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

No annotations are provided, so the description carries the full behavioral burden. It discloses the important safety trait that calling it on existing zones will not overwrite records, and clarifies that registration normally initializes the zone automatically. It does not mention authorization requirements or failure conditions, but the key non-destructive behavior is clearly stated.

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 compact and front-loaded. Each sentence adds distinct value: purpose, when it is unnecessary, when it is necessary, safety behavior, and the required parameter with an example. No filler or redundant restatement.

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 relatively simple two-parameter tool with no annotations and no output schema, the description covers the core decisions needed to invoke it correctly: what it does, when to use it vs. not, the required parameter format, and its non-destructive behavior. An agent has enough context to select and call it.

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 50%, with domain lacking a schema description. The description compensates by marking domain as required and providing a concrete example ('example.com'). The sessionKey parameter is already well documented in the schema, so the description does not need to repeat it.

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 specific verb and resource: 'Initialize (create) the DNS zone for a domain.' It clearly distinguishes this tool from related operations like createDnsRecord and registerDomain, and even states when it is not needed.

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?

Explicit usage guidance is provided: the tool is not needed after registerDomain, and should only be used for pre-existing domains without a zone, such as after a transfer or when registration opted out with initializeDnsZone:false. This leaves little ambiguity about when to invoke it.

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