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

Annotations declare readOnlyHint=false and destructiveHint=true, but the description adds no behavioral context. It does not disclose that updating nameservers/handles likely replaces existing values, may affect DNS resolution, or requires specific domain state. The description merely repeats the action without consequences.

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 repetitive, with 'Update a specific domain' stated twice. It could have been one sentence. The redundancy adds no value and wastes space.

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 nested schema, destructive annotation, and lack of output schema, the description is incomplete. It does not mention expected return values, error conditions, side effects, or any workflow context. For a complex mutation tool, this is insufficient.

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 0%, so the description must compensate. It mentions 'nameservers' and 'handles' but does not explain the format of handles (string), the nested structure of nameservers (array of objects with hostname, ipV4, ipV6), or the required parameters like domain and x-request-id. This leaves users guessing about parameter details.

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 'Update a specific domain - Update nameservers and handles for a specific domain' clearly identifies a specific verb (update), resource (domain), and scope (nameservers and handles). This distinguishes it from siblings like updateHandle (updates a handle object) and updateDnsZoneRecord (updates DNS zone records).

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 explicit guidance on when to use this tool versus alternatives. It does not mention exclusions, prerequisites, or situations where other tools (e.g., updateHandle, updateDnsZoneRecord) would be more appropriate. The usage context is only implied by the description.

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