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

No annotations are provided, so the description carries the full burden. It does disclose meaningful behavior beyond structure: a per-call price of $0.003 USDC paid via x402 on Base, which signals a paid, likely live network operation. However it says nothing about rate limits, failure modes, permission/auth requirements for the x402 payment, or response format.

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?

Two dense sentences with zero waste; the returned-data inventory is front-loaded, and the pricing caveat is a compact trailing sentence. Every clause 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 one-parameter lookup with no output schema and no annotations, the description enumerates exactly which data categories come back, which is the key thing an agent needs. It stops short of describing return shape, error behavior, or payment mechanics for x402, but is otherwise sufficient to call correctly.

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 single 'domain' parameter is fully documented in the schema (100% coverage) with an example, so the schema does the heavy lifting. The description adds no extra meaning about accepted formats, IDN support, or TLD restrictions, 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?

The description states exactly what the tool returns: RDAP registration data (registrar, created, updated, expires, status codes, nameservers, DNSSEC) plus DNS A/AAAA/MX/NS/TXT/CAA records. The verb+resource are unambiguous, though it does not explicitly contrast itself with siblings like domainaudit_whois_bulk or domainaudit_audit, leaving an agent to infer the difference.

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 — an agent can deduce this is a one-domain, all-in-one lookup, but there is no explicit when-to-use statement, no conditions, and no named alternative (e.g., when to prefer domainaudit_whois_bulk for many domains). The per-call price does hint at cost consideration per invocation.

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