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

No annotations are provided, so the description must carry the full behavioral burden. It explicitly discloses the default merge behavior, collision policy (source wins), and the replace=true mode for an exact mirror. It does not cover potential side effects like propagation or reversibility, but the core behavioral nuances are well addressed.

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 two sentences long, front-loaded with the core purpose, and efficiently packs in the default behavior and the replace flag. Every word earns its place.

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 moderate-complexity tool with no output schema and no annotations, the description provides sufficient context: it explains the action, the default and alternative behaviors, and gives an example. It does not explain return values, but this is not required without an output schema.

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 the baseline is 3. The description adds a useful example of record types (A/CNAME/MX) and reiterates the merge/replace semantics, but these are already captured in the schema. No significant new parameter-related meaning is provided beyond what the schema offers.

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 uses a specific verb ('Copy'), identifies the resource ('DNS setup of one domain you own'), and provides a concrete example (brand.com → brand.dev). It clearly distinguishes itself from sibling DNS tools like set_dns or snapshot_dns.

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 clearly conveys the context for use (copying DNS between two owned domains) and defines the default merge behavior. It does not explicitly exclude alternatives or name sibling tools, but the use case is unambiguous.

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