is exactly what is missing.

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