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

The description aligns with the readOnlyHint annotation by stating 'retrieve', and adds the API endpoint for transparency. However, it does not disclose other behavioral aspects like authentication requirements, rate limits, or potential errors, which is acceptable given the annotation's coverage. The added API info is mildly helpful but not extensive.

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 covering purpose and API reference, front-loaded with the action. No unnecessary words, every sentence adds value. Perfectly concise for a simple tool.

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 tool's simplicity (one parameter, no output schema, readOnly annotation), the description adequately explains what the tool does and what prices it retrieves (registration, renewal, transfer). It lacks details on the return format, but for a retrieval tool the information is sufficient. Slightly above average completeness.

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?

The schema already describes the single parameter 'domain' with an example. The description indirectly references it by stating 'for a domain' but does not add extra semantic meaning beyond the schema. With 100% schema coverage, the baseline is 3, and the description does not improve it further.

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 verb 'retrieve' and specific resources (registration, renewal, transfer prices for a domain). It differs from sibling tools like 'dnsimple_check_domain' which likely checks availability, and 'dnsimple_get_domain' which retrieves domain info, so the purpose is distinct.

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 clear context for using the tool (when you need domain prices). However, it does not explicitly mention when not to use it or suggest alternatives, though the sibling tools infer different use cases. The phrase 'Retrieve the registration, renewal, and transfer prices' sets a clear scope.

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