registerDomain

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

With no annotations provided, the description carries the burden of behavioral disclosure. It does disclose the critical side effect that funds are spent and mentions the payment method, which is valuable. It does not mention reversibility, failure behavior, output format, or any prerequisite conditions beyond the contact_id preference.

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 very brief and front-loaded: the core action is stated first, followed by two high-value operational hints and a reference link. Every sentence earns its place with no unnecessary filler.

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?

Given the tool's 40 parameters, high schema coverage, and no output schema or annotations, the description provides a useful high-level orientation but omits several contextual details an agent would need after invocation, such as expected response shape, failure modes, or whether registration is immediate. The link to the API reference partially compensates but is not self-contained.

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 coverage is 100%, so the baseline is 3. The description adds meaningful guidance beyond the schema by instructing the agent to prefer an existing contact_id, reducing ambiguity about whether to supply the many address fields. The funds/payment_id note also adds practical parameter-selection context.

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 opens with a clear verb and resource: 'Register a domain.' It distinguishes the action from related sibling tools like renewDomain and transferDomain, though it does not explicitly contrast with the similarly named registerDomainDrop.

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?

It provides useful guidance by warning that the operation spends account funds or requires payment_id, and by recommending use of an existing contact_id. However, it does not explicitly state when to choose this tool over alternatives like checkRegisterAvailability or registerDomainDrop.

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