registrantVerificationStatus

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. The verb 'List' implies a read-only operation and the description states exactly what data is returned; however, it does not explicitly mention side-effect absence, authorization requirements, or any additional behavioral traits. This is adequate for a simple zero-parameter read operation but not richly transparent.

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 a single sentence that is front-loaded with the action and resource, followed by a relevant reference link. There is no redundant phrasing or unnecessary detail, and every word contributes to understanding the tool's purpose.

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 zero-parameter read-only tool with no output schema, the description adequately covers what the tool does and what it returns. It tells the agent that the result includes registrant email addresses and their ICANN-verified status, which is sufficient for basic invocation. It does not explain edge cases or additional API quirks, but the simplicity of the tool limits the need for more context.

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 tool has zero parameters and the schema shows an empty properties object, so there are no parameter semantics to document. The description appropriately focuses on what the tool returns rather than input handling, matching the baseline for a no-parameter tool.

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 uses a specific verb ('List') and a specific resource ('registrant email addresses and whether they are ICANN-verified'), which clearly identifies the tool's purpose. It is distinct from sibling tools like emailVerification because it is a read-only listing operation rather than an action that sends or modifies email verification.

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 provides no guidance on when to use this tool versus alternatives such as emailVerification, getDomainInfo, or contactList. It does not state any exclusions, prerequisites, or conditions that would help an agent choose this tool over related ones. The usage context is merely implied by the tool's name and description.

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