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

With no annotations, the description carries the full burden of behavioral disclosure. It does disclose the $0.03 x402 payment requirement, the read-only nature, and the one-call fusion behavior. However, it does not mention possible failure modes, prerequisites, or behavior when Wikipedia or DNS data is unavailable.

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 compact and front-loaded with valuable specifics: price, payment mechanism, data sources, and single-call behavior. The second sentence is slightly awkward but still contributes context about the intended use case.

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 tool with one required parameter and no output schema, the description gives a useful high-level picture of what the result contains and what it costs. Still, it omits x_payment details, clearer alternative routing, and any note about error handling or data completeness.

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 domain parameter is documented in the schema with an example, but x_payment has no schema description and the tool description only hints at it via '$0.03 via x402'. With 50% schema description coverage and one undocumented parameter, the description does not compensate for the 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?

The description clearly identifies what the tool does: it is a company/domain enrichment connector that returns RDAP domain age and registrar, DNS email provider, and a Wikipedia company profile in one call. This specificity distinguishes it from sibling enrichment tools like b2b_lead_enrichment and wikipedia_lookup.

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?

The description implies the intended audience ('sales, research and qualification agents') and highlights that it uses free data, but it does not explicitly state when to choose this tool over alternatives such as b2b_lead_enrichment, opportunity_intelligence, or sales_qualify_lead. There is no when-not-to-use guidance.

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