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

With no annotations provided, the description carries the full disclosure burden. It explicitly states that authentication is required and discloses the non-obvious behavior that missing DNS zones are initialized automatically. It does not describe response format, propagation time, or duplicate-record handling, but the key side effects and prerequisites are surfaced.

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 efficient and front-loaded with the core purpose. The parameter guidance is compact and organized, with required vs optional clearly separated, and every sentence adds useful information without 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?

Given the lack of annotations and output schema, the description covers the essential invocation details: authentication, parameter values, defaults, and automatic zone initialization. It falls slightly short by not describing the shape of the response or how to interpret the result, but it is sufficient for a competent agent to make a correct call in most cases.

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 description coverage is only 14%, so the description must compensate. It does by explaining domain, name, type, content, ttl, and priority with examples and defaults. However, the 'content' parameter is only described as 'record value,' leaving the type-specific format ambiguous for MX, SRV, TXT, and other record types.

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?

States a specific action and resource: 'Create a new DNS record for a domain.' This clearly distinguishes the tool from siblings such as updateDnsRecord, deleteDnsRecord, getDnsRecord, and listDnsRecords. The type list further clarifies the exact scope of records it can create.

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 gives clear invocation context, including required vs optional parameters and the automatic zone initialization for newly registered domains, which implicitly tells users they do not need to call initializeDnsZone first. It does not explicitly mention when to prefer an alternative like updateDnsRecord, but the context is strong enough for most routing decisions.

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