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

No annotations are provided, so the description carries the burden, and it discloses two high-value traits: the per-call price ($0.03 USDC) and the payment rail (x402 on Base, eip155:8453). That is exactly the kind of behavioral fact an agent needs before invoking a paid tool. It still omits error/failure behavior and latency, keeping it at a 4 rather than 5.

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?

Compact and front-loaded: role ('Lead tool'), scope, fields, then payment details. Every clause carries information with no filler. Minor density of the payment string in the same sentence slightly reduces readability but nothing is wasted.

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 single-parameter, no-output-schema tool with no annotations, the description covers purpose, returned fields, source attribution, and cost/chain. The main missing piece is explicit domain format and failure/payment-failure behavior, which is reasonable to omit given the simple schema.

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 single parameter 'domain' is undocumented in the schema, but the description implies its meaning by framing the tool as a 'company profile for a domain.' It adds some semantic grounding but never states format (bare domain vs. URL) or validation expectations, so it only partially compensates for the coverage gap.

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+resource ('company profile for a domain') and enumerates the exact fields returned (legal name, domain age, registrar, LEI, socials). It is clearly distinguished from the siblings (batch_meta, page_meta, readable_text, link_graph), which are page/content-oriented rather than company-record oriented.

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?

Labels itself 'Lead tool,' implying it should be tried first, and gives the cost/chain for the call, which is useful context. But it never states when-not to use it or how to choose among the sibling tools, so usage selection is only implied.

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