register_domain

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

With no annotations, the description should disclose behavior beyond schema. It only restates parameter limits and optionality, but omits critical details: whether availability is checked, payment side effects, expected outcomes, sync/async nature, or authentication needs.

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?

Two sentences, no redundancy. The first sentence states the core action, the second adds parameter details. Efficient and front-loaded.

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 complex mutation tool (domain registration likely involving payment and availability checks), the description is insufficient. It lacks return value, error conditions, prerequisites, and steps needed after registration. Output schema is absent, increasing the need for description 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?

Schema coverage is 100%, so baseline 3. The description adds no new meaning beyond what schema already provides: 'Duration is in years (1-10)' repeats schema constraints, and 'Optionally specify...' restates optional fields.

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 states the action ('register') and the resource ('a new domain name'). It distinguishes from siblings like 'bulk_register_domains' and 'renew_domain' by implying single-domain registration for new names.

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?

No guidance on when to use this tool versus alternatives (e.g., bulk_register_domains for multiple domains, transfer_domain for existing domains). No prerequisites or constraints are mentioned beyond the description.

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