register_domain

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

No annotations are provided, and the description does not disclose behavioral traits. It omits safety information such as whether the action is destructive, has billing implications, requires verification, or triggers DNS propagation. The description says nothing about side effects or success/failure behavior.

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 extremely concise—a single sentence of four words. While it is front-loaded, it is too minimal and lacks detail. It is not verbose, but it sacrifices necessary information for brevity.

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 complexity (6 parameters, nested contact object, no output schema), the description is severely incomplete. It does not mention that registration may fail if the domain is taken, that provider must be from a predefined list, or that autoRenew and privacyProtection have defaults. The description fails to provide a complete picture of what the tool does and its 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 input schema has 83% description coverage, so most parameters are well-described in the schema itself. The description adds no additional meaning beyond the schema, but the schema already provides sufficient semantics for each parameter. Thus, the description meets the baseline expectation.

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 'Register a new domain' clearly states the verb (register) and resource (domain). It distinguishes the tool from siblings like renew_domain, transfer_domain_in, and check_availability, which have different purposes.

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. It does not mention prerequisites (e.g., checking availability first), nor does it explain when not to use it. There is no mention of related tools like check_availability or transfer_domain_in.

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