Set WHOIS profile as default

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

Annotations already declare readOnlyHint=false, idempotentHint=true, and destructiveHint=true, so the description doesn't need to restate these. It adds useful behavioral context by explaining that the default profile is pre-selected for the TLD during new domain registrations, which goes beyond a mere action statement. No contradiction with annotations is present.

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 three precise sentences, front-loaded with the main action and followed by a brief behavioral explanation and usage motivation. Every sentence contributes value, with no filler or redundancy.

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 simple one-parameter mutation tool with no output schema and well-covered annotations, the description is complete. It explains what the tool does, the effect after execution, and why an agent would call it. No critical details are missing.

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%: the only parameter whoisId is fully described as 'WHOIS ID' in the schema. The description adds no extra meaning to the parameter. Since the schema already documents it well, the baseline score of 3 applies.

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: 'Set WHOIS contact profile as default.' It also explains the implication that the default profile is 'pre-selected for the TLD it belongs to when registering new domains.' This distinguishes it from related tools like domains_unsetDefaultWHOISProfileV1 and domains_changeWHOISProfileForDomainV1.

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 a clear usage rationale: 'Use this endpoint to avoid picking contact information for every registration.' This tells an agent when to use the tool. However, it doesn't explicitly mention when not to use it or point to alternatives (e.g., unset). Still, the guidance is clear enough for typical scenarios.

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