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

The description lacks explicit behavioral disclosures beyond the basic 'get' operation. While it mentions a cost per call (1 Credit), it does not elaborate on side effects, permissions, rate limits, or error handling, which are critical for a tool without annotations.

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 concise, consisting of only one sentence, but it awkwardly merges the core functionality with billing information, which could be better separated. The structure lacks clear segmentation, making it less readable than it could be.

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?

The description fails to provide essential context such as the expected return value, potential limitations, or how the tool fits into a larger workflow. With no output schema and minimal details, it is insufficient for a user to understand the tool's full behavior.

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 lists a single parameter 'domain' without any description, and the tool description does not clarify its meaning, format, or constraints. The example 'google.com' is present in the schema but not explained, so parameter semantics are virtually undefined.

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 primary function as 'Get domain age', which is a specific verb and resource. However, the inclusion of 'Billing per call: 1 Credits' is somewhat tangential and could be confused with the core purpose, slightly reducing clarity.

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 no guidance on when to use this tool versus alternatives, nor does it mention any prerequisites or conditions for its usage. It simply states the action without contextualizing its appropriate usage.

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